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How Do You Weigh The Universe?

29 Apr 2020, 20:15 UTC
How Do You Weigh The Universe? ESA/Hubble & NASA

The weight of the universe (technically the mass of the universe) is a difficult thing to measure. To do it you need to count not just stars and galaxies, but dark matter, diffuse clouds of dust and even wisps of neutral hydrogen in intergalactic space. Astronomers have tried to weigh the universe for more than a century, and they are still finding ways to be more accurate.

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