Across
- 4. natural object that revolves around a planet
- 5. spacecraft that gathers data without a crew
- 6. large, round object that does not revolve around the sun
- 8. 4 planets closest to sun
- 11. rocky mass revolving the sun
- 12. one full spin on its axis
- 13. the path an object takes as it revolves
Down
- 1. one full orbit around the sun
- 2. explosion that erupts waves of particles
- 3. group of stars that form a pattern
- 7. imaginary line around which an object spins
- 9. large, round object that revolves around the sun
- 10. frozen mass of ice and dust
- 13. 4 planets farthest from sun