Why is the Sky Dark at Night ?

Because the universe is still expanding, the distant stars and galaxies are getting farther away all the time.

  • The universe was born about 13.8 billion years ago in a fantastic explosion called the Big Bang. It began at a single point and has been expanding ever since.
  • If the universe were infinitely old as well as infinitely large, it would not contain enough fuel to keep the stars shining forever and to fill up all of space with starlight. And so the night sky is dark.
  • In astrophysics and physical cosmology, Olbers’ paradox, named after the German astronomer Heinrich Wilhelm Olbers (1758–1840) and also called the “dark night sky paradox”, is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.

Night Sky

Olber's Paradox - Why is the Sky Dark at Night

Olber Paradox - Infiinite or Finite Universe

Olber''s Paradox Explanation

Earth is not facing the sun, it's why it is dark

But without the dark we never see the stars

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