The mass–radius diagram developed by David Kipping, Dimitar Sasselov and David Spiegel. The blue line is the boundary condition for a 100 percent water-world. The blue dashed line is a planet with 75 percent water and 25 percent silicate rock, while the brown line is 100 percent iron and the brown dashed line is 75 percent iron and 25 percent silicate rock. Image Credit: Kipping et al.
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