Astronomy word puzzle

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