Filed Pursuant to Rule 424(b)(3)
                                                Registration File No. 333-130244



               SPACEDEV                         STARSYS RESEARCH              




                JOINT PROXY STATEMENT/PROSPECTUS SUPPLEMENT NO. 1
                       (To joint proxy statement/prospectus
                            dated December 29, 2005)

                                12,357,143 SHARES

                                 SPACEDEV, INC.

                    COMMON STOCK, PAR VALUE $0.001 PER SHARE


     This  joint  proxy statement/prospectus supplement no. 1, which we refer to
as this supplement, updates and supplements our joint proxy statement/prospectus
dated  December  29, 2005 which forms part of our Registration Statement on Form
S-4  (Registration  File  No. 333-130244).  The joint proxy statement/prospectus
relates  to  the  special  meetings  of  the  shareholders of SpaceDev, Inc. and
Starsys  Research Corporation and the proposed merger of Starsys with and into a
wholly-owned  subsidiary of SpaceDev, which we refer to as the merger, including
the issuance of shares of SpaceDev common stock to Starsys shareholders pursuant
to the related agreement and plan of merger and reorganization.  This supplement
is  being  sent  to  shareholders  of SpaceDev and Starsys to advise them of the
financing  that  SpaceDev  recently consummated and to update the description of
appraisal  rights  under  California  law.

     You  should  read  this  supplement  in  conjunction  with  the joint proxy
statement/prospectus  identified  above.   This   supplement   is  qualified  by
reference to the joint proxy statement/prospectus, except to the extent that the
information  in  this supplement updates or supersedes the information contained
in  the  joint  proxy  statement/prospectus.

     The  proposed  merger  involves risks.  WE ENCOURAGE YOU TO READ THE ENTIRE
JOINT PROXY STATEMENT/PROSPECTUS AND THIS SUPPLEMENT CAREFULLY AND WE ESPECIALLY
ENCOURAGE  YOU  TO READ THE SECTION ENTITLED "RISK FACTORS" BEGINNING ON PAGE 13
OF  THE  JOINT  PROXY STATEMENT/PROSPECTUS AND THE SUPPLEMENTAL SECTION ENTITLED
"SUPPLEMENTAL  RISK  FACTORS"  BEGINNING  ON  PAGE  2  OF  THIS  SUPPLEMENT.

     NEITHER  THE  SECURITIES  AND  EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE SPACEDEV COMMON STOCK TO BE ISSUED
PURSUANT  TO  THE  MERGER  OR  PASSED UPON THE ADEQUACY OR ACCURACY OF THE JOINT
PROXY  STATEMENT/PROSPECTUS  OR  THIS  SUPPLEMENT.  ANY  REPRESENTATION  TO  THE
CONTRARY  IS  A  CRIMINAL  OFFENSE.


     The  Boards  of  Directors  of  both  SpaceDev and Starsys enthusiastically
support  this reorganization, and recommend that you vote FOR the merger and the
other  proposals.



    This joint proxy statement/prospectus supplement no. 1 is dated January 23,
                                      2006.


                                     PAGE 1


                            SUPPLEMENTAL RISK FACTORS

     The  merger  involves  a  high  degree  of  risk.  In addition to the risks
referenced  or  described in the joint proxy statement/prospectus dated December
29,  2005  and  in  SpaceDev's  reports  filed  with the Securities and Exchange
Commission,  you should carefully consider the risks described below relating to
the merger.  If any of these risks actually materialize, the business, financial
condition  or  results of operations of SpaceDev and/or Starsys may be seriously
harmed.  In  such  case,  the market price of SpaceDev common stock may decline,
and  you  may  lose  all  or  part  of  your  investment.

RISKS  RELATED  TO  THE  COMBINED  COMPANY  FOLLOWING  THE  MERGER

EACH  OF  SPACEDEV  AND STARSYS HAVE EXPERIENCED LOSSES FROM OPERATIONS IN PRIOR
PERIODS  AND  HAVE  BEEN  REQUIRED TO SEEK ADDITIONAL FINANCING TO SUPPORT THEIR
BUSINESSES.

     In prior years, both SpaceDev and Starsys have experienced operating losses
and,  in some periods, revenues from operations have not been sufficient to fund
their  respective  operations.  On a pro forma basis, the combined company would
have  had  a  net loss from operations of $4,962,858 for the year ended December
31, 2004 and $955,631 for the nine months ended September 30, 2005, assuming the
merger  had  occurred  on January 1, 2004. See "Unaudited Pro Forma Consolidated
Financial  Statements"  beginning  on  page  89  of  the  joint proxy statement/
prospectus.  The  success  of  the  combined company's business depends upon our
ability  to  generate  revenue  from  existing  contracts,  to  execute programs
cost-effectively, to attract and complete successfully additional government and
commercial  contracts,  and additional financing. In the past, both SpaceDev and
Starsys have relied upon cash from financing activities to fund part of the cash
requirements  of  their  respective  businesses.  If  we  are in need of further
financing,  we  may be unable to obtain such financing or contracts as needed or
on  terms  favorable  or acceptable to us. The likelihood of our success must be
considered  in  light  of  the  expenses,  difficulties  and  delays  frequently
encountered  in  connection  with  developing  businesses,   those  historically
encountered  by  us,  the  competitive  environment  in which we operate and the
restrictions  under  which  SpaceDev  currently   operations.   In   particular,
SpaceDev's  Series  D-1  Preferred  Stock prohibits SpaceDev or its subsidiaries
from  incurring  indebtedness,  including  under  SpaceDev's  revolving   credit
facility  with  Laurus Master Fund Ltd., except for some limited exceptions, and
places  material  restrictions  on SpaceDev's ability to raise cash in an equity
financing, without the consent of the holders of the Series D-1 Preferred Stock.
Debt  financing,  if  available, would increase our interest expense, reduce our
net  operating  results,  and  could include covenants that are more restrictive
than  those  in  our current financings, including limitations on the payment of
dividends  and  on the incurrence of additional debt. The issuance of additional
equity  could  be  dilutive  to  SpaceDev's  existing  stockholders.

SPACEDEV  COMMON  SHAREHOLDERS,   INCLUDING  STARSYS  SHAREHOLDERS  WHO  RECEIVE
SPACEDEV  COMMON  STOCK IN THE MERGER, WILL EXPERIENCE DILUTION IF OUR PREFERRED
STOCK  IS  CONVERTED  OR  OUR  OUTSTANDING  WARRANTS  AND OPTIONS ARE EXERCISED.

     As of January 13, 2006, following the financing described under the heading
"Series  D  Preferred  Stock  Financing"  below,  SpaceDev is obligated to issue
7,983,994  shares  of  SpaceDev  common  stock  if all of SpaceDev's outstanding
warrants  are exercised and outstanding shares of preferred stock converted.  In
addition,  as  of  January  13,  2006, SpaceDev has outstanding stock options to
purchase  an aggregate of 10,337,266 shares of SpaceDev common stock.  The total
number  of  shares  issuable  upon  the  exercise  of currently vested warrants,
options  and preferred stock (18,321,260 shares) represents approximately 74% of
SpaceDev's issued and outstanding shares of common stock as of January 13, 2006.
In  addition,  SpaceDev  has  agreed  in  the  merger  agreement  to issue up to
5,357,143  shares at the closing of the merger as payment of Starsys transaction
expenses  and  to  Starsys  shareholders,  up to 7,000,000 shares as performance
consideration  and  up  to  1,853,571  shares as options under SpaceDev's equity
incentive plan to post-merger executives, managers, employees and consultants of
Starsys.  In  addition,  in  connection  with  the  financing referred to above,
SpaceDev  issued  rights to purchase 2,000 shares of convertible preferred stock
and common stock warrants which, if purchased for an aggregate purchase price of
$2,000,000,  would be exercisable and convertible into up to 1,792,181 shares of
SpaceDev  common  stock.

SPACEDEV  HAS  NOT  PAID  DIVIDENDS ON ITS COMMON STOCK IN THE PAST AND DOES NOT
ANTICIPATE  PAYING  DIVIDENDS  ON  ITS  COMMON  STOCK IN THE FORESEEABLE FUTURE.


                                     PAGE 2


     SpaceDev  has  not paid common stock dividends since its inception and does
not  anticipate  paying dividends in the foreseeable future.  SpaceDev's current
business plan provides for the reinvestment of earnings in an effort to complete
development  of our technologies and products, with the goal of increasing sales
and long-term profitability and value.  In addition, Chapter 5 of the California
General Corporation Law, SpaceDev's revolving credit facility with Laurus Master
Fund  Ltd.  and  the  terms  of SpaceDev's outstanding preferred stock currently
restrict  or entirely prohibit the ability of SpaceDev to pay dividends or other
distributions,  or  to  repurchase,  shares  of  its  common  stock.  Any  other
financing  arrangement   that   SpaceDev  may  enter  into  in  the  future  may
additionally  restrict  or  prohibit  paying  dividends  or distributions on, or
repurchasing,  shares  of its common stock.  In addition, SpaceDev currently has
outstanding shares of preferred stock having an aggregate liquidation preference
of  approximately $7.63 million, which shares would receive preferential payment
ahead  of  any dividends or distributions on any shares of SpaceDev common stock
upon  the  liquidation  or  dissolution  of  SpaceDev.

SPACEDEV  MAY  BE  UNABLE  TO  COMPLY  WITH RESTRICTIONS IMPOSED BY ITS SENIOR D
PREFERRED  STOCK,  INCLUDING  FINANCING  RESTRICTIONS,  WHICH  COULD RESULT IN A
DEFAULT  UNDER  THEIR  TERMS.

     SpaceDev's  Series  D-1 Preferred Stock financing facility imposes a number
of  restrictions  on  SpaceDev  for  so long as any shares of Series D Preferred
Stock are outstanding, including financing restrictions.  The Series D Preferred
Stock contains covenants that limit the ability of SpaceDev or its subsidiaries:
to  incur  indebtedness, including under the Laurus Master Fund revolving credit
facility,  except  for indebtedness related to project financing and synergistic
acquisitions;  to  issue  preferred stock which ranks pari passu with the Series
D-1  Preferred  Stock,  except  for  related  series of Series D Preferred Stock
contemplated  by  the  financing; to issue any variable-priced securities; or to
issue  any  securities  convertible,  exercisable  or  exchangeable for SpaceDev
common  stock  at  a  price  per  share or rate which may change over time.  The
Series  D  Preferred Stock also grants preemptive rights to the investors in the
Series D Preferred Stock financing to participate in future financings until the
first anniversary of the closing date of the Series D Preferred Stock financing,
and  prohibits SpaceDev from issuing any shares of its common stock for a period
of  at least 6 months after the Series D Preferred Stock financing, except under
specified  conditions  intended  to ensure the terms are no less favorable to us
than  the  terms of this financing.  The Series D Preferred Stock also prohibits
SpaceDev  from creating or suffering to exist any lien on SpaceDev's property or
the  property  of  any  of its subsidiaries, including Starsys after the merger,
other  than  for specified permitted liens.  A failure to comply with any of the
foregoing  or  other  covenants  could  result  in  a triggering event under the
preferred  stock,  which could require SpaceDev to redeem the preferred stock at
130%  or  more  of  their  original  purchase  price.


RISKS  RELATED  TO  THE  MERGER

A  SUBSTANTIAL  NUMBER  OF  SPACEDEV  SHAREHOLDERS  MAY EXERCISE THEIR APPRAISAL
RIGHTS  UNDER  CALIFORNIA  LAW.

     The  shares  of  SpaceDev  common  stock  will  not be listed on a national
securities  exchange  or  the  NASDAQ  National Market System at or prior to the
merger.  SpaceDev  shareholders will therefore have appraisal rights with regard
to  shares of common stock not voted in favor of the merger and merger agreement
under  the  California  General  Corporation Law.  Under the General Corporation
Law,  a shareholder who does not vote shares in favor of the merger and complies
with  the  requirements of Chapter 13 of the General Corporation Law may require
SpaceDev  to  purchase  those dissenting shares at their fair market value as of
the  day  before  the  first  announcement of the terms of the merger.  SpaceDev
anticipates that fair market value will be $1.49 per share.  Chapter 13 requires
that  SpaceDev  or  its  transfer agent receive a shareholder demand for payment
within  30  days  of  the  mailing  by SpaceDev of notice of the approval of the
merger to the shareholder, and requires SpaceDev to mail the notice to potential
dissenting  shareholders  within  10  days  of  the  approval.

     Under  Chapter 5 of the California Corporations Code, however, SpaceDev may
pay  for  dissenting  shares  only to the extent its assets (excluding goodwill,
capitalized R&D expenses and deferred charges) exceed the sum of its liabilities
(excluding  deferred  taxes  and  other  deferred  credits)  plus  the aggregate
liquidation  preferences  of  its outstanding shares of preferred stock.  To the
extent  funds  are not lawfully available to pay dissenting shares, the right to
payment  will  be  treated  as  a  subordinated  claim  against  SpaceDev.   The
subordinated  claim will earn interest at the legal rate on judgments, currently


                                     PAGE 3


10%  per  annum.  SpaceDev  would  not be able to pay this claim, or the accrued
interest,  until  it  meets  the  financial  test  in  Chapter  5 of the General
Corporation  Law,  described  above.

     In  addition,  if  appraisal rights are exercised with respect to more than
1.5%  of the outstanding shares of SpaceDev's common stock, then either SpaceDev
or  Starsys  may  elect  not  to  consummate  the  merger.

FAILURE  TO  COMPLETE  THE MERGER COULD ADVERSELY AFFECT THE FUTURE BUSINESS AND
OPERATIONS  OF  SPACEDEV  AND  STARSYS  AS  WELL AS THE MARKET PRICE OF SPACEDEV
COMMON  STOCK.

     The  merger  is  subject  to  the  satisfaction  of  a  number  of  closing
conditions,  including  the  approval of the merger by both SpaceDev and Starsys
shareholders,  and  may  not  be  successfully completed.  In the event that the
merger  is  not  completed,  SpaceDev  may  be  subject  to  a  number of risks,
including:

-    The  price  of  SpaceDev's  common stock may decline to the extent that the
     current  market  price  of   SpaceDev's  common  stock  reflects  a  market
     assumption  that  the  merger  will  be  completed.
-    SpaceDev  could suffer the loss of customers, revenues and employees due to
     uncertainties  resulting  from  an  uncompleted  merger.
-    SpaceDev's  costs related to the merger, such as legal and accounting fees,
     must  be  paid  even  if the merger is not completed, and these costs would
     reduce  reported earnings or increase reported loss, for the period when it
     was  determined  that  the  merger  would  not  be  consummated.
-    If  the merger is not completed by March 31, 2006, each of the investors in
     the  SpaceDev  Series  D  Preferred  Stock  financing,  described under the
     caption  "Series D Preferred Stock Financing" below, will have the right to
     require  SpaceDev  to  redeem  its shares of Series D-1 Preferred Stock, as
     described  under  the caption "Series D Certificates of Designation" below.

     If the merger is not completed, Starsys may be subject to a number of risks
including:

-    Vectra Bank Colorado may foreclose on Starsys' credit facility, which could
     force  Starsys into bankruptcy and could result in Vectra owning all of the
     assets  of  Starsys.
-    Starsys  could  suffer the loss of customers, revenues and employees due to
     uncertainties  resulting  from  the  uncompleted  merger.
-    Starsys  could  have  difficulty  attracting  new  customers or maintaining
     current  customers  because  of  its  difficult  financial  situation.
-    Starsys's  costs  related to the merger, such as legal and accounting fees,
     must  be  paid  even  if  the  merger  is  not  completed.


                       SERIES D PREFERRED STOCK FINANCING

     On January 12, 2006, SpaceDev entered into a Securities Purchase Agreement,
which  we  refer  to  as  the  purchase  agreement,  with  a  limited  number of
institutional  accredited  investors,  whom  we  refer  to as the investors.  On
January  13,  2006,  SpaceDev issued and sold to these investors 5,150 shares of
its  Series  D-1  Amortizing  Convertible  Perpetual  Preferred Stock, par value
$0.0001  per  share,  which we refer to as Series D-1 Preferred Stock, under the
purchase  agreement for an aggregate purchase price of $5,150,000, or $1,000 per
share.  SpaceDev  also  issued  various  warrants  to  these investors under the
purchase agreement, as described below.  SpaceDev paid cash fees and expenses of
$119,209  to  a  finder  for  the  introduction  of  potential investors in this
financing,  and  paid  $60,000 to the lead investor's counsel for legal expenses
incurred  in  the  transaction.

     Use  of  Proceeds.   If   the   merger  contemplated  by  the  joint  proxy
statement/prospectus is consummated, the proceeds of this financing will be used
to  repay  Starsys indebtedness, to pay transaction expenses incurred by Starsys
and  by SpaceDev in connection with the merger and to pay the cash consideration
to  the Starsys shareholders.  If the merger is not completed by March 31, 2006,
each  of  the  investors  will  have the right to require SpaceDev to redeem its
shares  of  Series D-1 Preferred Stock, as described under the caption "Series D
Certificates  of  Designation" below, upon notice and surrender of its preferred
stock  warrants.  To  the  extent  investors  do  not  exercise  this right, the
proceeds  of  this  financing  will  be used by SpaceDev for working capital and
possibly  other  strategic  acquisitions.


                                     PAGE 4


     Series  D  Preferred  Stock.   The   purchase  agreement  contemplates  the
authorization  and  issuance  by SpaceDev of numerous series of preferred stock,
all  of  which  are substantially similar to the Series D-1 Preferred Stock.  We
refer  to  each  series  individually  as  Series  D-X  Preferred Stock, where X
represents  a  sequential  number,  and generically as Series D Preferred Stock.
The  relative  rights, preferences, limitations and other terms of the series of
Series  D  Preferred  Stock  are  described  below  under  the caption "Series D
Certificates  of  Designation"  below.

     Registration Rights Agreement.  Pursuant to a registration rights agreement
among  SpaceDev  and  the  investors  dated January 12, 2006, SpaceDev agreed to
prepare  and  file a registration statement covering the resale of the shares of
common stock issuable upon the conversion or redemption of, or as dividends paid
on,  the  various  series  of  Series  D  Preferred Stock, as well as the shares
issuable  upon  the  exercise  of the common stock warrants.  SpaceDev agreed to
file  this  resale  registration  statement within 30 days of the closing of the
financing.  If,  among  other  things,  (1)  SpaceDev  fails  to file the resale
registration statement by that date, or (2) the resale registration statement is
not  declared  effective  by  the  SEC  within  120  days  of the closing of the
financing, SpaceDev will be obligated to pay liquidated damages to the investors
of  1%  of the aggregate purchase price paid by the investors under the purchase
agreement  for  the first 30-day period of noncompliance and 2% of the aggregate
purchase  price  paid  by  the  investors  under the purchase agreement for each
subsequent  30-day  period  of  noncompliance.

     Additional  Investment Option.  Under the purchase agreement, from the date
of the effectiveness of the initial registration statement filed pursuant to the
registration  rights  agreement,  which we refer to as the effective date, until
the  one-year  anniversary  of  that date, if (1) on any trading day during such
period  the  volume  weighted average price of SpaceDev common stock for each of
the  20  trading  days  immediately prior to such date exceeds $1.63 and (2) the
average  daily  trading volume of SpaceDev common stock exceeds $100,000 on each
of  those  days, then SpaceDev has the option, subject to a number of additional
conditions,  to sell to the investors "units" for an aggregate purchase price of
up  to $2,000,000 (or a lesser amount to the extent the preferred stock warrants
issued  at the initial closing of the financing, which are described below, have
been  exercised  to purchase these units).  Each "unit" consists of one share of
Series  D  Preferred Stock and a common stock warrant, which entitles the holder
to  purchase up to an aggregate of 440,829 shares of SpaceDev common stock at an
exercise  price  of  $1.51  and  otherwise  has  the  same terms as the warrants
described  in  the  following paragraph.  We refer to the date on which SpaceDev
gives  notice  to the investors of its exercise of this option as the call date.

     Common  Stock  Warrants.  Certain warrants SpaceDev issued to the investors
at the closing entitle the investors to purchase up to an aggregate of 1,135,138
shares  of  SpaceDev  common stock at an exercise price of $1.51 per share.  The
warrants  are  exercisable  for  five  years  following  the date of grant.  The
warrants feature a net exercise provision, which enables the holder to choose to
exercise  the  warrant without paying cash by surrendering shares subject to the
warrant with a market value equal to the exercise price.  However, this right is
available  only  if  a  registration statement or prospectus covering the shares
subject to the warrant is not available at any time after one year from the date
of  grant.  The warrants also have anti-dilution provisions reducing the warrant
exercise  price  if  SpaceDev  issues equity securities (other than in specified
exempt  transactions)  at an effective price below the warrant exercise price to
such  lower  exercise  price.  We  refer  to  these warrants as the common stock
warrants.

     Preferred  Stock  Warrants.  SpaceDev also issued certain other warrants to
the investors at the closing, which we refer to as the preferred stock warrants.
These  warrants  entitle  the  holder  to  purchase an aggregate number of 2,000
"units",  which  are  identical  to  the "units" described above, at an exercise
price of $1,000 per unit.  The preferred stock warrants are exercisable from the
effective  date  until  the  one-year  anniversary  of  that date.  If any units
subject to the preferred stock warrants remain unsold after (1) their expiration
date  and  (2) the exercise of the additional investment option described in the
preceding  paragraph, if applicable, and any holder of a preferred stock warrant
issued  in  the  financing has exercised the warrant in full, then the preferred
stock  warrant grants that holder the right to purchase a proportionate share of
the  unsold  units.

     Other   Provisions.   The   purchase   agreement   contains   a  number  of
representations  and warranties by SpaceDev in favor of the investors as well as
a  number of covenants by SpaceDev, which are generally customary or typical for
financings  of  this  nature.  The  covenants  include:

-    an  agreement  by  SpaceDev  to  indemnify  the  investors  under specified
     circumstances;

                                     PAGE 5


-    a  grant  of  preemptive  rights  to the investors to participate in future
     SpaceDev  financings until the first anniversary of the closing date of the
     financing;
-    an agreement not to issue any shares of SpaceDev common stock or securities
     or  other rights to acquire shares of common stock until 6 months after the
     effective  date  (exclusive  of  shares being issued in the merger), except
     under  specified  conditions  intended  to  ensure  the  terms  are no less
     favorable  to  us  than  the  terms  of  this  financing;
-    an  agreement  by  SpaceDev  not  to  effect  any transaction involving the
     issuance  of  securities  convertible,   exercisable  or  exchangeable  for
     SpaceDev  common  stock  at a price per share or rate which may change over
     time,  which  we  refer  to  as a variable-rate transaction, so long as any
     shares  of  Series  D  Preferred  Stock  are  outstanding;  and
-    a provision which gives effect to any terms of the Series D Preferred Stock
     which  are  determined  to  be  unenforceable.

     Prior  Relationships  with  Investors.  Laurus  Master Fund, Ltd., which we
refer  to as Laurus, is one of the investors participating in the financing.  On
August 25, 2004, SpaceDev issued and sold to Laurus 250,000 shares of its Series
C Convertible Cumulative Preferred Stock, par value $0.001, which we refer to as
the  Series C Preferred Stock, and a warrant to purchase up to 487,000 shares of
common  stock,  as  described  in  the Form 8-K filed with the SEC on August 30,
2004.  In  addition,  on  October  31,  2005, SpaceDev issued and sold to Laurus
2,032,520  shares  of  its  common stock and a warrant to purchase an additional
450,000  shares  of  its  common  stock,  as  described in the Form 8-K filed by
SpaceDev  with  the  SEC  on  November  3,  2005.  In addition, on June 3, 2003,
SpaceDev entered into a secured revolving credit facility with Laurus and issued
warrants  to  Laurus  to  purchase  up  to an aggregate of 200,000 shares of its
common  stock,  as  described  in the Form 8-K filed by SpaceDev with the SEC on
July  18, 2003.  In June 2004, SpaceDev issued warrants to acquire 50,000 shares
of  its common stock to Laurus in connection with the revolving credit facility.
These  warrants  were  exercised in April 2005 at an exercise price of $1.06 per
share.  In August 2004, SpaceDev issued warrants to acquire an additional 50,000
shares  of  common stock to Laurus at an exercise price per share equal to $1.93
per  share in connection with the revolving credit facility.  There is currently
no  debt  outstanding  under  this  credit  facility, and the purchase agreement
prohibits  SpaceDev  from  drawing  down  on the facility.  The revolving credit
facility  with  Laurus  expires  on  June  3,  2006.

     In  connection  with this financing, Laurus consented to and waived certain
preemptive  and  other  rights  under the SpaceDev Series C Preferred Stock, the
aforementioned  agreements  and  certain  related  agreements  in respect of the
authorization and issuance of one or more series of Series D Preferred Stock and
the  other  transactions  described  in  this  supplement,   and  certain  other
transactions.  SpaceDev  paid  Laurus Capital Management, L.L.C., the manager of
Laurus,  $87,000  in connection with Laurus's delivery of the consent and $1,000
to  Laurus's  counsel  for  their  related  fees.

     A complete copy of the certificates of designation for the first two series
of Series D Preferred Stock, the Securities Purchase Agreement, the Registration
Rights  Agreement,  the  form  of Preferred Stock Warrant and the form of Common
Stock  Warrant  are filed as exhibits to the current report on Form 8-K filed by
SpaceDev  with  the  SEC  on  January  13,  2006.

     This  supplement is neither an offer to sell nor a solicitation of an offer
to  buy  shares  of  Series  D Preferred Stock, common stock warrants, preferred
stock  warrants  or common stock which may be issued upon exercise of the common
stock  warrants,  as  dividends  on  the  Series  D  Preferred Stock or upon the
conversion or redemption of the Series D Preferred Stock.  The above disclosures
are  being made pursuant to and in accordance with Rule 135 under the Securities
Act.


                  SPACEDEV SERIES D CERTIFICATES OF DESIGNATION

     On  January  11,  2006, SpaceDev filed with the Colorado Secretary of State
(1)  a  Certificate  to  Set  Forth  Designations,  Voting  Powers, Preferences,
Limitations,  Restrictions  and  Relative  Rights  of  the Series D-1 Amortizing
Convertible  Perpetual  Preferred  Stock,  $0.001  Par Value per Share, which we
refer to as the Series D-1 Certificate of Designations, and (2) a Certificate to
Set  Forth  Designations,  Voting Powers, Preferences, Limitations, Restrictions
and Relative Rights of the Series D-2 Amortizing Convertible Perpetual Preferred
Stock,  $0.001  Par  Value  per  Share,  which  we  refer  to  as the Series D-2
Certificate  of  Designations.  Under the purchase agreement described under the
caption "Series D Preferred Stock Financing" above, SpaceDev may be obligated to


                                     PAGE 6


file  additional certificates of designation which will be substantially similar
to  the  Series D-2 Certificate of Designations, except as to the issue date and
number  of  authorized  shares  in the series.  We refer to all of the foregoing
certificates  of  designations  as  the  Series  D Certificates of Designations.

     The  following  is  a  summary  of  the  relative  rights,  preferences and
limitations   of  the  SpaceDev  Series  D  Preferred  Stock.   All  series  are
substantially  the same in all respects except for the issue date and the number
of authorized shares in the series; in addition, the Series D-1 Preferred Stock,
but  no other series of Series D Preferred Stock, includes an explicit reference
to  the  amendment  of  the  SpaceDev Series C Preferred Stock, and the original
issue  date  for all series of Series D Preferred Stock is based on the original
issue  date  of  the  Series  D-1  Preferred  Stock.

     Dividend Rights.  Holders of the Series D Preferred are entitled to receive
cumulative  preferential dividends at the annual rate per share (as a percentage
of  the stated value per share, which is initially $1,000), which we refer to as
the  dividend rate, equal to LIBOR (as determined for each calendar quarter) for
the  applicable  dividend period plus 4.0% on a quarterly basis.  On the 6 month
anniversary  of  the  issue  date of any series of Series D Preferred Stock, the
dividend  rate  will be increased to 15% per annum per share with respect to any
portion  of  outstanding  shares  of  the  Series D Preferred Stock not redeemed
pursuant  to  SpaceDev's  monthly  redemption option (described in the paragraph
"Redemption Rights" below); and commencing at the beginning of the 37th month of
the issue date of the series of Series D Preferred Stock, the dividend rate will
be  increased  to  the  greater  of  LIBOR plus 10% per annum and 15% per annum.
These  dividends  may  be  paid  in cash or, at SpaceDev's option, if the equity
conditions  described  below  have  been satisfied, in shares of SpaceDev common
stock,  with  each  share  being  valued at approximately 89% of its fair market
value.

     Conversion  Rights. A holder of a share of the Series D Preferred Stock may
convert  the  share at any time into a number of shares of SpaceDev common stock
determined  by dividing the current stated value of the share (initially $1,000)
by  the  conversion  price  (initially  $1.48).  SpaceDev  also  has the option,
subject  to  certain  requirements, of forcing a conversion of the shares of the
Series  D Preferred Stock, at the same conversion rate, if, after 24 months from
the  issue  date  of the Series D-1 Preferred Stock, the volume weighted average
price  for each trading day in any 20 consecutive trading day period exceeds the
then  conversion price by 250%.  If SpaceDev fails to deliver share certificates
for  converted  shares  in a timely manner, the holder may cover a short sale of
those  shares in the market and SpaceDev will be obligated to pay the holder the
difference between the cover price and the prior sale price of those shares.  In
addition, SpaceDev has the right to force a conversion of any series of Series D
Preferred Stock anytime after the two-year anniversary of the issue date of that
series  if   all   of  the   equity  conditions  have  been  satisfied  and  the
volume-weighted  average  price  of   SpaceDev  common  stock  for  each  of  20
consecutive  trading  days  exceeds  2.5  times  the  current  conversion  price
(initially  $1.48).  The  foregoing  rights  of  conversion  are  subject  to  a
limitation  that  no  holder of Series D Preferred Stock is, for purposes of the
federal  securities  laws,  deemed  to  beneficially  own more than 4.99% of the
outstanding  shares of SpaceDev common stock or, if the holder waives this limit
with  61  days  notice,  more  than  9.99% of the outstanding shares of SpaceDev
common  stock.

     Voting  Rights.  The  Series D Preferred have no general voting rights, but
the  holders  of  a  majority of the outstanding Series D Preferred must vote in
favor  of  or  consent  to  certain  corporate  actions,  including:

-    changing  the relative rights, preferences or limitations of the applicable
     series  of  Series  D  Preferred  Stock;
-    authorizing  or issuing any securities that are pari passu or senior to the
     applicable  series  of Series D Preferred Stock, other than other series of
     Series  D   Preferred   Stock  permitted  by   the   financing   documents;
-    amending the SpaceDev articles of incorporation in a manner which adversely
     affects  the  rights of any holder of shares of Series D Preferred Stock or
     amending  the  SpaceDev  bylaws  in a manner which materially and adversely
     affects  any  rights  of  any holder of shares of Series D Preferred Stock;
-    increasing  of  the authorized number of shares of the applicable series of
     Series  D  Preferred  Stock;
-    incurring  or  guaranteeing  any  indebtedness  by  SpaceDev  or any of its
     subsidiaries,  other  than  for  specified  permitted  indebtedness;


                                     PAGE 7


-    creating  or  suffering  to  exist  any  lien on SpaceDev's property or the
     property  of  any  of  its subsidiaries, other than for specified permitted
     liens;
-    designating  any  class  or  series  of  capital stock having any rights or
     preferences  senior  or pari passu with the Series D Preferred Stock, other
     than  additional  series  of  Series  D  Preferred  Stock;
-    redeeming,  repurchasing or acquiring any shares of SpaceDev's common stock
     or  equivalent  securities  or  junior  securities;
-    issuing  any  variable-priced securities or entering into any variable-rate
     transaction;  or
-    paying  dividends  or  other  distributions  on SpaceDev's shares of junior
     securities  or  common  stock,  other than ordinary dividends on pari passu
     securities  if no dividends or other payments are past due on any series of
     Series  D  Preferred  Stock.

     Liquidation  Preferences.  Upon  any liquidation, dissolution or winding up
of SpaceDev, the holders of the Series D Preferred Stock are entitled to receive
from  the  assets  available for distribution to shareholders, for each share of
the  Series  D  Preferred Stock, an amount equal to the current stated value per
share  (initially $1,000), plus any accrued and unpaid dividends thereon and any
other  fees  or  liquidated  damages  owing  thereon, before any distribution or
payment  may  be made to any other holders of SpaceDev capital stock, other than
other pari passu shares (including the Series C Preferred Stock).  If the assets
available  for  distribution  to  shareholders  are  insufficient  to  pay   the
liquidation preferences of all shares of Series D Preferred Stock and other pari
passu shares, then each holder of shares of Series D Preferred Stock and/or pari
passu  shares will receive a percentage of the assets available for distribution
equal to (1) the full amount that would otherwise be payable to that holder upon
liquidation,  dissolution  or winding-up of our company, divided by (2) the full
amount that would be otherwise be payable to all holders of any series of Series
D  Preferred  Stock  or  any  pari  passu stock upon liquidation, dissolution or
winding-up  of  SpaceDev.

     Redemption Rights.  SpaceDev has the option of redeeming shares of Series D
Preferred  Stock,  in  whole or in part, for cash upon 20 trading days notice if
the  equity  conditions  described  below (other than the volume and share price
condition)  have been satisfied and SpaceDev is not participating in a change in
control  transaction.  The  redemption  price equals the current stated value of
the shares, multiplied by 115%, if prior to the 9 month anniversary of the issue
date of the shares, or 110%, if thereafter but prior to the 24 month anniversary
of  that  issue date, plus accrued and unpaid dividends and other amounts due on
the  shares.  On  and  after  the  24  month  anniversary of the issue date, the
redemption  price  is  equal  to 100% of the current stated value of the shares,
plus accrued and unpaid dividends and other amounts due on the shares.  SpaceDev
may also redeem all the shares of Series D Preferred Stock for cash equal to the
stated  value  of  such  shares (plus all accrued and unpaid dividends and other
amounts  due  on  such  shares) if SpaceDev is required to reclassify all of the
value of the applicable series of Series D Preferred Stock as a liability on its
balance  sheet.  If  SpaceDev  sends  a redemption notice, a holder of shares of
Series  D  Preferred  Stock  may  elect  to convert those shares pursuant to its
conversion rights described above before the redemption becomes effective.  If a
change of control transaction occurs within 6 months of a redemption that occurs
within  24  months  following  the issue date, the holder of the redeemed shares
will  be  entitled  to receive any additional compensation the holder would have
received  had  those  shares  been  redeemed  due  to  the  change  in   control
transaction,  as  described  below.

     In addition, on each monthly anniversary of the issue date of any series of
Series  D Preferred Stock, following the 6 month anniversary of that issue date,
SpaceDev  may  elect  to  redeem  in  part each share of that series of Series D
Preferred  Stock,  in  an  amount equal to the quotient of 1/54 of the aggregate
stated  value  of  the  shares of that series on such date, which we refer to in
each  case  as  the  monthly  optional redemption amount.  SpaceDev may pay this
amount  in  cash  or,  subject  to satisfaction of the equity conditions, with a
number  of  shares  of  SpaceDev  common  stock  equal to 1.12 times the monthly
optional  redemption  amount,  divided  by  the volume weighted average price of
SpaceDev  common stock for the 10 trading days immediately preceding the monthly
redemption  date.  Such  a  partial redemption will decrease the stated value of
each share of the applicable series of Series D Preferred Stock by an amount per
share  equal  to the monthly optional redemption amount divided by the number of
then  outstanding  shares of that series.  If SpaceDev does not redeem a part of
any  series  of Series D Preferred Stock which SpaceDev has the right to redeem,
the  dividend  rate  on  that  portion  will  increase  to not less than 15%, as
described  above.

     SpaceDev  is also required to redeem the shares of Series D Preferred Stock
upon  the  occurrence  of  a  triggering  event  other  than a change in control
transaction  at  a  price  equal  to  the sum of greater of (x) 130% and (y) the
volume  weighted average price of its common stock on the trading date preceding


                                     PAGE 8


the  triggering  event divided by the conversion price, multiplied by the stated
value of the shares, plus all accrued but unpaid dividends and other amounts due
on  the shares.  In the event of a change in control transaction, the redemption
price  equals  130%  of  the  stated  value  of  the  shares.  In  the event the
triggering  event  is  the  failure  of the Starsys merger to occur by March 31,
2006,  the  holder  requiring the redemption of its shares of Series D Preferred
Stock  must  surrender  its  preferred  stock  warrants.

     Conversion Price Adjustments.  The conversion price of the shares of Series
D  Preferred  Stock  will  be  appropriately  adjusted  in  the  event  of stock
dividends, stock splits, reverse stock splits or reclassifications, or specified
pro  rata  asset distributions, affecting SpaceDev common stock.  The stock into
which the shares of Series D Preferred Stock can be converted and the conversion
price  will also be adjusted upon the occurrence of a fundamental transaction (a
merger  or  consolidation  of  SpaceDev,  the  sale  of all or substantially all
SpaceDev assets, a successful tender or exchange offer affecting SpaceDev common
stock,  or  a  reclassification  of  SpaceDev  common  stock).

     Equity  Conditions.  SpaceDev's  right  to  take  certain actions under the
Series  D  Preferred  Stock,  including  its option to redeem shares of Series D
Preferred  Stock,  to  force  the  conversion  of a series of Series D Preferred
Stock,  to  make  optional  monthly  redemptions of shares of Series D Preferred
Stock  in  shares  of  its  common  stock in lieu of cash or to pay dividends on
shares  of  Series  D  Preferred  Stock in shares of its common stock in lieu of
cash,  depend  on the following conditions being satisfied, which we refer to as
the  equity  conditions:

-    SpaceDev  has  complied  with specified obligations to holders of shares of
     Series D Preferred Stock, including honoring all conversions and paying all
     amounts  owed  to  holders;
-    An  effective  registration  statement  which the holders may use to resell
     shares  of  SpaceDev  common  stock  acquired  pursuant  to  the  financing
     documents  is  available  to  the  holders;
-    The  SpaceDev common stock is trading on a public trading market (including
     the  OTC  Bulletin  Board)  and  the  shares of SpaceDev common stock to be
     issued  pursuant  to the financing documents are listed for trading on that
     market;
-    No  triggering  event  (as  described  below)  exists  or  is  imminent;
-    The  issuance  of  shares  to  the  holder would not violate the beneficial
     ownership  limitations  described  above;
-    For  a  period  of  20 trading days prior to the date of determination, the
     daily  average  dollar  volume  for  shares of SpaceDev common stock on the
     trading  market  exceeds  $100,000  per trading day and the volume weighted
     average price of SpaceDev common stock for each of those trading days is at
     least  $1.50  per  share  (subject  to  adjustment);  and
-    No  fundamental  transaction or change in control transaction is pending or
     proposed.

     Triggering  Events.   For  purposes  of   the   Series  D  Certificates  of
Designations,  a  triggering  event  is  defined as the occurrence of any of the
following  events:

-    The  initial  registration  statement  required  by the registration rights
     agreement does not become effective by June 12, 2006 or, after the issuance
     of  shares  of  a  new  series  of Series D Preferred Stock, a registration
     statement required by the registration rights agreement to cover the shares
     of  common  stock  issuable  on  account  of  that  series  does not become
     effective  within  120  days  of  the  issue  date  of  those  shares;
-    Any  registration statement required to be effective under the registration
     rights  agreement  is unavailable for more than 45 days during any 12-month
     period,  or  a  holder may not resell its securities under the registration
     statement  for  15  consecutive  days  or  for more than 45 days during any
     12-month  period,  in  either  case subject to a 20-day increase for delays
     caused  by an SEC review of our registration statement or periodic reports;
-    SpaceDev  does  not  comply  with  its  obligations  promptly   to  achieve
     effectiveness  of the initial registration statement under the registration
     rights  agreement;
-    SpaceDev  breaches various obligations due to holders of Series D Preferred
     Stock,  including: failing to deliver share certificates upon conversion on
     time;  failing  to  pay  specified amounts owed on time; failing to reserve
     sufficient  shares  of  its  common  stock  to issue upon the conversion of
     shares  of  Series  D  Preferred Stock; or redeeming junior securities;
-    the  occurrence  of  a  change  in  control transaction affecting SpaceDev,
     including  the  acquisition  by  a group of 33% of the voting securities of
     SpaceDev;

                                     PAGE 9


-    the  occurrence  of  various  insolvency  or  bankruptcy  events  affecting
     SpaceDev  or  any  of  its  significant  subsidiaries;
-    the  failure  of SpaceDev common stock to be traded on a trading market for
     more  than  5  trading  days  (whether  or  not  consecutive);  and
-    the  failure  of  the  merger  to  be  consummated  by  March  31,  2006.

     The  Series  D-1  Certificate of Designations and Series D-2 Certificate of
Designations have been filed as exhibits to the current report on Form 8-K filed
by  SpaceDev  with  the  SEC  on  January  13,  2006.


                               DISSENTERS' RIGHTS

     California General Corporation Law.  Due to a change in the initial listing
requirements  at  the  American Stock Exchange, which became effective after the
date  of  the  joint proxy statement/prospectus, shares of SpaceDev common stock
will not be listed on the American Stock Exchange or another national securities
exchange  or  the  NASDAQ  National Market at the time of the merger.  Shares of
SpaceDev common stock will continue to be traded on the OTC Bulletin Board under
the  symbol  "SPDV.OB".  As  a  result,  the  rights of SpaceDev shareholders to
exercise  appraisal  rights, and the procedures to exercise these rights, are as
described  below.

     The  following  summary  of  appraisal  rights under the California General
Corporation  Law  is  not  intended to set forth definitively all of the law and
procedures  relating  to  perfection  of  dissenters  rights  under  the General
Corporation  Law.  SpaceDev  shareholders  are  referred  to  the  text  of  the
applicable  sections  of  such  law,  set  forth  in  Annex C to the joint proxy
statement/prospectus.  In  view  of  the  complexity  of   these  provisions  of
California  law,  SpaceDev  shareholders  who  are  considering exercising their
appraisal  rights  should  consult  a  legal  advisor.

     Under Chapter 13 of the General Corporation Law, a SpaceDev shareholder who
desires  to  exercise his or her appraisal rights with respect to some or all of
his  or her shares and obtain the payment of cash for those shares must take the
following  four  steps  in order to perfect the right to obtain an appraisal and
the  payment  of cash.  First, the shareholder must not vote the shares in favor
of  the  merger.  Second,  SpaceDev  or  its  transfer  agent  must  receive the
shareholder's  demand  for  the payment of cash for the shares within 30 days of
the  date  SpaceDev mails a notice of approval of the merger to the shareholder,
as  described  below.  Third,  the  shareholder  must  submit to SpaceDev or its
transfer  agent  the  certificates  representing the shares, properly stamped or
endorsed,  within  30  days  of  the  date of the mailing date for the notice of
approval.  Shares  which  were  not voted in favor of the merger and for which a
timely demand and share certificate submission have been made become "dissenting
shares", unless they lose their status as dissenting shares, as described below.
Fourth,  if  the  shareholder  and  SpaceDev are unable to reach an agreement on
whether  shares  are  dissenting  shares  and/or on the price to be paid for the
dissenting  shares,  the  shareholder  must  file an action in a proper superior
court  in  California  within  six  months of the mailing date for the notice of
approval  to  have  the  court  determine  the  fair  market  value.

     If  the  merger  is  approved  at the special meeting, SpaceDev must mail a
notice  of  the  approval  to  each  of  its  shareholders  eligible to exercise
appraisal  rights under Chapter 13 of the General Corporation Law within 10 days
after  the  approval.  The notice must include a copy of specified provisions of
Chapter  13 of the General Corporation Law, a brief description of the procedure
to  be  followed  if  a  shareholder  desires to exercise appraisal rights under
Chapter  13,  and  a statement of the price SpaceDev has determined to represent
the  fair  market  value  of  dissenting shares.  The fair market value is to be
determined  as  of  the  day  before  the first announcement of the terms of the
merger,  excluding  any  appreciation  or  depreciation  in  consequence  of the
proposed  merger.  SpaceDev  anticipates this price to be $1.49 per share, which
was  the  closing  price  of  SpaceDev common stock on October 25, 2005, the day
before SpaceDev filed a periodic report on Form 8-K with the SEC which described
the  terms  of  the  proposed  merger.  Under Chapter 13, the statement of price
constitutes  an offer by SpaceDev to purchase any dissenting shares at the price
stated.

     SpaceDev  shareholders  who  have  not  voted  their shares in favor of the
merger  and merger agreement may exercise their appraisal rights by delivering a
written demand for the purchase of those shares for their fair market value, and
submitting  the  share certificates evidencing those shares, properly stamped or
endorsed,  to SpaceDev or its transfer agent.  The demand and share certificates
must be received by SpaceDev or its transfer agent within 30 days of the mailing


                                     PAGE 10


of  the  notice of approval of the merger.  The demand must state the number and
class  of  the  dissenting  shares  and  must  contain  a  statement of what the
shareholder  claims  to  be the fair market value of the dissenting shares as of
the  day  before  the announcement of the merger, even if the shareholder agrees
with  SpaceDev's  determination  of  the  fair market value of the shares as set
forth  in  SpaceDev's  notice  of  approval.  The  demand  must  be  made by the
shareholder  of record to be effective.  Accordingly, in the event a shareholder
holds  shares  of  SpaceDev  common  stock  in street name, the shareholder must
ensure  that  the demand and share certificate submission are made on his or her
behalf  by  the record holder of the shares.  Under Chapter 13, the statement of
fair market value will constitute an offer by the shareholder to sell the shares
to SpaceDev at that price.  A dissenting shareholder may not withdraw the demand
for  purchase  of  dissenting  shares  without  the  consent  of  SpaceDev.

     If  SpaceDev  and  a shareholder exercising appraisal rights agree that the
shares  are  dissenting  shares  and  agree  upon  the  price of the shares, the
shareholder  is  entitled to receive the agreed price with interest at the legal
rate on judgments, currently 10% per annum, from the date of agreement.  Payment
is to be made out of legally available funds (as described below) within 30 days
after  the  date  of  the  agreement  or  within  30 days after any statutory or
contractual  conditions  to  the  merger  are satisfied, whichever occurs later.

     If  SpaceDev  denies  that the shares are dissenting shares, or if SpaceDev
and  the  SpaceDev  shareholder  fail to agree upon the fair market value of the
shares,  then  the shareholder, within six months after the date on which notice
of  the  approval  of  the  merger  was  mailed  to  the shareholder, may file a
complaint  or  intervene  in  a  pending  action  in  a proper superior court in
California,   seeking  a  judicial  determination  of  whether  the  shares  are
dissenting   shares  and/or  the  fair  market  value  of  the  shares.  If  the
shareholder  does  not  file a complaint or intervene in a pending action within
the six month period, the shares will lose their status as dissenting shares and
the  shareholder  will  lose  his  or her appraisal rights with respect to those
shares.  The  court  may enter judgment against SpaceDev for payment of the fair
market  value  of dissenting shares, together with interest thereon at the legal
rate  on  judgments  from the date of judgment, subject to delivery of the share
certificates  evidencing  the  dissenting shares properly stamped or endorsed to
SpaceDev.  The  costs  of  the  proceedings  may  be  apportioned  as  the court
considers  equitable, but if the price determined by the court exceeds the price
offered by SpaceDev, SpaceDev must pay the costs, and if the price determined by
the  court exceeds the price offered by SpaceDev by more than 25%, the court may
in  its discretion order SpaceDev to pay the shareholder's attorneys' and expert
fees and interest at the legal rate on judgments from the date the shares became
dissenting  shares.

     Payment  of  the  price  for  dissenting  shares  is subject to funds being
legally available under Chapter 5 of the General Corporation Law.  If sufficient
funds  are  not  legally  available,  a  shareholder's claim for the purchase of
dissenting  shares  would  become  a  subordinated claim earning interest at the
legal rate for judgments, payable when permitted by Chapter 5.  Under Chapter 5,
the  amount of funds lawfully available to purchase dissenting shares is limited
to  the  excess  of  the assets of SpaceDev (excluding goodwill, capitalized R&D
expenses  and  deferred  charges)  over  the  sum of the liabilities of SpaceDev
(excluding  deferred taxes, deferred income and other deferred credits) plus the
aggregate  liquidation  preferences  of  the  outstanding  shares  of SpaceDev's
preferred  stock.  SpaceDev  does  not  anticipate  that  funds would be legally
available  to  pay  for  dissenting shares after the consummation of the merger,
and,  accordingly, any proper demand for the purchase of dissenting shares would
become  a subordinated claim and no assurances can be provided when such a claim
could  be  lawfully  paid  to  the  dissenting  shareholder.

     Dissenting shares would lost their status as dissenting shares under any of
the  following  circumstances:

-    The  merger  is  abandoned;
-    The  shares  are  transferred prior to submission of the share certificates
     properly   stamped   or  endorsed   to  SpaceDev  or  its  transfer  agent;
-    SpaceDev  and  the  shareholder  disagree as to the status of the shares as
     dissenting  shares  or  as  to their fair market value, and neither files a
     complaint  with  a proper court in California as described above within six
     months  of  the date on which SpaceDev mailed notice of the approval of the
     merger  to  the  shareholder;  or
-    The  shareholder,  with  the  consent of SpaceDev, withdraws the demand for
     SpaceDev  to  purchase  of  the  dissenting  shares.


                                     PAGE 11


                       WHERE YOU CAN FIND MORE INFORMATION

     SpaceDev has filed with the SEC a Form S-4 registration statement under the
Securities  Act  of  1933  with respect to the common stock offered by the joint
proxy  statement/prospectus.  The  joint  proxy  statement/prospectus  and  this
supplement, which together constitute part of the registration statement, do not
contain  all  of the information set forth in the registration statement and its
exhibits  and  schedules,  certain parts of which are omitted in accordance with
the  rules  and  regulations  of  the  SEC.  For  further  information regarding
SpaceDev's  common stock and SpaceDev, please review the registration statement,
including  exhibits,  schedules  and reports filed as a part of the registration
statement.   Statements   in  the  joint  proxy  statement/prospectus  and  this
supplement  about  the  contents  of  any contract or other document filed as an
exhibit to the registration statement or the current report on Form 8-K filed by
SpaceDev  with  the  SEC  on  January  13,  2006 set forth the material terms of
contracts  or other documents but are not necessarily complete. The registration
statement  and current report on Form 8-K, including the exhibits and schedules,
may  be inspected without charge at the principal office of the public reference
facilities  maintained by the SEC at 100 F Street, N.E., Washington, D.C. 20549.
Copies  of  this material can also be obtained at prescribed rates by writing to
the Public Reference Section of the SEC at its principal office at 100 F Street,
N.E.,  Washington,  D.C.  20549.  You may obtain information on the operation of
the  public  reference facilities by calling the SEC at 1-800-SEC-0330.  The SEC
maintains  a  Web  site  (http://www.sec.gov/)   that  contains  reports,  proxy
statements  and other information regarding registrants that file electronically
with  the  SEC, including SpaceDev. Additional information about SpaceDev can be
obtained  from its Internet website at http://www.spacedev.com/.  The content of
this website does not constitute part of the joint proxy statement/prospectus or
this  supplement.

     If  you  have  any  questions  about  the  merger,  the  non merger-related
proposals  of  SpaceDev  or  the meetings of SpaceDev and Starsys, including the
procedures for voting your shares, or if you need additional copies of the joint
proxy  statement/prospectus,  this  supplement or the proxies or (in the case of
Starsys  shareholders  only)  transmittal  letters enclosed with the joint proxy
statement/prospectus,  please  contact:

                           FOR SPACEDEV SHAREHOLDERS:

                                 SpaceDev, Inc.
                                13855 Stowe Drive
                                 Poway, CA 92064
                          Attention: Investor Relations
                                 (858) 375-2026

                            FOR STARSYS SHAREHOLDERS:

                          Starsys Research Corporation
                            4909 Nautilus Court North
                             Boulder, Colorado 80301
                       Attention: Chief Executive Officer
                                 (303) 583-1400

     Additional  copies  of  the  joint  proxy   statement/prospectus  and  this
supplement  may  also  be  obtained from Exchange Agent at the following office:

                  Continental Stock Transfer and Trust Company
                                17 Battery Place
                               New York, NY 10004
                      Attention: Reorganization Department
                                 (212) 509-4000

     Any  questions may also be directed to Investor Relations at SpaceDev, Inc.
at  (858)  375-2026.



                                     PAGE 12