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| any of the nine primary bodies that orbit the sun; a similar body that orbits another star |
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| the sun and all of the planets and other bodies that travel around it |
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| a natural or artificial body that revolves around a planet |
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| the change in the illuminated area of one celestial body as seen from another celestial body; phases of the moon are caused by the changing positions of the Earth, the sun, and the moon |
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| an event in which the shadow of one celestial body falls on another |
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| one of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth |
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| the portion of Earth that is water |
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| a small, rocky object that orbits the sun; most asteroids are located in a band between the orbits of Mars and Jupiter |
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| a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune |
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| a large cloud of gas and dust in interstellar space; a region in space where stars are born |
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| a model for the formation of the solar system in which the sun and planets condense from a cloud (or nebula) of gas and dust |
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| the accumulation of matter |
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| a small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and that gives off gas and dust in the form of a tail as it passes close to the sun |
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