Astronomy Crossword Puzzle

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Across
  1. 3. Stage after the White Dwarf
  2. 5. An apparatus for photographing or otherwise recording spectra
  3. 7. A region of space having a gravitational field so intense that no matter or radiation can escape
  4. 8. A small body moving in the solar system that would become a meteor if it entered the earth's atmosphere
  5. 9. A group of stars forming an imaginary image
  6. 12. The angular view of a star from different points in the earth's orbit
  7. 13. a disk-shaped region of minor planets outside the orbit of Neptune
  8. 16. A system of two stars in which one star revolves around the other or both revolve around a common center
  9. 17. A celestial object, thought to be a rapidly rotating neutron star
  10. 18. a very bright star of large diameter and low density (relative to the Sun)
  11. 22. All of space and everything in it
Down
  1. 1. A diffuse cloud of gas and dust surrounding the nucleus of a comet
  2. 2. The main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness
  3. 4. The remnant of a star that has collapsed, having an extremely dense state with no empty space between its atoms
  4. 6. A celestial object consisting of a nucleus of ice and dust
  5. 10. An explosion occuring in the lifecycle of a high-mass star
  6. 11. Belt of Asteroids
  7. 14. A spherical cloud of small rocky and icy bodies postulated to orbit the sun beyond the orbit of Pluto
  8. 15. A system of millions or billions of stars
  9. 19. A system of two stars in which one star revolves around the other or both revolve around a common center
  10. 20. A small rocky body orbiting the sun
  11. 21. Year Distance light travels