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Space Quiz 1
Earth in Space and Gravity and Motion
Term | Definition |
---|---|
astronomy | the study of the moon, stars, and other objects in space |
axis | the imaginary line that passes through Earth's center and the North and South poles, 23.5% |
rotation | the spinning of Earth on its axis, 24 hours in a day |
revolution | the movement of one object around another, 365.25 days in a year |
orbit | the path of Earth as it revolves around the sun |
calendar | a system of organizing time that defines the beginning, length, and divisions of a year |
solstice | the two days out the year when the sun is farthest north or farthest south of the equator, causes shortest or longest daylight, summer and winter |
equinox | the two days out of the year when the noon sun is directly overhead and everywhere on Earth gets about 12 hours of daylight, autumnal and vernal |
force | a push or a pull |
gravity | the force that attracts all objects toward each other |
law of universal gravitation | states that every object in the universe attracts every other object |
mass | the 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 | says that an object at rest will stay at rest and an object in motion will stay in motion |