Astronomy Crossword Puzzle

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Across
  1. 4. The action of a body rotating on its axis
  2. 7. Outermost planet in the Milky Way.
  3. 9. Seventh planet from the sun and the third largest planet in our solar system.
  4. 12. Second largest planet in the solar system, contains long rings.
  5. 14. The model of the Milky Way used today.
  6. 15. Region of space between the orbits of Mars and Jupiter that contains many irregularly shaped bodies.
  7. 17. Region of icy bodies, comets, and dwarf planets that extends from Neptune's orbit.
  8. 18. Average distance between the Sun and Earth.
  9. 19. Planet closest to the Sun, halfway between the Sun and Earth.
  10. 20. "The Red Planet", composed of volcanic rock.
Down
  1. 1. Outer planets.
  2. 2. Earth's natural sattelite.
  3. 3. What attracts bodies together based on mass and distance.
  4. 5. Earth's "twin".
  5. 6. Inner planets.
  6. 8. The planet with the largest mass.
  7. 10. A complete orbit made around another body.
  8. 11. The only planet in the Milky Way that can support life.
  9. 13. The model of the Milky Way with Earth in its center.
  10. 16. Path of a body going around another.