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NASA Mars samples, which could contain evidence of life, will not return to Earth as initially planned

NASA's plan to retrieve as many as 30 geological samples from Mars is getting a major rewrite, agency officials said on Monday. The initial plan, which would not return the samples to Earth until 2040, was deemed "too expensive" and "unacceptably too long."
Read MoreNASA Mars samples, which could contain evidence of life, will not return to Earth as initially planned