Astronomy word puzzle

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Across
  1. 2. is the unit of measurement equal to earths average distance from the sun
  2. 6. is a model of the solar system with planets revolving around the earth
  3. 8. is a model of the solar system with the sun in the middle
  4. 10. is the third stage of a large/massive star
  5. 11. is the force that pulls objects toward each other
  6. 12. is an explosion of a dying supergiant star
  7. 14. is the movement of an object around another object
  8. 16. is the first stage of any star
  9. 18. spinning motion of planets
  10. 20. Bang is the theory that states an explosion resulted into the creation of the universe
  11. 21. observed motion of planets for 20 years
  12. 24. is the tendency of an object to resist any change in its motion
Down
  1. 1. law is the law that states the farther away a galaxy is, the faster it is moving away
  2. 3. zone is the outermost layer of the sun’s interior
  3. 4. arranged planets around the sun
  4. 5. created 3 laws of planetary motion
  5. 7. is an imaginary pattern of stars in the sky
  6. 9. saw craters on the moon
  7. 13. created a model of the geocentric system
  8. 15. star is the small particle in the nucleus of the atom with no electrical charge
  9. 16. added epicycles to the geocentric
  10. 17. zone is the region of very tightly packed gases in the suns interior
  11. 19. sequence is the second stage of any star
  12. 22. dwarf is the fifth stage of a small/medium star.
  13. 23. hole is an object whose gravity is so strong that nothing can escape it