The earth has an atmosphere that is about 60 miles
thick...Beyond that , we call the next environment
space...There is interplanetary space,
interstellar space, intergalactic space. As far as
anyone knows, it seems like it goes on... at least
for 10^26 meters.That is
A meter is about a yard.Your question is the
subject matter of cosmology.Many people from the
first stone age peoples to today have asked this
question. know one really knows the answer.But we
can distinguish between the very thin part of the
Earth's upper atmosphere and true space.
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