The Universe, Galaxies, & Stars Review

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