Earth's place in the universe | Middle school Earth and space science | Khan Academy
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Earth's place in the universe | Middle school Earth and space science | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:earth-in-space/x87d03b443efbea0a:earths-place-in-the-universe/v/earths-place-in-the-universe Early astronomers developed the geocentric model to describe ...
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