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earth
earth, sun, and moon words
| Term | Definition |
|---|---|
| Astronomy | The study of the moon, stars, and other objects in space. |
| Axis | Imaginary line that passes through Earth's center and the north and south poles |
| Rotation | Spinning of Earth on its axis. |
| Revolution | The movement of one object around another. |
| Orbit | A path. |
| Solstice | When the sun is farthest North or South of the equator. |
| Equinox | Neither hemisphere is tilted toward or away from the sun |
| Gravity | Forces that attract all objects all objects toward each other |
| law of universal gravitation | Every object in the universe attracts every other object |
| Mass | The amount of matter in an object |
| Weight | A measure of the force of gravity on an object. |
| Inertia | The tendency of an object to resist any change in its motion. |
| Newton’s First Law of Motion | an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction |
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