Unit 6 Vocab

2. system Sun, planets, and all the other objects that revolve around the sun
3. An object's change in position relative to a reference point.
4. a mixture of gases that surrounds a planet or moon.
6. an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit.
7. a natural satellite that revolves around a planet.
8. A typical star that is the source of light and heat for the planets in the solar system.
10. A force of attraction between objects that is due to their masses and distance.
11. process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.
12. a dark area of gas on the sun's surface that is cooler than surrounding gases.
13. A representation of an object or event
15. reddish loops of gas that link different parts of sunspot regions
16. a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
18. planet an object that orbits the sun and is spherical, but has not cleared the area of its orbit.
20. A hypothesis that has been tested with a significant amount of data

1. A push or pull exerted on an object
2. flares violent eruptions of particles and radiation from the surface of the Sun
5. A model of the solar system in which Earth and the other planets revolve around the sun
9. any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)
10. A model of the universe in which Earth is at the center of the revolving planets and stars.
11. a ball of frozen dust and rock that orbits the sun and has a tail that glows
13. A measure of the amount of matter in an object
14. The distance an object travels per unit of time
17. The spinning motion of a planet on its axis
19. unit the average distance between Earth and the sun, about 150 million kilometers