Note for reading the diagram: the vertical axis is planet size. Only the horizontal axis at one particular vertical level is relevant for the main point here.

Note for reading the diagram: the vertical axis is planet size. Only the horizontal axis at one particular vertical level is relevant for the main point here. 1 R🜨 = Earth 4 R🜨 = Uranus/Neptune. 9 R🜨 = Saturn 11 R🜨 = Jupiter ?7–13 R🜨 = estimated range of viable brown dwarfs by one source (*) ?10-64 R🜨 = estimated range of red dwarfs 109 R🜨 = Sun (*) other sources conflict but some have obvious errors. Wikipedia even has different values depending on the unit