Across
- 2. Red planet
- 4. Twinkling celestial object
- 6. Center of our solar system
- 7. Vehicle that travels to space
- 10. Cloud of gas and dust in space
- 12. Earth's natural satellite
- 14. Artificial object in orbit around a planet
- 15. Prominent constellation
- 16. Second planet from the sun
- 17. Huge collection of stars
- 18. Largest planet in our solar system
Down
- 1. Planet with rings
- 3. Rocky object orbiting the sun
- 5. Person who explores space
- 8. Spacecraft for launching and landing
- 9. Optical instrument for stargazing
- 11. Icy object with a tail
- 12. Closest planet to the sun
- 13. Unidentified flying object
- 17. Force that keeps objects grounded