Stars, Galaxies, and the Universe

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