Why is the night sky dark? A science lesson.


Why is the sky blue? Why does water evaporate at room temperature? Why does the moon have phases?

Do you know?

I think there are some basic science questions that everyone should be able to answer. A lot of these are covered in basic science classes. But maybe you didn’t cover them in class. Or maybe you forgot. Or maybe you didn’t quite understand it correctly back then. I was reminded recently that the latter case may be more prevalent than we think.

So today I thought I’d share an explanation of one that perhaps hasn’t crossed your mind recently: why is the night sky dark?

olbers-paradox
Really, though. Scientists claim there’s pretty much an infinite number of stars out there. Where are they all? Why don’t they fill the sky? Is it all a lie?

This problem is known in astronomy as Olber’s Paradox. Before I go sharing the answer, pretend to be a scientist and take a minute to think about it.

Done?

Okay, now watch this MinutePhysics video to check your answer. And if you’re looking to brush up on some of your other basic science knowledge, check out some of their other videos.

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