galaxy a10 Why Isn't It Light At Night? - Sciencey

Scientists estimate that the universe contains over a trillion galaxies, and that each galaxy contains about 100 billion stars. So how come their combined light doesn't illuminate the night sky? Featuring Professor Alan Duffy.

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galaxy a10 Why Isn't It Light At Night? - Sciencey
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Science & Technology	Upload TimePublished on 6 Dec 2017

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