Volcanoes on the moon might have left a chilling legacy: water ice.
in 2009, scientists have debated the possible origins of water on the moon, which include asteroids, comets or electrically charged atoms carried by the solar wind . Or, possibly, the water originated on the moon itself, as vapor belched by the rash of volcanic eruptions from 4 billion to 2 billion years ago.
Some of this vapor would have been lost to space, as sunlight broke down water molecules or the solar wind blew the molecules off the moon. But at the frigid poles, some could have stuck to the surface as ice. The results align with a long-standing assumption that ice dominates at the poles because it gets stuck in cold traps that are so cold that ice will stay frozen for billions of years.These results from a computer simulation depict the potential present-day distribution and thickness of ice at the lunar poles following volcanic eruptions 4 billion to 2 billion years ago. The south pole retains more ice because it has more cold traps than the north pole .
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