Unit 2 Test Review

3. collections of clusters
4. Irregularly shaped rocky objects that orbit between Mars and Jupiter
7. Any object that orbits the Sun; has a spherical shape and is large enough to clear its orbit of space debris
8. Planet that appears red; most similar to Earth
13. Small planets with rocky surfaces
15. Used to measure distances across the universe; the distance light travels in a year
16. process that produces energy through the combination of nuclei of atoms
17. Planet with easily distinguishable rings
20. Planet closest to the Sun
21. collections of galaxies

1. Small spherical objects that are unable to push space debris out of its orbit
2. Planet with lots of carbon dioxide in its atmosphere; creating a really thick atmosphere
5. Made up of the Sun and everything that orbits or travels around the Sun
6. a large ball of gas that shines through the process of nuclear fusion
9. how bright a star appears from Earth
10. Large planets that are often gaseous in nature
11. A huge collection of gas, dust and billions of stars and their solar systems, all held together by gravity
12. The actual brightness of a star
14. unit Used to measure distances in the solar system;distance between Earth and Sun
18. Only planet covered with 70% water
19. Planet that possesses huge hurricane called the Great Red Spot