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There are zillions of stars out there. Why isn the sky completely illuminated at night?

April 26, 2017completely illuminated Night sky stars zillions

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There are zillions of stars out there. Why isn the sky completely illuminated at night?

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The puzzle as to why the sky isn’t illuminated at night is called “Olber’s paradox”, and the resolution of it is that the universe is expanding. We will be covering this later in the course.