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Universe
| Term | Definition |
|---|---|
| Light Year | The distance that light can travel in a year. |
| Astronomical Unit (AU) | The distance from the Earth to the Sun |
| Relative Size | Objects that are closer appear larger Objects that are farther away appear smaller. |
| Universe | All of space and everything in it |
| Galaxy | A huge system of stars, star systems, dust, and gas held together by gravity. |
| Nebula | A large cloud of gas and dust in space New stars can form inside |
| Solar System (Star System) | A star and all of the planets and other objects that revolve around it. |
| Planet | A round object that orbits a star and has cleared the area of its orbit. Can be rocky or gas. |
| Dwarf Planet | A round object that orbits a star, but has NOT cleared the area of its orbit. |
| Moon | An object that orbits a planet. |
| Comet | Small body of ice, rock, & dust that orbits the sun. Has a “tail” because the sun’s heat melts ice, & creates gas |
| Asteroid | Large rocky object that orbits the sun, usually found between Mars & Jupiter. |
| Meteor | Piece of rock that travels through space, and burns up as it enters Earth's atmosphere, making a "shooting star". |
| Weight | The amount of gravity pulling on an object (changes) |
| Mass | The amount of matter in an object (doesn’t change) |
Created by:
Stszerdy
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