Bt_night_sky_final

Why is Space Dark?

The night sky isn't actually dark to begin with, according to MinutePhysics. Then why does Space at night appear dark to us? Because our universe is constantly changing and expanding, for one thing. 

MinutePhysics "sheds some light" on why the night sky is dark, and the answers aren't as simple as "But the Sun is set!" 

Image credit: Scotbot/Flickr

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