eli5:with billions of stars emitting photons why is the night sky not bright?
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“Space is big. REALLY **BIG**. You just won’t believe how mind-bogglingly huge it is!” …It’s so big that some stars are so far away from us that their light hasn’t had time to reach us in the billions of years the universe has existed, even traveling at the speed of light. And, the universe is expanding. So, those distances are only getting bigger. So, the light from some distant stars will NEVER reach us.
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