Stars & Galaxies

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Across
  1. 2. very large and bright star has a hot core, used up most of its hydrogen
  2. 4. star that suddenly becomes brighter
  3. 6. rapidly spinning neutron star emits radio & optical energy
  4. 8. where most stars are found on H-R diagram
  5. 10. change in frequency when source/observer is moving
  6. 12. small hot dim star, leftover center of an old sunlike star
  7. 16. (magnitude) brightness of a star 32.6 LY from earth
  8. 17. star that collapsed under gravity, forms neutrons.
  9. 18. collection of stars, dust, a& gas bound by gravity
  10. 19. (magnitude) brightness of a star as seen from earth
Down
  1. 1. theory that supports the formation of the universe
  2. 3. very luminous object that produces energy at a high rate
  3. 5. object so massive that light can't even escape its gravity
  4. 7. distance light travels in a year
  5. 9. apparent shift in position of object when viewed from different locations
  6. 11. group of stars organized into a recognizable pattern
  7. 13. study of evolution of universe
  8. 14. cloud of dust & gas, where stars are born.
  9. 15. body composed of gas that emits light