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16 Cards in this Set
- Front
- Back
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Revolution
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The movement of one body around the other
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Rotation
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The movement of an object around a central line
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Orbit
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The path of an object around another object
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Period
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The time it takes for an object to complete one revolution around another object.
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Aristotle
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-Geocentric model
-Eight spheres inside each other -Celestial bodies perfect in nature -Accepted for 500 years,inacurate explanation of retrograde motion and motion of celestial bodies. |
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Ptolemy
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-Geocentric
-Each planet fixed to a sphere which was fixed to another sphere. -Accepted for 1500, inacurate explanations for motion of celestial object and complex. |
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Copernicus
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-Heliocentric
-Simple way of explaining retrograde motion (when earth passes another celestial body) |
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Brahe
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An astronomer who made very careful observations of planets and stars over a long period of time.
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Galileo
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-Used a telescope
-imperfections of the moon, spots on the sun, Venus' phases, Saturn's rings, Jupiter's moons |
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Telescope
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A scientific instrument made with lens and mirrors that magnifies a faraway object
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Newton
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Scientist and mathematician whose laws helped describe the motion of objects on Earth and in space.
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Kepler
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Invented three laws of planetary motion and mathematical support for the heliocentric model using Brahe's data.
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Hubble
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Discovered other galaxies outside of the Milky Way. Observed universe expanding and created Hubble's Law to describe the rate of movement.
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Newton's law of universal gravitation
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The gravitational force between two masses is directly proportional to each massand inversely proportionalto the square of the distances between the masses.
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Kepler's laws of planetary motion
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-Planets travel in elliptical orbits with the sun at one focus
-Planets don't move at constant velocity. -The period of a planet squared is equal to the cube of its distance. |
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Ellipse
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A slightly elongated circle which is the shape of the planets' orbits.
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