NASA has sent five robotic vehicles to Mars. Sojourner, Spirit, Opportunity, Curiosity, and Perseverance. Look back at the missions. (NASA/AFP via Getty Images) Martian mudstones contain features that ...
Add Yahoo as a preferred source to see more of our stories on Google. NASA to Earthlings: Help us farm Mars. The nation's space agency has launched an international competition to help feed astronauts ...
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