Space

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Across
  1. 3. the smallest planet in the solar system
  2. 5. the hottest planet in the solar system
  3. 8. a small rocky body which orbits the sun
  4. 9. the eighth planet from the sun
Down
  1. 1. the outer atmosphere of a star
  2. 2. leftovers from the creation of our solar system, consisting of sand, ice and carbon dioxide
  3. 4. a collection of many stars held together by gravity
  4. 5. an empty space with no matter
  5. 6. also known as the Dog Star
  6. 7. Earth’s only permanent natural satellite