THE UNIVERSE

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Across
  1. 2. The only planet whose English name does not derive from Greek or Roman mythology.
  2. 3. This planet probably got this name due to its red colour and is sometimes referred to as the Red Planet
  3. 6. The second largest planet with many rings
  4. 7. The closest planet to the Sun and the eighth longest
Down
  1. 1. This planet is more than twice as massive as all the other planets combined
  2. 3. The only natural satellite of Earth
  3. 4. The largest object in the Solar System
  4. 5. A medium-sized object orbiting the Sun