Astronomy Crossword Puzzle

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Across
  1. 7. The force that pulls objects together
  2. 8. The first stage in a star's life
  3. 9. Matter that doesn't give off electromagnetic radiation
  4. 11. A bright, distance galaxy that has a giant black hole in the middle
  5. 13. A system in which the sun is at the center
  6. 15. All of space and everything in it
  7. 16. When an object resists any change in its motion
  8. 18. The apparent change of an object when seen from different places
  9. 21. The actual brightness of a star if it were at a standard distance from Earth
  10. 23. When two objects move around each other
  11. 24. A rapidly spinning neutron star that gives off radio waves
Down
  1. 1. An object that has such a great gravitational pull that nothing can escape
  2. 2. A large group of stars, star systems, star clusters, dust and gas bound together by gravity
  3. 3. The leftover core of a star from which the outer layers have drifted off into space
  4. 4. The explosion that expanded and formed the universe
  5. 5. Made up patterns in the sky formed by stars
  6. 6. The system model in which the Earth is placed in the center
  7. 10. The building blocks of planets
  8. 12. The brightness of a star as seen from Earth
  9. 14. One of the two final stages in a high-mass star's life
  10. 17. Where all stars begin their lives
  11. 19. The spinning motion of a planet on its axis
  12. 20. year The distance light travels in one year
  13. 21. The study of the moon, stars, and other objects in space
  14. 22. The explosion of a dying supergiant star