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Which of these options is the best explanation for why the night sky is dark?
Wiki User
∙ 12y ago
The sky is very dark and scary it is a deep dark frightening sky.
Comment: That's interesting, but this question is about "Olbers' Paradox".
The answer is not simple, but is usually based on the fact that the Universe is
not infinitely old, but "only" about 13.7 billion years old.
Other important facts are that the Universe is expanding and the speed of
light is fast, but finite. The size of the "Observable Universe" is what matters. The Universe may be infinite, but all that matters is what we can, in theory, observe.
There are still some astronomers who challenge this "mainstream" explanation.
Heinrich Olbers stated the paradox in 1823. It starts by assuming that the Universe contains an infinite number of stars, distributed uniformly in space. If that were true, then in any direction out of all the possible directions a star would be visible, which means that the sky would be bright all over, all the time. Therefore, because we can see that the sky is dark, it means the original assumption can't be correct.
A Wikipedia page : "Olbers' Paradox", discusses the explanation.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoThe universe is not infinite in space
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Why the sky is dark at night?
The sky is dark at night because the Earth turns, causing one side to go into the shadow of the Earth, making the sky dark. Comment : I think this question is about "Olbers' Paradox". The answer is still a bit controversial, but most astronomers agree that the sky is dark at night because of the "Big Bang" that started our Universe. The most important facts involved in the explanation are: 1) The Universe began about 13.7 billion years ago. 2) The Universe has been expanding since it began. 3) Light has a finite speed. Look for "Olbers' Paradox" if you want a detailed explanation. In fact Wikipedia has a useful page called simply "Olbers' Paradox".
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