Sun and Stars

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Across
  1. 2. a cloud of dust, hydrogen, helium and other ionized gases in space
  2. 3. brightness the apparent brightness of an object
  3. 5. displacement or difference in the apparent position of an object
  4. 7. a force that attracts two objects
  5. 9. an explosion of a star
  6. 10. an object that gives of its own light
  7. 13. how heavy an object is
  8. 15. energy generated by the Sun
  9. 16. the smallest and densest stars
  10. 17. a graph showing luminosity and temperatures of stars
  11. 18. a star system containing two stars
  12. 19. the distance that light travels in a year
Down
  1. 1. the resistance of any physical object to any change in its state of motion
  2. 4. a region in space time that exerts a strong gravitational force
  3. 6. extremely bright masses of energy and light
  4. 8. the process of growth or increase
  5. 9. powerful bursts of radiation
  6. 11. a graph for recording spectra
  7. 12. the remnant of a star
  8. 14. the measure of the number of atoms in an object