Solar System

3. a natural or artificial body that revolves around a planet
5. a small, rocky object that orbits the sun, usually in a band between the orbit of Jupiter and Mars
7. Any of the nine primary bodies that orbit the sun; a similar body that orbits another star
9. an object so massive and dense that not even light can escape its gravity
10. a accumulation of matter
12. a model for the formation of the solar system in which the sun and planets condense from a cloud (or nebula) of gas and dust
14. a collection of stars, dust and gas bound together by gravity
17. a gigantic explosion in which a massive star collapses and throws its outer layers into space; plural supernovae
18. a large celestial body that is composed of gas and emits light; the sun is a typical star
20. one of the highly dense planets nearest to the sun; Mercury, Venus, Earth, and Mars
21. the distance that light travels in one year; about 9.5 trillion kilometers

1. a small, hot, dim star that us the leftover center of an old star
2. the change in the illuminated area of one celestial body as seen from another celestial body;phases of the moon are caused by the position of Earth,the sun,and the moon
4. a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune
6. an event in which the shadow of one celestial body falls on another
8. contains the sun and all of the planets and other bodies that travel around in it
11. a large, reddish star late in it's life cycle
13. a group of stars bound by gravity
15. the portion of Earth that is water
16. a small body of ice, rock, and cosmic dust loosely packed together that follows an elliptical orbit and that gives off gas and dust in the form of a tail as it passes close to the sun
19. a large cloud of dust and gas in interstellar space; a region in space where stars are born or where stars explode at the end of their lives