Why is the sky dark at night?

1 Answer
José F.
Feb 21, 2016

By at least one of these two reasons:

-the speed of light is not infinite (true)

  • the Universe is finite(?)

Explanation:

If the Universe were infinite, every single point in the sky would be occupied by one star. Additionally, if the light speed were infinite all the light of these stars, would reach the Earth at the same time. The nights would be brighter than the day we actually experience.

Related questions
See all questions in Astronomy Basics
Impact of this question
1439 views around the world
You can reuse this answer
Creative Commons License