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Earth in Space
Key Terms
Term | Definition |
---|---|
Astronomy | The study of the moon, stars, and other objects in space` |
Axis | The imaginary line that passed through Earth's center and the North and South poles |
Rotation | The spinning of earth on its axis |
Revolution | The movement of one object around the other |
Orbit | A round path |
Calendar | A system of organizing time |
Solstice | When the sun is farthest north or south of the equator |
Equinox | 2 times a year when the noon sun is directly overhead at the equator |
force | push or pull |
gravity | Force; attraction between 2 objects in space |
law of universal gravitation | every object attracts every other object |
mass | the amount of matter in an object |
weight | the force of gravity in an object |
inertia | the tendancy of an object to resist a change in motion |
Newton's first law of motion | an object at rest will stay in rest and an object in motion will stay in motion unless acted on by a force |