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| system of eight planets, including earth and many smaller objects, that orbit the sun |
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| four solid, rocky planets that are closest to the sun |
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| four planets that are farthest from the sun |
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| has many craters, low gravitational pull, and is the second-smallest planet in out solar system |
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| has a dense atmosphere of carbon dioxide and sulfuric acid |
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| whose surface temperatures allow water to exist as a solid, liquid, and gas and atmosphere protects life from the sun's radiation |
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| average distance from Earth to the sun, which is used to measure distances to objects in the solar system |
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| appears red due to the iron oxide content in its weathered rocks |
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| largest planet and is composed mostly of hydrogen and helium and has continuous storms of high-pressure gas |
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| high-pressure storm generated by huge thunderstorms in Jupiter's atmosphere |
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| has a complex ring system made of hundreds of ringlets |
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| large, gaseous planet that has a magnetic pole tilted 60 degrees and rotates on an axis nearly parallel to the plane of its orbit |
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| large, gaseous planet similar to Uranus |
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| mass of dust and rock particles mixed in with frozen water, ammonia, and methane and consists of a nucleus, a coma, and a tail |
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| cloud of comets that completely surrounds the solar system and that is located beyond the orbit of Pluto |
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| meteoroid that burns up in Earth's atmosphere |
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| meteoroid that does not completely burn up in Earth's atmosphere and strikes Earth |
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| piece of rock usually found in the asteroid belt between the orbits of Mars and Jupiter |
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