Final answer:
The diameter of the larger sphere is twice as long as the diameter of the smaller sphere.
Step-by-step explanation:
To compare the diameters of two spheres with one sphere having a radius twice as long as the other, we can use the formula for diameter which is twice the radius. Let's say the radius of the smaller sphere is r. Then, the radius of the larger sphere would be 2r.
And since diameter is twice the radius, the diameter of the smaller sphere is 2r and the diameter of the larger sphere is 4r. Therefore, the diameter of the larger sphere is twice as long as the diameter of the smaller sphere.