Big Bang and the Universe Crossword

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Across
  1. 3. the thing everything is made of
  2. 4. the person who came up with the theory of relativity
  3. 6. the astronomer who discovered uranus
  4. 7. the force that keeps earth in orbit
  5. 8. the thing the universe is constantly doing
Down
  1. 1. the type of galaxy that the milky way is
  2. 2. the first atom created
  3. 3. the galaxy that you live in
  4. 5. the expansion of the universe