our universe

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Across
  1. 3. a ______ system is made up of a star and moving objects
  2. 4. a _____ planet hasn't cleared its own orbit
  3. 5. a layer of gas
  4. 8. a planet is known as a planet if it clears its own _____
Down
  1. 1. all of space and everything in it
  2. 2. a collection of billions of stars
  3. 6. a large ball of gas that gives of heat
  4. 7. the number of planets in our solar system