dec 13, 1922 - The Russian cosmologist and mathematician Alexander Friedmann
Description:
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.Added to timeline:
Date:
dec 13, 1922
Now
~ 103 years ago