Across
- 2. Huge explosion
- 5. The closest planet
- 11. First stage in a star's formation
- 14. what planet was discovered in 1781
- 15. Object used for communication
- 16. Inner planets composition
- 17. Natural satellite
Down
- 1. Planet with a big red spot
- 3. All matter and energy that space includes
- 4. Rock that hits the surface of earth
- 6. Icy rocky object floating in space
- 7. Huge explosion that formed the universe
- 8. Metallic rocky object in space
- 9. Gas and dust that forms into a star
- 10. Our former 9th planet
- 12. Neptune's biggest moon
- 13. celestial object with rings