As predicted, Galaxies are diverging like dots on a balloon (i.e. diverging with a velocity proportional to their distance). We know this because…
• …Their spectral light is redshifted (away-moving), and more red per distance.
“In 1929 Edwin Hubble collated about 40 results for the red shift measurements in the spectra of galaxies and published his famous law: the velocity at which a galaxy is moving away is directly proportional to its distance from us”
This is relevant because, “Of all the great predictions that science has ever made over the centuries, was there ever one greater than this, to predict, and predict correctly, and predict against all expectation [from General Relativity] a phenomenon so fantastic as the expansion of the universe?” [John Wheeler, “Beyond the Black Hole.” In H. Wolf (ed.), Some Strangeness in the Proportion (Addison-Wesley, 1980), 354.]
There is a “Cosmic Microwave Background Radiation” with gas-like distribution (i.e. Radio telescopes can measure a faint background noise throughout the universe, and the pattern of this glow very specifically matches that of a uniformly distributed hot gas that expanded to the size of the universe.)1 This is relevant because it uniquely fits an inflationary model wherein all space and matter was condensed into a small area of hot energy that rapidly expanded.
There is an abundance of helium-4, and traces of deuterium, helium-3, lithium-7. This is relevant because this highly specific profile was essentially predicted by the Big Bang model.1