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| planet closest to the Sun |
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| planet known for its rings |
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| used to be the 9th planet |
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| gas that gives the bluish planets their color |
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| has a tilted axis (almost 90 degrees) |
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| sometimes swaps position from Sun with Pluto |
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| planet where water exists as a solid, liquid and gas |
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| color is due to iron oxide |
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| a mass of frozen rock and ice |
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| a meteoroid that hits Earth |
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| a meteoroid that burns up in the Earth's atmosphere |
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| meteor or "shooting star" |
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| a piece of rock similiar to the material that makes up the planets |
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| the asteroid belt is found between these two planets |
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| the cloud of comets that surrounds the solar system |
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| fifth planet from the Sun |
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| third planet from the Sun |
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| second planet from the Sun |
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| sixth planet from the Sun |
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| scientists who came up with the Earth centered theory of the solar system |
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| scientist who discovered that planet's orbits are elliptical and their speeds change |
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| a cloud of gas that eventually could form a planet or star |
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| the part of a comet that trails the main part |
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| pieces of dust and rock from an asteroid |
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