Mercury has little atmosphere, but what it does have is made up mostly of oxygen, sodium, hydrogen, helium and potassium. The thin atmosphere, or exosphere, does little to prevent or slow down impacts ...

Because Mercury is much closer to the sun ... composition 'exploded' in 3D through the planet’s very thin atmosphere, known as its exosphere," MPPE instrument lead Dominique Delcourt, from ...

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and discovered a surprising amount of water in Mercury’s exosphere. It also found evidence for past volcanic activity and the possibility that Mercury has a liquid-iron core. Since March 17 ...