What is Cosmic Expansion?

What is Cosmic Expansion?

Cosmological Redshifts result from the expansion of space between us and a distant galaxy or quasar. Space is expanding everywhere, so the more distant an object is, the more rapidly it appears to be moving away. According to Hubble's Law. The dominant motion in the universe is the smooth expansion known as Hubble's Law. This is referred to as the "cosmic velocity dispersion" or "cosmic scatter" and is probably due to the fact that the gas clouds that formed the galaxies all had some small additional motion of their own.

Dr. Wendy Freedman determined space to expand at 72 kilometers per second per megaparsec - roughly 3.3 million light years - meaning that for every 3.3 million light years further away from the earth you are, the matter where you are, is moving away from earth 72 kilometers a second faster. In a closed universe, gravity eventually stops the expansion of the universe, after which it starts to contract until all matter in the universe collapses to a point, a final singularity called the Big Crunch, the opposite of the Big Bang.

Hubble's law is a fundamental relation between, the recessional velocity contributed by the expansion of space and the distance to an object; the connection between Redshift and distance is a crutch used to connect Hubble's law with observations.