The scientific explanation for the universe

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Across
  1. 6. something that takes up space
  2. 7. a minute portion
  3. 9. A duration of_
  4. 10. a representation of a black hole.
  5. 12. the scientific theory of the beginnning of the universe
  6. 13. Proof of something
  7. 15. An idea
Down
  1. 1. In which thing happens
  2. 2. something that is or has been created
  3. 3. A theory that there are A collection of lots of univrses including our own
  4. 4. A person gave the theory of_. It says we came from apes
  5. 5. the process of expanding
  6. 8. One of our three major subjects beginning with S
  7. 11. the unlimited three-dimensional realm
  8. 14. The surname of the person who gave the theory of Evolution