Universe Vocabulary Set 1
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13 terms
Terms | Definitions |
|---|---|
 Gravity | The force of attraction between all masses in the universe. Effected by the size and distance between objects. |
| Geocentric Model | Model of our solar system with the earth in the center. |
| Heliocentric Model | Model of our solar system with the sun in the center. |
| Universe | Everything that exists anywhere. |
| Galaxy | A collection of stars, dust, and gases. Held together by gravity. |
| Milky Way Galaxy | The Galaxy in which our solar system exists. |
| Star | Any celestial body visible (as a point of light) from the Earth at night. Usually composed of hydrogen and helium. |
| Planet | Any celestial body that revolves around a sun in a solar system. |
| Solar System | A sun with the celestial bodies that revolve around it in its gravitational field. |
| Light-Year | The measurement of how far light can travel in one Earth year. |
| Astronomical Unit | The measurement that is used to measure distances in space. It is the distance between Earth and the Sun. 150,000,000 KM |
| Universal Law Of Gravitation | Gravitational force between objects relates to their masses. As they get further away the amount of gravitation pull decreases. |
| Inverse Square Law | Energy or force varies inversely with the square of the distance between two objects. |
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