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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