Dark Matter

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Across
  1. 3. reveal an identity of something
  2. 6. make an assumption
  3. 7. light
  4. 8. place with all of our solar systems and galaxies
Down
  1. 1. person who studies science
  2. 2. that is unsolved or unknown
  3. 4. being seen
  4. 5. our universe is made up of