User:Traductoraplatense/Origen del universo
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According to Greek and modern cosmology, the origin of the universe is the instant where all the matter and energy currently existing in the universe originated as a result of a great expansion. The Big Bang Theory (great explosion) has been accepted by most scientists and posits that the universe may have been originated 13.800 billion years ago, at a definite moment.[1][2] In the 1930s, the American astronomer Edwin Hubble found proof that the universe was expanding, a phenomenon that the priest and astrophysicist Georges Lemaître described in his research on the expansion of the universe (big bang), based on Albert Einstein's equations and theory of general relativity. However, Einstein did not believe in his results since it seemed absurd that the universe was constantly expanding, so he added the famous «cosmological constant» to his equations (such constant solved the problem of the infinite expansion), to which later on he called the biggest mistake of his life. For this reason, Hubble was recognized as the scientist who discovered the expansion of the universe.