The universe

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Across
  1. 4. Billions of stars.
  2. 7. a very famous German scientist and inventor.
  3. 8. a very big star.
Down
  1. 1. An explosion than happened billions of years ago.
  2. 2. Mercury, Venus,Mars, Jupiter are...
  3. 3. the plantet that we live in .
  4. 5. adjective.The Universe is ...
  5. 6. name of a galaxy that contains 300 billions stars.