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13 Cards in this Set
- Front
- Back
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the average distance from Earth to the Sun
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Astronomical Unit
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an imaginary line through the center of a planet around which the planet rotates
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axis of rotation
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an oval
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ellipse
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the time it takes a planet to move completely around the sun
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period of revolution
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the time it takes for a planet to rotate once on its rotational axis
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period of rotation
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a total or partial obscuring of one celestial body by another
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eclipse
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different appearance of the Moon as it orbits Earth
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lunar phase
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an object that revolves around a planet
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satellite
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one of the four planets closest to the sun: Mercury, Venus, Earth, and Mars
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inner planet
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one of four planets beyond the inner planets: Jupiter, Saturn, Uranus, Neptue
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outer planet
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a rocky object, smaller than a planet that is found between the orbits of Mars and Jupiter
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asteroid
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a small, icy body in orbit around the Sun, often having a highly elliptical orbit
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comet
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solid, interplanetary particle passing through Earth's atmosphere
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meteoroid
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