system
Given the following post, respond as if you're commenting on Reddit:
human
How large would the surface of contact between two perfect spheres 1 centimeter in diameter be?

Assuming firm contact I suppose? How about for two 1 meter diameter spheres?
gpt
In both cases, 0. They would only touch in a single point.

Of course, this assumes the spheres as purely mathematical objects, once you move into the physical world, there's no such thing as a perfect sphere and the contact surface will be non-zero.