We see a photo of the night sky with the Milky Way clearly visible. A silhouette of a person is standing at the centre, on the floor. The person is looking up.

Physics, Secondary ed level, Tutorial

Just a minute: how big is the universe?

In case your child asks how big the universe is, this is something you quickly might want to read. Continue reading Just a minute: how big is the universe?

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KJ Runia2019-03-232020-07-02