Researchers said Wednesday they had observed water vapour escaping high up in the thin atmosphere of Mars, offering tantalising new clues as to whether the Red Planet could have once hosted life.
The traces of ancient valleys and river channels suggest liquid water once flowed across the surface of Mars. Today, the water is mostly locked up in the planet’s icecaps or buried underground.
But some of it is vaporising, in the form of hydrogen leaking from the atmosphere, according to the new r...
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