WASHINGTONCopyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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WASHINGTON (AP) — NASA's future plans to explore Mars may end up using astronauts as space messengers.
WASHINGTONCopyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
38.8951-77.0364
WASHINGTON (AP) — After driving all around Mars with four rovers, NASA wants to look deep into the guts of the red planet.
