1					2					3
4									5
			6						7			8
9
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			11
	12					13
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				15						16
		17				18								19				20
21
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Across 1. Planet with its axis almost level with its orbit. 5. Heavenly body that orbits the sun. 7. Hot and cold planet closest to the sun. 9. Force that keeps an object moving in a straight line. 11. Planet with clouds containing sulfuric acid. 12. Planet-like rock between Mars and Jupiter. 18. (2 words) Orbits the sun ourside the earth's orbit. 21. Rock from space that strikes the earth's surface. 22. Forms a tail as it nears the sun in an oblong orbit.

Down 2. Planet surrounded by large flat rings. 3. Orbits the sun inside the earth's orbit. 4. Path of a planet or satellite. 6. Pull between heavenly bodies. 8. Lining up that makes planets appear close together. 10. In a backward direction. 12. Line around which a planet rotates. 13. Position of a superior planet when it is in the direction opposite from the sun. 14. Largest planet; next one after Mars. 15. Streak made as speeding rock enters the atmosphere. 16. Passing of a planet in front of the sun. 17. Next to the last planet; discovered by mathematics. 19. Smallest planet; last one to be discovered. 20. Oval shape of the orbits of planets> 21. Red planet with seasons like the earth.