A sphere passes through the origin and is centered at (3,4,-5).
A different sphere has equation (x + 2)2 + (y + 6)2 + (z + 10)2 = 4.
Find the shortest distance between the surfaces of the two spheres, in exact form and then approximate form.
(That is, if they were two planets, what is the shortest distance one would have to travel through space to get from
the surface of one to the surface of the other?)