> So the most habitable planet would have roughly twice the mass of Earth and be between 20 to 30 percent larger by volume. So, ~60% denser than Earth? Densit

> So the most habitable planet would have roughly twice the mass of Earth and be between 20 to 30 percent larger by volume. So, ~60% denser than Earth? Density is mass/volume, and 2x / 1.25x = 1.6x. The math works out really well if they meant a 20-30% larger radius: 1.25*3 = 1.95, so similar density but larger volume.