Across
- 3. period between a new moon and full moon
- 6. people who go out in space
- 9. is the closest planet to earth and the second to sun
- 10. heat released from sun in forms of
- 11. has moon triton
- 13. closest planet to sun
Down
- 1. largest planet in our solar system
- 2. shape of ellipse
- 4. first person to use telescope to study moon
- 5. period between full moon to new moon
- 7. instrument used to study space and stars
- 8. people who study planets
- 12. biggest star in our solar system