Question

What is the universe expanding into??​

Answer 1

Answer:

The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time. It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it.

Answer 2

Answer:

The universe isn't expanding into anything, it is just expanding. The universe has no edge. When we imagine the universe expanding after the big bang, we imagine an explosion, with a spray of matter coming from a single point.

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