The Solar System

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Across
  1. 2. It used to be a planet, now no more!
  2. 5. The most famous comet
  3. 7. Comets are made of ______ and gas
  4. 9. They became extinct because of a meteor impact
  5. 10. It's at the centre of the Solar System
  6. 11. It takes 225 days to orbit around the Sun
  7. 12. The material the first four planets are made of
Down
  1. 1. It's the fifth planet from the Sun
  2. 3. Number of minutes the light takes to travel from the Sun to the Earth
  3. 4. They orbit around the Sun but they don't have a tail
  4. 6. The mission that orbited Mercury in 2012.
  5. 8. Saturn's moon