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| the name often given to the four inner planets: Mercury, Venus, Earth, and Mars |
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| the trapping of heat by a planet's atmosphere |
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| the name often given to the first four outer planets: Jupiter, Saturn, Uranus, and Neptune |
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| a loose collection of ice, dust, and small rocky particles, typically with a long, narrow orbit |
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| rocky objects revolving around the sun that are too small and numerous to be considered planets |
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| the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found |
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| a chunk of rock or dust in space |
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| a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere |
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| a meteoroid that passes through the atmosphere and hits Earth's surface |
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| a thin disk of small ice and rock particles surrounding a planet |
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| a spherical region of comets that surrounds the solar system |
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| the fuzzy outer layer of a comet |
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| the solid inner core of a comet |
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| a doughnut-shaped region that stretches from around Pluto's orbit to about 100 times Earth's distance from the sun |
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