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date: 28 November 2021

p. 475. The expanding universelocked

p. 475. The expanding universelocked

  • John Gribbin


‘The expanding universe’ investigates the expansion of the Universe. Hubble's redshift-distance relationship had already been explained by Einstein's general relativity. General relativity indentified gravity as a result of curvatures in spacetime. Einstein's theory suggests many possible universes, but none of them are static. The Universe is expanding from the Big Bang, and its age is currently estimated at 14bn years. The mediocrity of the Milky Way is based on a small sample, but increasing this sample allows us to calculate the Hubble Constant. Combining this with the estimated distance of remote supernovae has required the addition of a cosmological constant, which represents dark energy, the driving force behind universal expansion.

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