DCA 5 Review

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Across
  1. 2. 95 percent of the mass and energy contents in the universe are made of dark matter and this.
  2. 4. cosmic ______ background radiation; evidence that the big bang occurred
  3. 5. Hubble used this to measure galaxies, shows galaxies are moving away from us
  4. 9. the neighboring galaxy that is slightly larger in mass than us
  5. 11. Sagittarius A, the black hole at the center of our galaxy, releases these kind of waves
  6. 12. the invisible particles traveling freely through the universe and are extremely hard to detect
  7. 13. the invisible and mysterious component that makes up about 25% of all the mass in our universe
  8. 17. the type of galaxy we live in
Down
  1. 1. the name of our galaxy's arm that our sun is located in
  2. 3. once you cross this part of a black hole, nothing can escape; not even light
  3. 6. the most common type of galaxy in the universe
  4. 7. some spiral galaxies have this running across its center
  5. 8. the first element created after the big bang
  6. 10. our solar system is located about 3/5 of the way from the ___ of the milky way galaxy
  7. 14. 13.8 billion years = ___ of the universe
  8. 15. the name of our galaxy
  9. 16. the type of galaxy that contains mostly older stars