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Why doesn't the water from earth fall into space?
Question Date: 2013-02-27
Answer 1:

Good question! Water doesn’t fall into space from earth because of the earth’s gravity. Earth is very massive and has a strong gravitational field. It is pulling the water toward it and won’t let it go. Some matter does escape earth’s gravity and diffuse out into space. Light gases like hydrogen and helium can escape earth’s gravity if the gas molecules have a high enough energy in the stratosphere. Liquid water on the earth’s surface is held too tightly.

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