13 Dez 1922 Jahr - The Russian cosmologist and mathematician Alexander Friedmann

Beschreibung:

discovers the expanding universe solution to Einstein’s general relativity field equations. The solution for a universe with positive curvature (spherical space) results in the universe expanding for a time and then contracting due to the pull of its gravity, in a perpetual cycle of Big Bang followed by Big Crunch now known as the oscillating universe theory.

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