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Across 2. A planet not large enough to be a planet. 4. A gaseous envelope surrounding a planet 7. A planet composed chiefly of hydrogen and helium. 8. Earth's sister planet. 9. The orbiting of one heavenly body around another. 11. A warm temperature. 12. The area beyond Earth's atmosphere. 14. Turning around on a axis. 15. A chilly temperature. 17. A cold planet tilted almost parallel. 19. A planet where daytime temperatures can reach up to 450*C. 21. "The Red Planet" 22. The only habitable planet. 23. The force of attraction.

Down 1. Representing the earth as distinct from other planets. 3. A planet with partial rings called "ring arcs". 5. A natural sattelite. 6. The line which a rotating body turns. 10. The planet Mars is _______. 12. A visible collection of gas in the air. 13. Found around Saturn. 16. A planet that is less dense than water and has an intricate ring system. 18. A gas giant with 16 known moons. 20. The curved path of a planet or sattelite around a celestial body.