Outer Space Crossword Puzzle

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Across
  1. 4. The closest start to our Solar System.
  2. 8. The stage where stars live the majority of their lives.
  3. 9. Our galaxy looks like a __________________ with spiral arms that spin out from a central bar.
  4. 10. A really hot ball of gas with hydrogen fusing into helium at its core.
  5. 11. is a big cloud of collected interstellar medium (gas and dust) in space.
  6. 14. A galaxy with no distinct shape.
  7. 16. The closest neighboring galaxy to ours.
  8. 19. He figured out that the orbits of planets were ellipses, not circles.
  9. 20. Type of nebula where they are reflecting the light of the stars around them.
  10. 21. Transformed our view of galaxies. He recognized that some of the fuzzy things we could see were actually galaxies.
  11. 25. This is formed when gravity causes dust and gas, in a nebula, to clump together.
  12. 26. Type of nebula where it emits or gives off their own light.
  13. 27. Type of nebula that is formed when a dying star begins to shed its outer layers.
  14. 28. Light years can also help determine __________. How old something is out in space.
  15. 29. Oval, like a racetrack, with lots of old stars.
  16. 31. The balance between gravity pulling atoms towards the center and gas pressure pushing heat and light away front eh center.
Down
  1. 1. This is an object whose gravitational pull is so strong that nothing, not even light, can escape.
  2. 2. He wanted people to identify comets properly, so he created a separate category of "fuzzy objects" that were not comets. They turned out to be star clusters, nebulae, and galaxies.
  3. 3. He wrote that the universe never began and will never end.
  4. 5. Everything in the ________________ is so far apart from each other.
  5. 6. A galaxy with a very thin pinwheel with long, curved arms of younger stars.
  6. 7. Where we live.
  7. 12. The distance that light can travel in one light year.
  8. 13. A protostar that never had enough dust and gas to achieve a temperature hot enough to ignite fusion.
  9. 15. What causes a star to die in the end.
  10. 17. A system of millions or billions of stars being held together by gravitational attraction.
  11. 18. What each star in our galaxy represents.
  12. 22. 3 to 10 times smaller than large galaxies.
  13. 23. The distance that light can travel in one year.
  14. 24. Our galaxy is located on a small partial arm called the ___________________.
  15. 30. Light years is a unit of __________________ out in space.