Across
- 2. celestial object orbits Sun in an elongated path
- 5. body lacking criteria to be small planet
- 9. circumstellar disc beyond planets
- 10. small rocky body orbiting the sun
- 12. body that would become meteor if entered Eart's atmosphere
- 13. rocky planet make of metals and rocks
- 15. shell of icy objects in solar system
- 16. icy bodies orbiting sun in Kuiper Belt
- 17. center of earth to center of sun
- 18. nebulous envelope around nucleus of comet
Down
- 1. body enters Earth's atmosphere as streak of light
- 3. planet made of gas and rocky core
- 4. narrow tail of a comet
- 6. orbital movement same as other bodies
- 7. center part of most cells
- 8. all planets orbit sun counterclockwise
- 11. meteor that survives passage into Earth's atmosphere
- 14. ring orbiting dust or moonlets