Aristotle and Ptolemy Philosophies
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According to Aristotle, objects on Earth have a natural place and tend to move toward it. He believed that the natural state of things was to be at rest and that heavier objects fell toward the center of the Earth because it was their natural ______.

place

Ptolemy is best known for his geocentric model of the universe, which placed the Earth at the center and proposed that the planets and stars orbited around it in complex, nested ______.

spheres

This model was widely accepted for over a thousand years until it was replaced by the heliocentric model proposed by ______.

Copernicus

Copernicus proposed a heliocentric model in which the sun was at the center, and Earth and the other planets orbited around ______.

<p>it</p> Signup and view all the answers

Tycho Brahe's meticulous and comprehensive observations of the positions of stars and planets were the most accurate of his ______.

<p>time</p> Signup and view all the answers

In 1798, British scientist Henry Cavendish conducted an experiment to determine the density of the Earth and the value of the gravitational ______.

<p>constant</p> Signup and view all the answers

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