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| a model of the universe in which Earth is at the center of the revolving planets and stars |
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| a model of the solar system in which Earth and the other planets revolve around the sun |
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| an oval shape, which may be elongated or nearly circular |
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| a natural satellite that revolves around a planet |
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| the process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and other gases that form a “blanket” around Earth |
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| the name often given to the first four outer planets |
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| a thin disk of small ice and rock particles surrounding a planet |
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| a loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit of the sun |
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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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| life that exists other than that on Earth |
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