Out of this World

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Across
  1. 2. A group of stars and planets
  2. 5. The study the stars and planets
  3. 7. It is at the center of the solar system
  4. 8. A machine which does the work of a human
  5. 9. A very hot planet
Down
  1. 1. An instrument used to look at objects in space
  2. 3. A big piece of rock which flies through space
  3. 4. What a computer does
  4. 6. It orbits the earth