Across
- 1. comets colliding with planets
- 4. evaporating gases that point away from Sun
- 6. halo of gas around nucleus of comet
- 9. larger in size to meteoroids
- 11. Remnants of Solar System 50 AU from Sun
- 12. rocky objects on Earth's surface
- 13. icy and rocky center of comet
- 14. points in same direction as Gastail
- 15. Icy core with two tails of gas and dust
Down
- 2. objects farther than Neptune's orbit
- 3. Pluto is one of 1,000 discovered in our Solar System
- 5. Essential acids needed to begin life on Earth
- 7. Icy planetesimals 50,000 AU from Sun
- 8. rocky objects outside Earth's atmosphere
- 10. small rocky objects inside Earth's atmosphere