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Aristotle’s Cosmology• Cosmology= study of the cosmos (universe)• The earth is the center of the universe• Planets, sun and moon revolve around the
earth.• Stars are fixed to a “crystal sphere” which
rotates around the earth.• Celestial objects (sun, moon, planets, stars)
are perfect and immutable (no change)
Lunar Landscape
• Mountains and valleys just like on earth.• Earth might not be unique• Moon was not perfect like a celestial object
should be
Moons of Jupiter
• “Stars” revolving around Jupiter• Other objects could have “moons”• Moons were not left behind• Here was something that did not revolve
around the earth!