The Universe, Galaxies, & Stars Review

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Across
  1. 3. The name of our galaxy (2 words)
  2. 4. The brightest stars live ______ that the dimmest starts (longer or shorter)
  3. 6. An increase in the wavelength of light emitted from galaxies as they move away from us (2 words)
  4. 8. The coldest stars live _____ than the hottest stars (longer or shorter)
  5. 9. The process of two hydrogen atoms fusing together to create helium and a lot of energy (2 words)
  6. 14. The color of the hottest stars
  7. 15. The universe is everything and is ______________
  8. 16. A ______ _____ cannot be seen because they emit no light, but they are found in most galaxies (2 words)
  9. 18. Cosmic background ________ is wave energy that is left over after the universe first cooled and is detectable every where in our universe
  10. 19. This force helps hold galaxies together
  11. 20. The type of galaxy that is made of mostly bright young stars
Down
  1. 1. The rapid expansion event that created the universe (2 words)
  2. 2. Our galaxy is this type (2 words)
  3. 5. The type of galaxy that is made of mostly old stars
  4. 7. A scientific ______ is one that is supported by a great amount of evidence and support, but can be disproven by new evidence
  5. 10. All matter & energy was once contained in a very small dense _____.
  6. 11. The scientist who determined that galaxies were moving away & that the farthest ones were moving the fastest
  7. 12. The color of the dimmest stars
  8. 13. A large group of stars and dust that is held together by gravity is called a _______
  9. 17. By working backwards from the known current expansion rate of the universe, scientists have determined that the universe is 13.8 ____ years old