Cosmic expansion
= Cosmic expansion
{wiki=Expansion_of_the_universe}
Cosmic expansion is the increase of physical distances between comoving observers as the <scale factor> grows. Its instantaneous fractional rate is the <Hubble parameter>.
= Cosmic expansion
{wiki=Expansion_of_the_universe}
Cosmic expansion is the increase of physical distances between comoving observers as the <scale factor> grows. Its instantaneous fractional rate is the <Hubble parameter>.