The Solar System

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Across
  1. 2. Pluto, for example
  2. 5. the Milky Way is ours
  3. 7. like Saturn, this planet is made up mostly of gas
  4. 8. Edward Halley has one named after him
  5. 10. Earth's natural satellite
  6. 11. on Earth, 365 revolutions around the sun
  7. 12. the third planet from the sun
Down
  1. 1. a star and all the objects that orbit it
  2. 3. one rotation around Earth's axis
  3. 4. planet known for its rings
  4. 6. the planet closest to the sun
  5. 9. this makes up most of Uranus and Neptune
  6. 10. NASA is exploring this planet now