• The most direct evidence of a big bang event is from Hubble's Law, which models how astronomical objects move away from the Earth at a rate proportional to their distance. This means that everything in the universe, at a large scale, is moving outwardly from a singular point somewhere. Astronomers can observe the velocity of fast-moving luminous objects through redshift, the phenomenon in which light is doppler shifted more red if objects are moving away from the observer or more blue if objects are moving toward the observer. If there was a big bang even, then objects would be much more commonly redshifted than blue shifted, and, in fact, our observations show that almost every object is redshifted. Astronomers can observe the parallax of not-so-distant astronomical objects (nearby stars up to several hundred light-years away), and the parallax-calculated distances agree with the distances given by Hubble's Law and redshift to an extraordinary degree. Other evidence includes the cosmic background radiation, the relative abundance of primordial elements to heavier elements, radiometric observations of other stars and how objects appear to be developed based on their distances from Earth (and therefore how long light takes to reach us), and several other smaller points that would be too difficult to detail in answerbag format.

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