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27 Cards in this Set
- Front
- Back
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orbit
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circle around something due to gravity
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astronomy
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the study of creation beyond our atmosphere
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solar system
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includes the sun and all the natural orbiting objects
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astronomers
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people who study the heavenly bodies and the laws that govern those motions
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Aristotle
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popularized the idea that the earth was geocentric
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geocentric
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earth-centered
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Ptolemy
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adopted and expanded Aristotle's geocentric
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Aristarchus
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proposed that the earth orbits the sun
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Almagest
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Ptolemy's book using detailed diagrams and mathematical data
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Copernicus
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proposed a heliocentric system
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heliocentric
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sun-centered system
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Galilei
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proved that Venus has phases which gave important evidence in the effort of popularizing a heliocentric system
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Kepler
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goal was to find "mathematical harmonies in the mind of the Creator"
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Brahe
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the excellent observer of the heavens assisted by Kepler
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ellipses
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symmetrical ovals that Kepler discovered was the path of the planets
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Kepler
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came up with the laws of planetary motion
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perihelion
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the point when the earth is closest to the sun
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aphelion
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the point when the earth is farthest from the sun
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astronomical units
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the approximate distance between the earth and the sun
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Sir Isaac Newton
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came up with the law of universal gravitation
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nebular hypothesis
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the idea where a cloud of gas and dust began collapsing inward and rotating creating the solar system
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vacuum
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space that does not contain any matter
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planets
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wanderers
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Mercury
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the speediest planet
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Venus
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the planet known as the morning and the evening star
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Venus
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the only planet that takes longer to rotate on its axis than it does to orbit the sun
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retrograde
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moving backward from east to west
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