Question

If Saturn were compressed to the same density as Jupiter, what would Saturn’s new radius be?

Answer 1

Jupiter has a density of about 1.33 g/cm^3 while Saturn has a density of just 0.687 g/cm^3. This is actually a result of the massiveness of Jupiter. Pressure causes the interior of massive planets such as Jupiter to compress, more so with additional mass. In an extreme example, neutron stars have a density of about 10^14 g/cm^3, containing about 1.4 times the Sun’s mass while having a radius of only 10 km. In short, mass and size have a complicated relationship and cannot be directly correlated.