astronomy

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Across
  1. 3. most comets can be found here, or in the Oort Cloud
  2. 6. An invisible line Earth spins around.
  3. 8. ____ planets: Mercuty, Venus, Earth, Mars
  4. 9. everything that has ____ has gravity.
  5. 13. Discovered three laws that describe the way that planets move
  6. 14. the life phase that our sun is currently in
  7. 16. this planet is closest to the sun
  8. 17. our solar system is in this galaxy
  9. 19. this motion creates one day
  10. 23. A measure of how far north or south a place is from the Equator.
  11. 25. an object that orbits another object
  12. 26. region between Mars and Jupiter
  13. 29. gas ____: Jupiter, Saturn, Uranus, Neptune
  14. 30. The path Earth takes around the Sun.
  15. 31. a main sequence star's fuel
  16. 34. The imaginary line around Earth at 0° latitude.
  17. 35. Explained why Kepler's laws must be true
Down
  1. 1. The amount of time a place gets sunlight in a day.
  2. 2. this process produces helium and energy in middle aged stars
  3. 4. in order for an object to remain in orbit, forces must be ____
  4. 5. the force of motion
  5. 7. One half of the Earth (Northern or Southern).
  6. 10. a collection of stars
  7. 11. a push or pull that happens when two or more objects interact
  8. 12. a space rock that has entered Earth's atmosphere
  9. 15. refers to a star's brightness on the HR Diagram
  10. 18. the final form of a medium sized star
  11. 19. this motion creates one year
  12. 20. an invisible force that pulls objects towards a body's center
  13. 21. the theory that the sun is the center of the solar system
  14. 22. this planet formed first
  15. 24. The angle (23.5°) at which Earth leans from vertical.
  16. 27. this planet is the only one that supports life
  17. 28. the final form of a supermassive star
  18. 32. increasing this will decrease one object's gravitational pull on another
  19. 33. a cloud of dust and gas that will form a star