Across
- 5. the theory that states the universe began with a tremendous explosion 13.7 billion years ago
- 6. a group of stars that are close together relative to surrounding stars
- 8. the brightness of a star as seen from the Earth
- 14. an apparent shift in the position of an object when viewed from different locations
- 16. a tight group of stars that looks like a ball and contains up to one million stars
- 19. the study of origin, properties, processes, and evolution of the universe
- 20. the band of color produced when white light passes through a prism
Down
- 1. the location on the H-R diagram where most stars lie
- 2. a rapidly spinning neutron star that emits rapid pulses of radio and optical energy
- 3. a star that has collapsed under gravity
- 4. the brightness that a star would have at a distance of 32.6 light-years from Earth
- 7. a gigantic explosion in which a massive star collapses and throws its outer layer into space
- 9. a large, reddish star late in its life cycle
- 10. a large cloud of dust and gas in interstellar space
- 11. a small, hot, dim star that is the leftover center of an old star
- 12. a collection of stars, dust, and gas bound together by gravity
- 13. a very luminous, star-like object that generates energy at a high rate
- 15. Hertzsprung-Russell diagram
- 17. the distance that travels in one year
- 18. an object so massive and dense that even light can't escape its gravity