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Why is the Night Sky Dark?
If the universe is infinite and filled with shining stars, we might expect a continuously bright sky. Why then is it dark at night?
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What Color Is the Sun?
White, yellow, or maybe even black? Simple questions to physicists often yield complex answers.
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The First Light in the Universe
Observations reveal that the first light in the universe likely originated from young and remarkably bright stars.
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The Colors of The Cosmos
How do black and white telescope photographs transform into color images?
