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Across 3. Collapse and explosion of star 5. Where fusion takes place 7. First day of fall and the first day of spring day and night are this 13. Astronomical cloud; beginning stage of a star 14. First man made object in space 15. Imaginary plane extending from the center of the sun; all planets orbit on or near this 17. Of the stars you see in the night sky, how many are in the Milky Way Galaxy 21. Space probe used in the 70's and 80's to photograph outer planets 22. Smaller, rocky planets 26. Term used to help us remember the colors of the visible spectrum 27. All energy produced by a star 30. Everything held in orbit by the sun 32. Larger gaseous planets 37. These constellations where very important to early cultures 38. Thickest layer of sun 39. Shape of all planetary orbits 43. Hottest stars are this color 44. Direction all objects orbit sun 45. Point of orbit that is closest to the sun 48. Mirrored lenses 49. The sun's "atmosphere" 50. Our star 51. First person to build and use telescope 53. Climate will be this with fewer sunspots 54. Process stars use to produce energy 56. Early astronmers used this to help them solve many of their problems

Down 1. Stars that have started the process of fusion and are consuming hydrogen 2. Medium-sized star that will consume itself in about 10 billion years 4. Spectrum of light with slightly larger energy then visible light 6. Long wave radiation used to "listen" to the Universe 8. Developed three major laws of planetary motion 9. Doing this to your data helps get rid of errors 10. Causes seasons on Earth 11. Scientists looks for these 12. Anything that orbits Earth is in this environment 16. Point of orbit that is furthest from sun 18. Pattern formed by stars with relative proximity 19. Created by fusion and supernovas 20. Large, spherical body orbiting the sun in a cleared path 23. Radiation used to study black holes 24. Energy traveling in waves 25. Process scientists use to solve a problem 28. Clear lenses 29. Large mass of the universe not emitting known spectrums of radiation 31. Disturbances in space which can disrupt equipment on earth 33. Models often have these 34. Result from collapse of a star into very dense mass 35. Everything 36. Range of the EMS seen in a rainbow 40. This will determine the type of main sequence star that forms 41. Type of planet that has not cleared its orbit of all other objects 42. Event that happened 14 billion years ago from a very tiny amount of matter 46. These have an impact on climate but not daily weather 47. Formed due to impact of space objects 52. Average distance between the sun and earth 53. Dirty snowball in space 55. Must put this on all measurments