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Why is the night sky dark?



In summary, essentially the sky appears dark to us because the universe is expanding. When the stars we look at are farther away, they're moving away from us faster. The faster the star moves away, the more red they appear. After they reach a certain distance away from us, the stars become infrared. Essentially the sun is the only star close enough to us to emit on the visible spectrum and diffuse through the atmosphere.

I thought this was very interesting. With a background in physics, a lot of questions tend to pop up that someone without such a background would take for granted. The sky being dark at night, with soooo many stars as bright or brighter than the sun out there, was always of mild interest to me. Hope you enjoy!


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