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Definition
| an Earth- centered model of the universe |
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Term
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Definition
| a sun-centered model of the universe |
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Definition
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Definition
| a star and all the objects that orbit it |
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Definition
| the average distance between the Earth and the Sun |
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Definition
| a object that is round, orbits the sun, and has cleared its orbit of smaller objects |
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Definition
| an object that is round and orbits the sun |
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Definition
| small bodies formed by rock and ice |
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Term
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Definition
| central region of the sun |
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Definition
| process by which hydrogen atoms join together to form helium |
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Definition
| a region of very tightly packed gas where energy move mainly in the form of electromagnetic radiation |
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Definition
| the outermost layer of the sun's interior |
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Definition
| the inner layer of the sun's atmosphere |
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Definition
| the middle layer of the sun's atmosphere |
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Term
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Definition
| the outer layer of the sun's atmosphere |
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Definition
| streams of electrically charged particles that comes from the sun |
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Definition
| areas of gas on the sun's surface that are cooler than the gases around them |
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Definition
| huge loops of gas that link sunspot regions |
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Definition
| eruptions of gas into space caused by connecting loops in sunspot regions |
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Definition
| the inner planets; small, dense, and have rocky surfaces |
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Definition
| trapping of heat by the atmosphere |
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Definition
| the outer planets; larger and more massive than Earth; do not have solid surfaces |
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Definition
| a thin disk of small particles of ice and rock |
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Definition
| a region of the solar system between Mars and Jupiter |
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Definition
| the region beyond Neptune's orbit to 100 AU |
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Definition
| extends from the edge of the Kuiper belt to 1000 AU |
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Definition
| loose collections of ice, dust, and small rock particles whose orbits can be very long, narrow ellipses |
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Definition
| clouds and dust that form a fuzzy outer layer to a comet |
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Definition
| the solid, inner core of a comet |
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Definition
| rock objects that are too small to be considered planets |
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Definition
| chunks of rock or dust small than asteroids |
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Definition
| a meteoroid in Earth's atmosphere |
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Term
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Definition
| meteoroids that reach Earth's surface |
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