Sun and Stars

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