Intermediate Astronomy

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Across
  1. 3. The length of one rotation
  2. 5. Closest star to us
  3. 10. The name for a group or cluster of stars
  4. 12. Called the dog star, part of the constellation Canis Major
  5. 13. Famous constellation of a hunter that contains Betelgeuse
  6. 15. Was once considered a planet, now is a dwarf planet!
  7. 16. Name of a famous astronomer and telescope
  8. 18. Planets with a solid surface
  9. 21. Closest planet to the Sun
Down
  1. 1. Planets with many moons and rings
  2. 2. The path the Earth takes, as it orbits around the sun once
  3. 4. The largest planet
  4. 6. How long it takes the moon travels around the Earth
  5. 7. What the prefix "luna" means
  6. 8. WAY The galaxy we live in
  7. 9. Robot that helped us explore Mars
  8. 11. Between Mars and Jupiter where most asteroids are found
  9. 14. What is at the center of our solar system
  10. 17. Also called the little dipper
  11. 19. Third planet from the Sun
  12. 20. Are "born" and will die, made mostly of hydrogen