Saturn
The ringed giant, the least dense planet: its average density is lower than water's.
NASA, ESA, A. Simon (Goddard Space Flight Center), and M.H. Wong (University of California, Berkeley) (CC BY 4.0)
A giant light enough to float in water, if you could find a bathtub big enough, wearing the most spectacular rings in the solar system.
Saturn is a gas giant made mostly of hydrogen and helium. Its bright rings are made of countless pieces of water ice and rock, from dust grains to boulders; they are hundreds of thousands of kilometres wide but mostly only tens of metres thick.
Its average density, about 0.69 g/cm³, is lower than that of water. Its largest moon, Titan, has a thick atmosphere, and the small moon Enceladus sprays water ice from an underground ocean.
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