• The big bang theory was originally developed due to the observation of galactic redshifts in our universe. • The universe is currently expanding at a rate equal to the Hubble constant (about 70 (km/s)/Mpc. • When the universe was first formed, it was much hotter than it is now (approximately 3000 Kelvin). I was also a lot denser. • The universe’s age is inversely proportional to the Hubble constant (t ~ 1/H0 ). This age is approximately 14 billion years. • The big bang theory is based on an “expansion” of space and not an “explosion”. o An explosion would not produce a wide range of galactic velocities corresponding to the redshifts that we observe. o There is also no correlation between galactic mass and velocity that would be produced by an explosion and not an expansion of the universe. o The universe is also isotropic and homogenous on large scales. • Galaxy Survey Data o Galaxies and clusters of galaxies are arranged in a sponge-like network in space. o
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