NASA says it wants to take a closer look at proposals for robotic space missions that would bring a piece of an asteroid back to Earth, sniff the air of Venus, map the moon's gravity field, and give the Deep Impact probe and/or the Stardust probe a new lease on life. Check out this news release for more about the concept studies being approved as part of the space agency's Discovery program - and stay tuned for the final selection next year.
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