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Nearly a decade before Hubble took to the telescope, Albert Einstein proposed a theory called the Cosmological Constant in tandem with his theory of general relativity. The idea being that the universe was a static place and the density remained constant. When Einstein saw Hubble’s news about the redshifting galaxies he threw this theory away, except Einstein was sort of right, go figure. The universe is not a static place — we know it’s expanding rapidly, but the density in the universe still remains constant.

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