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Across 3. gas on Neptune and Uranus that causes the blue/green color 4. region that surrounds the ss and extends halfway to nearest stars 10. visible surface of the sun 11. model of the solar system that is sun centered 13. outer atmosphere of the sun 15. giant storm on Jupiter 16. largest moon of saturn 17. most volcanically active place in the SS 19. model of the solar system that is Earth centered 20. the closest star to our solar system 22. process the sun uses to create energy 26. rain on Venus has a large quantity of this acid 30. our sun is this colored star 31. developed 3 planetary laws 32. from Egypt, said celestial bodies travel at constant speeds in perfect circles 36. Greek philosopher thought Earth was center of the SS 38. planet with a density less than water 39. collection of large and small bodies that orbit our sun 41. second largest planet 43. our galaxy 44. hot, dense core of matter that remains after the collapse of a low-mass star 46. with improved telescopes, he found 4 moons of Jupiter 47. spherical body that orbits the sun 48. Milky Way is this type of galaxy 49. gigantic explosion in which a high-mass star throws the outer layer into space 50. a neutron star that rotates and emits a beam of electromagnetic radiation 51. space and all matter and energy in it

Down 1. invisible object with gravity so great that nothing can escape it 2. color of star that is the hottest 5. middle part of the atmosphere of the sun 6. largest canyon in our SS 7. Polish astronomer, model of heliocentric SS with orbits in perfect circles 8. small, incredibly dense ball of closely packed neutrons 9. storm that used to exist on Neptune 10. huge loops of relatively cool gases that extend outward from the photosphere of the sun 12. known as Earth's twin 14. Greek astronomer and mathematician, first to propose a heliocentric model, but not widely accepter 18. element found on Mars that gives it the rusty orange color 21. one of Earth's characteristics that make it habitable by life 22. large cloud of gas and dust 23. largest volcano in our SS 24. largest planet 25. distance light travels in one year 27. moon of Neptune that is falling toward Neptune and will eventually crash into it 28. planets with a rocky surface 29. planet that spins on its side 31. region of the SS that begins after Neptune and contains 4 dward planets 33. smallest planet 34. large collection of stars, gas, and dust held together by gravity 35. planets with thick atmosphere made of gas 37. dark areas on the surface of the sun that is cooler than other areas 40. Venus has over 168 of these large structures 42. moon of uranus 45. the rovers Spirit and Opportunity collected data on this planet