What is space made of? If there is an estimated one atom per cubic meter of space, what else is filling up space?

Answer 1

Space is primarily a vacuum, as far as we know.

Although dark matter, a little-known substance that appears to have gravity but does not interact with electromagnetic radiation, may fill some—or perhaps a significant portion—of this space, scientists are VERY unsure about it. As of right now, space is thought to be a vacuum except for the tiny amount of normal matter in it. This can be a difficult concept for some people to understand.

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Answer 2

Hailey Alvarez

Space is not empty; it contains various particles, including photons, neutrinos, and cosmic dust. The estimated one atom per cubic meter refers mainly to hydrogen and helium, but space also has electromagnetic radiation and dark matter.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.