MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Future Mars mission. Computer illustration of a hypothetical space shuttle in orbit around Mars. Mars' largest moon, Phobos, is seen at upper right. A manned mission to Mars has been a long- standing goal of the space community. Mars is the most similar planet to Earth in environment, although the numerous probes sent there have found no evidence of life.
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