Answer 1:
As far as we know, space has no edge or
boundary. When scientists describe the
expansion of the universe, they mean the space
itself in between all the "stuff." So it's not
that the stuff is radiating outward from a center
point, but rather that space itself can stretch
and expand, causing the distance between objects,
such as galaxies, to increase.
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Answer 2:
There are no boundaries (none that we are aware
of). The distance between objects in space is
getting larger, and the farther apart two
objects are, the faster they are moving away from
each-other. There is no center point from which
space is expanding, nor any void or anything else
that space is expanding into. The geometry itself
is expanding.
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