Calculating a Neutron Star's Density

A typical neutron star has a mass between 1.4 and 5 times that of the Sun. It cannot be more massive than this or gravity will overwhelm it and it will become a black hole! The radius of a neutron star may be between 10 and 20 kilometers.

Suppose we have a neutron star that has a radius of 15 kilometers and a mass of 1.4 times that of the Sun. (The Sun's mass is 2.0 x 1030 kilograms.) What is the neutron star's density?

Remember, density (D) = mass ÷ volume and the volume (V) of a sphere is (4/3) r3.