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#137 – Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe
Lex Fridman Podcast
Copernicus - Is the Sun at the Center of the Solar System?
The sun is the source of all our light and heat, Copernicus thought. But observational evidence was not better explained by a heliocentric sun-centered system. The observed positions of planets at the time in the early to mid-16th century were not a better match than Ptolemy's system.
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