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12. Solar System Planets and Exoplanets
13. Space 50. The next frontier : from the Moon to Mars
14. Space age
15. Space cooperation : Agreement between the United States of America and the European Space Agency, Effected by Exchange of letters at Paris and Washington, June 22 and 28, 2010
16. Space cooperation : ExoMars Mission : memorandum of understanding between the United States of America and the European Space Agency, signed at Paris and Washington, April 14 and 29, 2014
17. Space cooperation : High Energy Neutron Detector : agreement between the United States of America and the Russian Federation, signed April 6, 2001, with annex; and agreement extending and amending the agreement, signed September 12 and 18, 2006
18. Space cooperation : implementing agreement between the United States of America and the Russian Federation, signed at Moscow, March 10, 2007
19. Space cooperation : Mars Science Laboratory Mission : agreement between the United States of America and Spain signed at Madrid, March 17, 2011
20. Space Nuclear Propulsion for Human Mars Exploration
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