Science Vocab

2. theory that states the universe began with a tremendous explosion 13.7 billion years ago
3. group of stars that are close together relative to surounding stars
5. collection of stars, dust, and gas bound together by gravity
7. the band of color produced when white light passes through a prism
8. graph that shows the relationship between a star's surface temperature and absolute magnitude
10. study of the origin, properties, processes, and evolution of the universe
11. gigantic explosion in which a massive star collapses and throws its outer layers into space
13. the brightness of a star as seen from the Earth
17. rapidly spinning neutron star that emits rapid pulses of radio and optical energy
19. large cloud of dust and gas in interstellar space;p
20. a large, reddish star late in its life cycle

1. the brightness that a star would have at a distance of 32.6 light-years from Earth
4. the distance that light travels in one year; about 9.5 trillion kilometers
6. star that has colapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
9. object so massive and dense that even light can't escape its gravity
12. a small, hot, dim star that is leftover center of an old star
14. an apparent shift in the position of an object when viewed from different locations
15. the location on the H-R diagram where most stars lie
16. tight group of stars that looks like a ball and contains up to 1 million stars
18. very luminos, starlike object that generates energy at a high rate