Why is there no air on the Moon?

I was asked two questions a few weeks ago and I’ve been pondering the answers ever since: Why is there no air on the Moon? And how does our air stay on Earth?

Moon Day 12
Moon Day 12

These fantastic questions got me thinking about my answers to What is air made of? and Why are there no trees on the Moon?. But neither of those quite answered these new questions. So, after much deliberation, here’s my answer!

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How bright does the moon shine?

Moon Day 12
Moon Day 12

My daughter asks lots of questions about the Moon: How big is it? Why does it change shape? How bright does it shine? And this is my attempt to answer all of her Moon questions in one go.

But first, I would like to thank my friend Alex for kindly allowing me to use his wonderful photo of the Moon to illustrate this blog post.

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