'In the 1920s Alexander Friedmann's math modified this 1915 theory to allow the universe to expand & contract'
Einstein\'s Theory of Relativity
COSMOLOGY: In the 1920s Alexander Friedmanns math modified this 1915 theory to allow the universe to expand & contract
In the 1920s Alexander Friedmann's math modified this 1915 theory to allow the universe to expand & contract
In the 1920s Alexander Friedmann's math modified this 1915 theory to allow the universe to expand & contract
COSMOLOGY
Einstein\'s Theory of Relativity
COSMOLOGY