News from Mars: A mile-deep ice crater and marsquakes

By Ashley Strickland, CNN

Updated 1853 GMT (0253 HKT) December 20, 2018

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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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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