The Planets

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Across
  1. 4. the smallest terrestrial planet; the smallest plant in the Solar System
  2. 5. the farthest planet from the sun; the smallest of the gas giants
  3. 7. the most widely searched planet for life
  4. 8. the biggest planet of our solar system; one of the five visible planets
Down
  1. 1. the second-largest planet in the Solar System; has a total of 82 confirmed moons
  2. 2. the biggest of the ice giants; the only planet known to rotate on its side
  3. 3. the second planet from the sun; the 6th largest planet in the Solar System
  4. 6. is around 4.5 billion years old