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27 Cards in this Set
- Front
- Back
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geocentric
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a model of the universe in which the earth is in the center
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heliocentric
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a model of the universe in which the sun is in the center
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ellipse
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an oval shape which may be elongated; the shape of a planet's orbit
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terrestrial planets
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the name often given to the 4 small inner rock planets (Mecury, Venus, Earth, Mars)
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greenhouse effect
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trapping of heat by a planet's atmosphere
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atmosphere
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the air (or gases) surrounding a planet
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gas giant
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the name for the 4 outer planets (Jupiter, Saturn, Uranus, Neptune)
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ring
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a thin disk of ice and rock particles surrounding a planet
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comet
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a loose collection of ice dust and rocky particles with a long, narrow orbit
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nucleus
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the core of a comet, planet, et cetera
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asteroid
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rocky objects revolving around the sun that are too small and numerous to be planets
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asteroid belt
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the region of solar system between Mars and Jupiter with many asteroids
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meteoroid
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a chunk of rock or dust in space
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meteor
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a streak of light in space produced when a meteorite passes through Earth's atmosphere
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meteorite
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a meteor that passes through Earth's atmosphere
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Mercury characteristic
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closest to Sun,
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Venus characteristic
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thick atmosphere
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Earth
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human life, liquid water
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Mars
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red
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Jupiter
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storm
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Saturn
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rings
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Uranus
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90 degree tilt
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Neptune
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cold, blue planet
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How did asteroids form?
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an early solar system that never developed
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What are the main sources of meteoroids?
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Comets and asteroids
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How does a comet's appearance change as it approaches the Sun?
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gases and dust are released from the comet because of the Sun's energy
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Twin Planets
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Venus and Earth
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