First Quiz-15 words.
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15 terms
Terms | Definitions |
|---|---|
 astronomy | the study of the moon, stars, and other objects in space |
| axis | an imaginary line that passes through Earth's center and its North and South Poles |
| 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 |
| calendar | a system of organizing time that defines the beginning, length, and divisions of a year |
| solstice | twice-yearly point at which the Sun reaches its greatest distance north or south of the equator |
| equinox | the time when day and night are of equal length |
| force | A push or pull |
| gravity | a force of attraction between objects that is due to their masses |
| law of universal gravitation | every object in the universe attracts every other object |
| mass | amount of matter in an object |
| weight | the force of gravity on an object |
| inertia | the tendency of an object to resist a change in motion |
| Newton's first law of motion | A law of motion that states that an object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted on by an unbalanced force. |
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