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Jesuit priest Georges LeMaitre did not "know about" Big Bang Cosmology, he invented the hypothesis. He did so after studying the mathematical equations of general relativity, and noting that they did not permit a Universe of infinite age and unchanging density. Like Alexander Friedmann (the two did their work independently), LeMaitre noted the only permitted solution was a Universe of increasing density (ie, one that is contracting) or decreasing density (expanding). Whereas Friedmann only noted that the math gave these two solutions and made no attempt to discern which was true about our Universe, LeMaitre proposed that our Universe was, indeed, expanding. He also speculated that this fact would explain the red shift of distant nebulae, as well as the presence of cosmic rays. Note that one of his speculations was completely right, and one was completely wrong.

LeMaitre later revised his hypothesis into one with a "cosmic egg" and "a day without yesterday" -- a hypothesis later described as having a "Big Bang."

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12y ago
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13y ago

He was born in 1884 and published his first paper on the subject in 1927.

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