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7th Solar System
| Term | Definition |
|---|---|
| solar system | a group of planets and other bodies that revolve around a star |
| moon | any natural satellite of a planet |
| Oort cloud | Giant spherical shell surrounding everything in our solar system |
| Sun | a medium-sized star that's the center of our solar system |
| meteor | a small body of matter from outer space that enters the earth's atmosphere, produces a bright light due to friction and appears as a streak of light |
| asteroid | a small rocky body orbiting the sun |
| comet | a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun |
| Kuiper belt | a region of the solar system beyond the orbit of Neptune, believed to contain many comets, asteroids, and other small bodies made largely of ice |
| gravity | an attractive force that occurs between two masses; determines the motion of everything in our solar system |
| habitable zone | the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of a planet |
| planet | rocky or gaseous object that orbits a star and enough gravity to make it spherical; |
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