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