the universe

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Across
  1. 2. = a person who studies the physical world
  2. 5. = not easy to believe because it is very improbable
  3. 7. = a planet (we live on it)
Down
  1. 1. = creat something that didn't exist before
  2. 3. = a burning ball of gas
  3. 4. = another word for circle
  4. 6. = say or show something is true or definite