Stars

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Across
  1. 2. A small dense star like a white dwarf
  2. 5. What stars burn through nuclear fusion
  3. 7. A spinning neutron star that emits beams
  4. 9. The measure of a star's brightness
  5. 10. An extremely dense collapsed star
  6. 11. A star that suddenly increases in brightness
  7. 13. A massive stellar explosion
  8. 15. A system of two stars orbiting each other
  9. 16. The light signature revealing star composition
  10. 17. A recognizable star pattern
  11. 18. The apparent flickering of starlight
  12. 19. A young star still forming
Down
  1. 1. A sudden burst of stellar energy
  2. 3. The outermost layer of a star's atmosphere
  3. 4. The star at the center of our solar system
  4. 6. The total energy a star radiates
  5. 8. An extremely bright active galactic nucleus
  6. 12. The size measurement of a star
  7. 14. A very large star like a red giant
  8. 17. A group of stars held together by gravity