The Stars at Night are Big and Bright...

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Across
  1. 5. How bright an object appears from earth
  2. 7. hot dense slowly cooling sphere of carbon
  3. 8. true brightness of an object
  4. 10. explosion that destroys a star
  5. 12. huge collection of stars, gas, and dust
  6. 14. object where gravity stops light from escaping
  7. 16. layer-hot gasses move upward and then cool
  8. 19. graph that plots luminosity v. temperature
Down
  1. 1. instrument that spreads light in wavelengths
  2. 2. dense core of neutrons after supernova
  3. 3. matter that emits no light at any wavelength
  4. 4. Distance light travels in one year
  5. 6. apparent surface of a star
  6. 9. shell of cooler hydrogen above core
  7. 11. fusion when atoms combine and give off energy
  8. 13. orange red layer above photosphere
  9. 15. cloud of gas and dust
  10. 17. large sphere of hydrogen gas held by gravity
  11. 18. wide outermost layer of star atmosphere