• Question: Hi, what is space made out of?

    Asked by vary520bark to Viviene DC, Vicky F, Martin M on 26 Mar 2025.
    • Photo: Martin McCoustra

      Martin McCoustra answered on 26 Mar 2025:

      This is an interesting question… For the most part space is a vacuum! Basically there’s little if anything there… a few atoms per cubic km. However, we know there a stars and planets and galaxies. These are made of the same types of atoms that you and I are made from.

    • Photo: Vicky Fawcett

      Vicky Fawcett answered on 27 Mar 2025:

      There is also mysterious stuff out there that we don’t know about, called “dark matter”. We can’t see dark matter, but we think it has gravity and believe it to be real because we can’t explain how galaxies form without it!

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