geocentric universe
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What is Gravity, Anyway?
Q: What is gravity? (asked by Simon) Wow…great question. This is a question the greatest scientific minds have asked and tried to answer for centuries. It’s a question not even Stephen Hawking, the scientific genius of the century, has fully…
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Tycho Brahe, the Observer
It is surprisingly difficult to find a flattering image of Tycho Brahe. Honestly. Do me a favor and do a Google image search for the guy. It’ll come up with all sorts of disfigured images, mostly because his nose got…
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The Ptolemaic Universe
Claudius Ptolemy lived about five centuries after the Greek philosopher Aristotle’s time. Aristotle’s model for the universe — the first geocentric model, with Earth at the center — was still widely accepted, and Ptolemy sought to improve it. Ptolemy was one…
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Aristotle’s Universe
You might have heard of Aristotle. He’s the guy who said that we are what we repeatedly do. His words are often interpreted to mean that, for instance, a person who farms is therefore a farmer — or a person…
