Question

How does the expansion of the universe make outer space a vacuum?

Answer 1

Answer:

The vacuum of outer space is not caused by the expansion of the universe, but is caused by gravity. ... There would still be things like vacuum fluctuations, gravity, and dark matter, which can't be sucked out. With that said, outer space is very close to empty compared to earth's atmosphere.

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Answer 2

Explanation:

The short answer is that it the expansion of the universe is not what makes space a vacuum. What we call a vacuum in outer space is actually caused by gravity. And when we say, 'outer space', it refers to the whole area of space that is not considered the atmosphere of planets or stars.