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If space is constantly expanding, what exists beyond its boundaries? What is space expanding into?
Question Date: 2015-12-08
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.


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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