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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 |