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



               SPACEDEV                         STARSYS RESEARCH              




                JOINT PROXY STATEMENT/PROSPECTUS SUPPLEMENT NO. 2
         (To joint proxy statement/prospectus dated December 29, 2005 and
    joint proxy statement/prospectus supplement no. 1 dated January 23, 2006)

                                12,357,143 SHARES

                                 SPACEDEV, INC.

                    COMMON STOCK, PAR VALUE $0.001 PER SHARE


     This  joint  proxy statement/prospectus supplement no. 2, which we refer to
as this supplement, updates and supplements our joint proxy statement/prospectus
dated  December  29,  2005 and joint proxy statement/prospectus supplement no. 1
dated  January  23,  2006,  which  we  refer  to  together  as  the  joint proxy
statement/prospectus  and  which form 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 Starsys to advise them of an increase in the
working  capital  adjustment  that  would  decrease  the consideration we expect
Starsys  shareholders  to  receive  if  the  merger is approved and consummated.

     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   THE   JOINT   PROXY
STATEMENT/PROSPECTUS  SUPPLEMENT  NO.  1.

     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  Board  of  Directors  of Starsys continues to enthusiastically support
this  reorganization,  and  recommend that you vote FOR the merger and the other
proposals.

    This joint proxy statement/prospectus supplement no. 2 is dated January 29,
                                      2006.

                                      PAGE

                                EXPLANATORY NOTE

     Based on the Balance Sheet of Starsys dated January 26, 2006, the amount of
consideration  to  be received by the Starsys shareholders in the merger will be
decreased  by  a  working  capital adjustment of approximately $2,100,000 rather
than  the  approximate  $1,100,000  working  capital adjustment described in the
joint  proxy statement/prospectus. This supplement describes the effect of these
changes.  The  sections  and  subsections  below  update  selected  sections and
subsections  from  the  joint  proxy  statement/prospectus.

     Please  note  that  Starsys  intends to call the special meeting of Starsys
shareholders  to order at 10:00 a.m. Mountain Standard Time on January 30, 2006,
and  then adjourn the meeting for approximately one hour to count final proxies.
If  you  have  sent in a proxy to the exchange agent and you wish to change your
vote,  please contact Starsys at the telephone number indicated on the last page
of  this  supplement  prior  to  11:00  a.m.  Mountain  Standard  Time.

                                     SUMMARY
                                     -------

THE  MERGER
-----------

Q:     WHAT  WILL  STARSYS  SHAREHOLDERS  RECEIVE  IN  THE  MERGER?

A:     Starsys  shareholders  will  be  entitled  to  receive  the  following
consideration  at  the  effective  time  of the merger, subject to adjustment as
provided  in  the  merger  agreement:

     -  cash  in  the aggregate amount of up to $1,500,000, which is expected by
     Starsys'  management to be reduced by approximately $845,000 in transaction
     costs  and  to be further reduced by approximately $351,000 working capital
     adjustments,  or  approximately  $304,000  after  reductions;  and,

     -  an  aggregate  number  of  shares  of SpaceDev common stock equal to the
     quotient  of (A) $7,500,000, which is expected by Starsys' management to be
     reduced  by  approximately  $365,000 in transaction costs and to be further
     reduced  by  approximately  $1,758,000  in  working capital adjustments, or
     approximately  $5,377,000  after  reductions,  divided  by  (B)  the volume
     weighted average price of SpaceDev common stock for the twenty trading days
     preceding  the merger, which, based on current information and assuming the
     merger closes on January 31, 2006, is estimated to be between approximately
     $1.43  and  $1.47.

     The  amounts presented as transaction costs and working capital adjustments
are  only estimates and may increase prior to closing.  Based on the formula and
estimates  described  above,  at the closing of the merger, Starsys shareholders
are  expected  to  receive  merger consideration having a value of approximately
$10.86  per share of Starsys common stock, consisting of approximately $0.58 per
share  in  cash  and approximately $10.28 per share in shares of SpaceDev common
stock (based on 523,008 shares of Starsys common stock outstanding as of January
26,  2006  and on the estimated volume weighted average price of SpaceDev common
stock  as  described  above).

     Fifty percent (50%) of the number of shares of SpaceDev common stock issued
at  closing  (without  taking  into  account any shares of SpaceDev common stock
deliverable  to  the  shareholder  agent  at the closing for the satisfaction of
certain  transaction  expenses  incurred  by  Starsys related to the sale of the
company)  will  be  deposited  in  escrow  as  security  for  the   payment   of
indemnification claims under the merger agreement and to pay certain expenses of
the  shareholder agent, which escrow will continue until ten (10) days following
the  date of audited financial statements prepared for the surviving corporation
for  the  fiscal  year  ending 2006 (i.e., approximately April 2007), subject to
extension  in  the  event  claims  are  outstanding  on  that  date.

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                                        1

     Following the merger, Starsys shareholders may also be entitled to receive,
based on the achievement by the Starsys business of certain performance criteria
for  each  of  the  fiscal years ending December 31, 2005, December 31, 2006 and
December  31,  2007, additional performance-based consideration consisting of up
to:

     -  For  the  fiscal  year  ended December 31, 2005, $350,000 in cash and an
     aggregate  number  of shares of SpaceDev common stock equal to the quotient
     of (A) up to $3,000,000 divided by (B) the volume weighted average price of
     SpaceDev common stock for the twenty trading days preceding the date of the
     audit  opinion  for  Starsys'  fiscal year ended December 31, 2005, but not
     less  than  $2.00;

     -  For  the  fiscal  year  ended December 31, 2006, $350,000 in cash and an
     aggregate  number  of shares of SpaceDev common stock equal to the quotient
     of (A) up to $7,500,000 divided by (B) the volume weighted average price of
     SpaceDev common stock for the twenty trading days preceding the date of the
     audit  opinion  for  Starsys'  fiscal year ended December 31, 2006, but not
     less  than  $2.50;  and

     -  For  the  fiscal  year  ended December 31, 2007, $350,000 in cash and an
     aggregate  number  of shares of SpaceDev common stock equal to the quotient
     of (A) up to $7,500,000 divided by (B) the volume weighted average price of
     SpaceDev common stock for the twenty trading days preceding the date of the
     audit  opinion  for  Starsys'  fiscal year ended December 31, 2007, but not
     less  than  $3.00.

     Starsys believes it is unlikely that it will achieve one of the performance
criteria  for  the  fiscal  year  ending  December  31,  2005.  This performance
criteria  is  subject to adjustment following the year end pursuant to its audit
of  its  financial records.  If Starsys does not meet this performance criteria,
the  Starsys  shareholders  will  not  receive any performance consideration for
2005.

     If  any  shares  of  SpaceDev  common  stock  are  payable  as  performance
consideration  for the fiscal year ending December 31, 2005, fifty percent (50%)
of those shares will be deposited in the escrow described above. In addition, 1%
of any shares of SpaceDev common stock payable as performance consideration will
be  paid  as  transaction  expenses  to  Robert Vacek, the president of Starsys.

     In  addition,  Starsys shareholders will be entitled to receive the maximum
amount  of  performance  consideration  for a particular fiscal year if SpaceDev
materially  breaches specific covenants of the merger agreement and is unable to
cure  the  breach  within  the  cure  period  set forth in the merger agreement.

     For  more  information,  see  "The  Merger  - The Merger Agreement - Merger
Consideration"  beginning  on  page  3  of  this  supplement.

                       COMPARATIVE PER SHARE MARKET VALUE

     The common stock of SpaceDev is traded on the OTC Bulletin Board, or OTCBB,
under  the  symbol  "SPDV.OB".  On  October  25, 2005, the last full trading day
prior  to the public announcement of the proposed merger, the last reported sale
price  of  SpaceDev's common stock on the OTCBB was $1.49 per share.  On January
27,  2006,  the last reported sale price of SpaceDev's common stock on the OTCBB
was $1.44 per share.  The volume weighted average price of SpaceDev common stock
for the twenty trading days preceding January 31, 2006 is currently estimated to
be  approximately $1.43 to $1.47 per share.  Starsys is a privately-held company
and  there  is  currently  no  established  market  for  its  securities.

     Assuming  the  merger  closes  on  January  31, 2006, at the closing of the
merger, Starsys shareholders are expected to receive merger consideration having
a value of approximately $10.86 per share of Starsys common stock, consisting of
approximately  $0.58 per share in cash and approximately $10.28 per share (based
on  the  estimated  volume  weighted  average  price of SpaceDev common stock as
described  above)  in  shares  of  SpaceDev  common  stock. The estimated merger

                                      PAGE
                                        2

consideration  per  share  is  based  on  523,008 shares of Starsys common stock
outstanding  as  of  January  26,  2006,  and  assumes  that  an  aggregate   of
approximately $304,000 in cash, after estimated adjustments, and an aggregate of
approximately  $5,377,000  in  shares  of  SpaceDev  common  stock (based on the
estimated  volume  weighted average price of SpaceDev common stock, as described
above), after estimated adjustments, will be paid to the Starsys shareholders at
the  closing of the merger. Starsys shareholders may also be entitled to receive
additional  performance-based  consideration following the closing of the merger
payable in cash and shares of SpaceDev common stock. For more information on the
merger  consideration to be received by the Starsys shareholders pursuant to the
merger  agreement,  see  "The  Merger - Merger Agreement - Merger Consideration"
below.


                              THE MERGER AGREEMENT

MERGER  CONSIDERATION

Shareholder  Consideration

     Closing  Consideration.  SpaceDev  will  pay  and issue up to the following
total maximum consideration to the Starsys shareholders at the effective time of
the  merger  on  a  pro  rata  basis:

     -  cash  in  the  aggregate  amount  of  $1,500,000;  and,

     -  a  number of shares of SpaceDev common stock equal to $7,500,000 divided
     by  the  volume-weighted  average  price  of  SpaceDev common stock for the
     preceding 20 trading days (estimated to be approximately $1.43 to $1.47 per
     share,  assuming  the  merger  closes  on  January  31,  2006).

     These  amounts  are  subject  to  reduction for the payment of some Starsys
transaction  expenses  and for any excess working capital deficit about the time
of  the  merger,  as  described  under  the  subcaptions  "- Starsys Transaction
Expenses"  in  the  joint  proxy  statement/prospectus  and  "-Working  Capital
Adjustment"  below.  Starsys  management  anticipates that, after the payment of
these expenses and the application of these adjustments, $304,000 in cash and up
to  $5,377,000 in shares of SpaceDev common stock (based on the estimated volume
weighted  average  price  of  SpaceDev  common stock as described above) will be
available  for  distribution  to  Starsys shareholders.  In addition, 50% of the
shares  issued at the time of the merger will be placed in an escrow account and
in  an  expense fund, as described under the caption "Escrow" in the joint proxy
statement/prospectus.

Working  Capital  Adjustment

     The  amount  of cash and shares of SpaceDev common stock to be delivered by
SpaceDev  at  the  closing  of  the  merger may be adjusted based on the Starsys
adjusted  working  capital  deficit  calculated  as  of  January  26, 2006.  The
adjustment  is based on the amount by which the Starsys business working capital
deficit,  after payment of the Starsys transaction expenses and repayment of the
Starsys  loans (as described under the subcaptions "- Loan Repayments" below and
"-  Starsys  Transaction  Expenses"  in  the  joint proxy statement/prospectus),
exceeds  $1.68 million.  If this amount is a positive value, the cash to be paid
by  SpaceDev at the closing will be reduced by one-sixth of that amount, and the
$7.5  million  amount  used to calculate the number of shares of SpaceDev common
stock  to  be  delivered  at  the closing will be reduced by five-sixths of that
amount.  Starsys  management has calculated the working capital adjustment to be
approximately  $2,100,000  as  of  January  26,  2006.

Loan  Repayments

     At  the closing of the merger, SpaceDev will: (i) subject to a $4.6 million
limit  on  loan  repayments,  repay  the remaining principal and interest of all
loans  to  Starsys  from  Vectra  Bank  Colorado,  which  we refer to as Vectra,
together  with  any other costs, expenses and liabilities incurred in connection
with  those  loans,  which  we  refer  to  as  the Vectra loans; (ii) cancel and

                                      PAGE
                                        3

terminate  the  secured  loan of $1.2 million and all accrued interest and fees,
from  SpaceDev  to  Starsys,  which we refer to as the SpaceDev loan; and, (iii)
repay  subordinated  loans  in  the  aggregate principal amount of approximately
$880,000  owed  by  Starsys  to  certain  Starsys  shareholders  plus  interest.
SpaceDev  will not be obligated to pay off more than $4,600,000 in the aggregate
(excluding  the  amount of the SpaceDev loan) for all of these loans and related
costs.  Any  amounts  over  $4,600,000  will  be  deducted  from  shareholder
consideration  through  the working capital adjustment.  The aggregate principal
and  interest  on  all  these  loans  is  expected  on  January  31,  2006 to be
approximately  $52,000  over  $4,600,000.

Estimated  Merger  Consideration  Per  Share  at  Closing

     Assuming  the  merger  closes  on  January  31, 2006, at the closing of the
merger, Starsys shareholders are expected to receive merger consideration having
a value of approximately $10.86 per share of Starsys common stock, consisting of
approximately  $0.58 per share in cash and approximately $10.28 per share (based
on  the  estimated  volume  weighted  average  price of SpaceDev common stock as
described  under  "The  Merger  Agreement  -  Merger Consideration - Shareholder
Consideration"  above) in shares of SpaceDev common stock.  The estimated merger
consideration  per  share  is  based  on  523,008 shares of Starsys common stock
outstanding  as  of  January  26,  2006,  and  assumes  that  an  aggregate   of
approximately $304,000 in cash, after estimated adjustments, and an aggregate of
approximately  $5,377,000  in  shares  of  SpaceDev  common  stock (based on the
estimated  volume  weighted  average  price  of  SpaceDev  common  stock), after
estimated  adjustments,  will be paid to the Starsys shareholders at the closing
of  the  merger.

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                                        4

                       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.  The  registration  statement,  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 meeting of SpaceDev, 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 transmittal letters
enclosed  with  the  joint  proxy  statement/prospectus,  please  contact:


                            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

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