Did you know it? Amazing facts about planets

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Across
  1. 3. It used to be treated as a planet
  2. 4. This planet needs 84 Earth years to make one circuit around the Sun
  3. 6. This planet has the shortest day of all the planets
  4. 8. It's the smallest planet that does not have any moons or rings
Down
  1. 1. This planet has the most extensive rings in the solar system
  2. 2. One day on this planet is 22 days on the Earth
  3. 5. It is the most distant planet from the Sun
  4. 7. This planet was once believed to be center of the universe
  5. 8. This second-smallest planet in the solar system has two moons