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• 1 2016-04-05T10:08:07+00:00 The Outer Planets 5 image_header 2016-07-12T11:52:18+00:00 The outer, Jovian (named after Jupiter) planets consist of Jupiter, Saturn, Uranus, Neptune.
  
  While these planets are large in diameter, their densities are relatively low, ranging from 687 to 1638 kg/m³ or 0.687 to 1.638 g/cm³. With a density of less than 1 g/cm³, Saturn would theoretically float on water.  These planets cannot be rocky bodies and they are indeed primarily composed of gases and liquids.  Their surface pressures are unknown because their surfaces are deep in their atmosphere and the locations and pressures are not known.
  
  
  
  
  These planets have also managed to acquire a large number of moons, but we will see later that the really interesting moons are the inner, larger ones.  This image shows the major moons of the outer planets, in relation to our moon.  Also added into this size comparison are Mars' moons and Pluto's moon Charon, and of course the Earth itself.
  
  
  
  To see how these larger moons compare to all the moons within the solar system see this image.  We should point out that this image is at least 7 years old and we keep discovering more moons in the outer regions of the solar system.  At present, Jupiter has at least 67 moons alone.
  
  And even though it is no longer a planet, we'll stop at Pluto next.