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Across 1. America's team 5. first 4 planets 6. large chunk of rock traveling through space 7. protects us from UV light 8. frozen carbon dioxide 11. Halley's, appears every 75 years 13. sometimes farther away than pluto 16. Texas Ranger 18. earth-like 19. earth's twin 20. 4th planet from earth 21. largest planet

Down 2. polish scientist 3. outer olanets 4. some consider not a planet 9. axial tilt of 98 degrees 10. very low density, has broad rings 12. closest to the sun 14. can form craters on earth 15. the sun, planets, and other objects which travel around the sun 17. most volcanically active object in solar system