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| A measure of the pull of gravity on an object. |
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| The path one body in space takes as it revolves around another body; such as that of Earth as it revolves around the Sun. |
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The spinning of Earth on its axis. |
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| To travel in a closed path around an object such as Earth does as it moves around the Sun. |
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Definition
| The attraction due to gravitation that the Earth or another astronomical object exerts on an object on or near its surface. |
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| The repeated rise and fall in the level of the ocean. |
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