Water found an inch beneath the Martian surface could help future astronauts

Photos: The best moments on Mars
This artist's illustration shows the ExoMars Trace Gas Orbiter as it orbits Mars. The orbiter detected a layer of glowing green oxygen in Mars' atmosphere.
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Photos: The best moments on Mars
NASA's Curiosity Mars rover took a selfie shortly before completing its steepest climb yet on Mars up the Greenheugh Pediment, which tilted the rover 31 degrees.
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