Q
Why is space black?
A
Expert Answer
This is Olbers' Paradox: in an infinite, static universe, every line of sight should end at a star, making the sky bright. The sky is dark because: the universe is finite in age (we see only ~13.8 billion years), it's expanding (light redshifts to invisibility), and stars are not infinite.
Key Insight
This is Olbers' Paradox: in an infinite, static universe, every line of sight should end at a star, making the sky bright.
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