4 - 02 Solar System Models

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Last updated 11:33 AM on 6/5/26
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12 Terms

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Planet

A celestial body moving in orbit around a star, which is spherical in shape, and has enough mass to clear its orbit of other similar sized bodies. Earth is a planet.

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Natural Satellite

A naturally existing celestial body that revolves around a

planet.

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Geocentric

A model which places Earth at the center of the Universe.

<p>A model which places Earth at the center of the Universe.</p>
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Heliocentric

A model which places the sun as the central object in the solar system.

<p>A model which places the sun as the central object in the solar system.</p>
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Aristotle

Greek philosopher who promoted geocentrism.

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Eratosthenes

North African librarian who calculated the circumference of the Earth using geometry and shadows.

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Ptolemy

Greek Mathematician who formalized the geocentric model.

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Copernicus

Polish astronomer who promoted heliocentrism.

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Tycho Brahe

Danish astronomer who made meticulous observations of planetary movement and catalogued over 1000 stars.

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Galileo

Italian polymath who improved the design of the telescope and used his observations to prove heliocentrism.

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Kepler

German astronomer who developed the laws of planetary motion.

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Newton

English mathematician who developed calculus and the Laws of Motion.