Science Final

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Across
  1. 5. object whose gravity is so great that no light can escape
  2. 8. spreads light into different wavelengths
  3. 14. the shift to a different wavelength
  4. 15. measure of how bright an object appears from Earth
  5. 16. a cloud of gas and dust
  6. 17. matter that emits no light
  7. 19. the distance light travels in one year
  8. 20. where hot gas moves up towards the surface and cooler gas moves deep into the interior
  9. 21. the true brightness of an object
Down
  1. 1. the surface of a star
  2. 2. a shell of cooler hydrogen surrounding a stars core
  3. 3. orange-red layer above the photosphere
  4. 4. huge collections of stars
  5. 6. the average distance betweem Earth and the Sun
  6. 7. wide outermost layer of a stars atmosphere
  7. 9. when nuclei of several atoms combine into one larger nucleus
  8. 10. enormous explosion that destroys a star
  9. 11. star dense core of neutrons that remains after a supernova
  10. 12. theory on how the universe is constantly expanding
  11. 13. large ball of gas held together with a hot core
  12. 18. hot dense slowly cooling sphere of carbon