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0802c - Thephysicsteacher
0802c - Thephysicsteacher

... Hydrogen is the most common element in the universe. 88% of all atoms are hydrogen atoms so there is more hydrogen than any other substance. The name comes from the two Greek words hydro and genes, which together mean ‘water-forming’. Hydrogen atoms were made in the Big Bang, when the universe is be ...
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Chronology of the universe



The chronology of the universe describes the history and future of the universe according to Big Bang cosmology, the prevailing scientific model of how the universe developed over time from the Planck epoch, using the cosmological time parameter of comoving coordinates. The model of the universe's expansion is known as the Big Bang. As of 2015, this expansion is estimated to have begun 13.799 ± 0.021 billion years ago. It is convenient to divide the evolution of the universe so far into three phases.
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