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| An object that moves around another object in space; the moon is a satellite of Earth. |
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| The path that an object such as a planet makes as it revolves around a second object. |
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| One of the different shapes of the moon seems to have as it orbits around the Earth. |
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| The movement of any object in orbit, such as Earth moving around the sun. |
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| An imaginary line that runs through both poles of the Earth. |
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| The motion of a planet or other object as it turns on its axis. |
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| A group of objects in space that move around a central star. |
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| A huge, burning sphere of gases; for example the sun. |
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| A large object that moves around a star. |
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| A small rocky object that moves around the sun. |
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| A small mass of dust and ice that orbits the sun in a long, oval-shaped path. |
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| Planets which are large spheres made up of mostly gases-for example, Jupiter, Saturn, Uranus, and Neptune. |
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| The planets closest to the sun; Mercury, Venus, Earth, and Mars |
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| The planets farthest from the sun; Jupiter, Saturn, Uranus, Neptune, and Pluto |
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