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The (Neo-)Tychonian and the Copernican/Keplerian model are actually kind of one and the same, just the location of reference changes: In the Tychonian model, you're an observer from Earth and in the Copernican you observe the system from the Sun. If you look onto the sky from Earth, you see exactly what Tycho described: The Sun and the Moon revolve around ...


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From The Unknown Universe: What We Don't Know About Time and Space in Ten Chapters by Stuart Clark: By 1998, Hawking was ready to concede the bet. He thought that although the specific evidence for Cygnus X-1 had not changed, there was now so much evidence for other black holes dotted around the galaxy an the wider Universe that there was no more room ...


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He shared the 2019 Nobel Prize "for the discovery of an exoplanet orbiting a solar-type star". It was shared with Michel Mayor. Maybe Queloz did much of the work and Mayor thought he rightfully deserved some of the credit. Queloz only got a fourth of the money because the prize was split between Mayor-Queloz and James Peebles. Peebles got his half for "for ...


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Even though it arised for historical reasons outlined in the other answers, the distinction between metals and non-metals as defined by astronomers does continue to make sense today. Metals are formed in stars and supernovas, whereas non-metals preexist stars. Therefore, the distinction is relevant when considering nucleosynthesis.


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