Gravity and Stars Crossword

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Across
  1. 7. the last stage of a dying star
  2. 10. the attraction between objects
  3. 12. a galaxy shaped like a spiral
  4. 13. how bright an object appears in the sky from Earth
  5. 14. a dying star that becomes massive
  6. 16. a cloud of dust and gas that develops into a star
  7. 18. a place where gravity is so strong that even light can't escape
  8. 21. how bright an object is viewed from 10 parsecs away
  9. 22. a star that is gravitationally bound to another
  10. 23. the amount of matter in an object
  11. 24. neutron stars that emit pulses of radiation in regular intervals
  12. 25. the method used to classify stars
Down
  1. 1. the complete range of all types of radiation
  2. 2. dust and gas left over from a dying star
  3. 3. a ball of ice and gas orbiting the sun
  4. 4. an asteroid that burns up in the Earths atmosphere
  5. 5. a star that emits X-rays
  6. 6. the brightest star in the sky
  7. 8. when two nuclei join together
  8. 9. a super massive black hole that feeds on gas
  9. 11. the difference in appearance of an object viewed from a different point
  10. 15. the explosion of a star
  11. 17. small rocky and metallic objects orbiting the sun
  12. 19. the tendency of matter to remain unchanged
  13. 20. a group of stars that forms an image