human
Is there evidence that the earth is round?
assistant
Yes, there is evidence that the earth is round. The most common form of this evidence comes in the form of photographs taken from space. These photos show a curved horizon, which would not be possible if the earth were flat. Additionally, gravity and the force of attraction between two bodies depend on distance, so if the earth were flat, then it would make no sense for objects to fall towards the center of the earth.