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astronomy
| Term | Definition |
|---|---|
| astronomy | the study of the moon, stars and other objects in space |
| axis | an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates |
| rotation | the spinning motion of a planet on its axis |
| revolution | the movement of an object around another object |
| orbit | the path of an object as it revolves around another object in space |
| solstice | the two days of the year on which the sun reaches its greatest distance north or south of the equator |
| equinox | the two days of the year on which neither hemisphere is tilted toward or away from the sun |
| moon | a natural satellite that revolves around a planet |
| phase | one of the different apparent shapes of the moon as seen from Earth |
| gravity | a force that moves rocks and other materials downhill: the force that pulls objects toward each other |