The world outside our world

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Across
  1. 4. over the skys
  2. 5. not a planet anymore
  3. 6. Everything
  4. 8. Anothor word for star
  5. 10. Isaac Newton discovered it
Down
  1. 1. biggest planet in our solar system
  2. 2. Lifing creatures not from earth
  3. 3. A white object in the sky
  4. 7. The explosion of a star
  5. 9. Thegalaxy we are in