Structure of the Universe

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Across
  1. 3. Force which pulls based on mass and distance
  2. 7. Random small pieces of rock
  3. 8. Elliptical, spiral, or irregular
  4. 9. Where gravity is so strong not even light can escape
  5. 13. imaginary lines between stars for navigation
  6. 14. A large object revolving around the sun in the sun's orbital plane.
  7. 15. Angle from the central axis for revolution (usually close to perpendicular)
  8. 17. To spin around an axis
  9. 18. Irregular shape and rotating on more than one axis
  10. 19. The distance a photon of light can travel in one Earth year
  11. 22. Used for looking at stars
  12. 23. Frozen space object with a tail.
Down
  1. 1. Theoretical tunnel connections between distances in space
  2. 2. Imaginary line for rotation
  3. 4. Smaller objects orbiting the sun but NOT in the orbital plane
  4. 5. Where stars and galaxies are born
  5. 6. Theory of how the universe began
  6. 8. Earth is the center of everything
  7. 10. To go around another object
  8. 11. Nuclear ball of gas
  9. 12. A force which attracts or repels
  10. 16. All known matter and energy
  11. 20. Sun is at the center
  12. 21. Rocky object orbiting a planet