Stellar Evolution
Stellar evolution is the scientific account of how stars are born, live, and die over millions or billions of years. Though no one can watch a single…
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General Relativity
General relativity is Albert Einstein's theory of gravity, published in 1915. It reimagines gravity not as a force pulling objects together but as…
The Big Bang
The Big Bang is the prevailing cosmological theory of how the universe began. It holds that the universe started about 13.8 billion years ago in an…