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Across 3. come from asteroids or comets; chunks of rock and dust in space 5. the ___ ____ is a doughnut shaped region where comets come from 6. central region in sun where sun's energy is produced 9. inner layer of sun's atmosphere 11. Mars has two moons, _____ and Deimos 13. planet that has seasons just as Earth does 14. meteors that have stuck Earth's surface 16. clouds on Venus are made of _____ ______ 18. planet that has no moons;not Venus 19. fuzzy outer layer of comet 21. the outer planets called ___ __ becasue they don't have solid surfaces 24. the gas tail of a comet always points away from the ___ 26. name of Saturn's largest moon 28. solid inner core of a comet 29. planet with the greatest temperature extremes 33. the __ ____ on Venus is caused by heat being trapped in its atmosphere 34. Neptune is nicknamed the ____ Planet due to its color 36. middle layer of sun's atmosphere 38. source of all light in the solar system 39. planet made of 70% water 40. Mars is nicknamed the ____ Planet 42. Uranus has a blue-green color due to the _____ in its atmosphere 43. the atmosphere on Venus is made mostly of the gas ____ _____ 44. rocky bodies that revolve around the sun;too small to be planets 45. scientist who developed sun centered model of the solar system 48. name of the largest moon in solar system; one of Jupiter's moons 49. place where asteroids are found; in between Mars and Jupiter 50. name of Neptune's largest moon 51. this planet's nicknames include "The Evening Star" and "Earth's Twin" 52. natural satellite that orbits a planet 53. Saturn has an average density less than the density of ____

Down 1. One ___ ____ is the avg. distance between the Earth and the sun 2. eruptions of gas in space 3. planet that may have once had liquid water on it 4. outer layer of sun's atmosphere 7. all comets have a gas tail and a ____ tail 8. smallest planet 10. second largest planet 11. ____ is no longer classified as a planet 12. areas of gas on sun's surface that are cooler than areas around them 15. largest planet 17. small rocky bodies of ice and dust 20. name of the largest mountain in the solar system 22. scientist who used telescope to observe the planets in 1610 23. type of system in which planets revolve around the sun 25. ____ ____ is the process by which the sun produces energy 27. __ ___ happen when meteors are visible at least once a minute 30. shape of a comet's robit; flattened circle or oval 31. disks of ice and rock; Jupiter, Saturn, Uranus, and Neptune have these 32. inner planets are also called the __ planets; from the latin word"terra" 33. the ____ ___ ____ is the name of a storm on Neptune 35. depressions on the moon caused by meteoroids 36. the Oort ____ is a place where comets come from 37. planet hit by an object and is tipped on its side 38. stream of electrically charged particles outside of the sun 41. Earth's atmosphere is made mostly of______ and oxygen 45. name of Pluto's only moon 46. streak of light in Earth's atmosphere 47. planet in which its day is longer than its year