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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; the shape of the planets' orbits |
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| the process by which hydrogen atoms join together in the sun's core to form helium |
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the central region of the sun, where nuclear fusion takes place |
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the inner layer of the sun's atmosphere that gives off its visible light |
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| the middle layer of the sun's atmosphere |
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| the outer layer of the sun's atmosphere |
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a stream of electrically charged particles that emanate from the sun's corona |
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| a dark area of gas on the sun's surface that is cooler than surrounding gases |
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| a huge, reddish loop of gas that protrudes from the sun's surface, linking parts of sunspot regions |
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an eruption of gas from the sun's surface that occurs when the loops in sunspot regions suddenly connect |
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| a region of very tightly packed gas in the sun's interior where energy is transferred mainly in the form of light |
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| the outermost layer of the sun's interior |
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