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16 Cards in this Set
- Front
- Back
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Aristotle
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(384-322 B.C.) observed that the earth was a sphere by looking at a shadow. People accepted his teachings during middle ages, but then went back to thinking that the earth was flat.
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Eratosthenes
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(276-194 B.C.) Was the first to successfully establish the circumference of the earth by observing a shadow. Was EXTREMELY accurate
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Ptolemy
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(85-165 A.D.) Made a model that explained for the motion of the planets. Thought that Mars moved backwards. Added epicycles to his model.
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Copernicus
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(1473-1543 A.D.) First to believe that sun was the center of the galaxy. Uncomplicated Ptolemy's model by taking out epicycles. Created retrograde motion.
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Brahe
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(1546-1601) Made very accurate decisions about the night sky. Created the basis of Kepler's 3 laws.
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Kepler
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(1571-1630) created 3 laws
1.orbits are elliptical and sun is at 1 foci (eccentricity=D/L.) 2. Planets move throuh equal areas at equal amounts of time. 3. p2=d3 |
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Galileo
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(1564-1642) Discovered 4 moons revolving around Jupiter. Discovered sunspots and went blind. Conducted the "ramp experiment"
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Newton
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(1642-1727) discovered the force from keeping planets from moving in a straight line is gravity. Law of universal gravitation.
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Heliocentric
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Sun centered
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Geocentric
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Earth centered
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Law of Universal Gravitation
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There is a gravitational pull between every two objects. Amount of attraction depends on the mass and the distance. *big mass=larger gravitional attraction* *smaller distance= larger attraction*
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Revolution
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b.the orbiting of one heavenly body around another.
c.a single course of such movement. |
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Rotation
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a.the movement or path of the earth or a heavenly body turning on its axis.
b.one complete turn of such a body. |
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Planets from smallest to largest
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Pluto, Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn, Jupiter
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Solid Planets
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Mercury, Venus, Earth, Mars
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Gas planets
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Jupiter, Saturn, Uranus, and Neptune
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