4 ms·
Comparing rocky planets, density doesn't really matter at all. The range of possible densities for rocky planets is tightly constrained. What matters is the fac
by OkayPhysicist 3y ago
Comparing rocky planets, density doesn't really matter at all. The range of possible densities for rocky planets is tightly constrained. What matters is the fact that surface gravity scales sub-linearly with regards to a planets mass.
M = 4/3*pi*r^3*d
r = (4/3*pi*d/M)^(-1/3)
a = GM/r^2
a = GM(4/3*pi*d/M)^(2/3)
a = G(4/3*pi*d)^(2/3) * M^(1/3)
- wheels 3y agoWe know that it's not (primarily) rocky though because the radius is 2.6 that of earth, but the mass is only 8 times. So it's about about 46% as dense as earth.