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Across 9. Made up of 9 planets, and many smaller objects that orbit the sun. 10. 5th planet from the sun. 11. 8th planet from the sun. 13. A meteoroid that strikes Earth. 14. Composed of dust and rock particles mixed with frozen water, methane, and ammonia. 17. This was discovered in 1846. 18. An instrument that is sent to space to gather information and send it back to Earth. 20. A circular depression in a planet, moon, or asteroid that formed when an object from space hit its surface. 21. Second largets planet in the solar system. 22. Has a 248 year orbit. 23. First American spacecraft mission was sent here. 26. Sometimes called Earth's twin. 27. 4th planet from the sun. 28. A natural satelite of a planet that is held in it's orbit around a planet by the planet's gravitational pull.

Down 1. 2nd planet from the sun. 2. Called the red planet. 3. 6th planet from the sun. 4. A portion of the universe and all its componets, processes, and interactions. 5. Voyager 2 flew by in 1996. 6. A huge storm on planet Jupiter. 7. The best teacher ever!!!!! You better get this one right. 8. Galileo reached here in 1995. 12. A meteoroid that burns up in Earth's atmosphere. 15. A piece of rock that is similar to the material that formed into the planets. 16. 1st planet from the sun. 19. One astronomical unit from the sun. 22. 9th dwarf planet from the sun. 24. 3rd planet from the sun. 25. 7th planet from the sun.