I spend a lot of time imagining crazy astrophysics scenarios. I use it as a kind of meditation at night time. When I am imagining multidemensional space, time dialation, and travelling a billion times the speed of light, I find that my mind can't also worry about emails or budgets and stuff.
I have a few crazy ideas. I'll start with one close to home.
I don't know what the theoretical limit of the diameter of a solid planet is. But imagine a world like Earth, but much bigger....like Saturn or Jupiter big. It still has land and water and humans and everything else we had prior to discovering the world is round through simple observation.
Would that enormous surface appear so flat and unending that we would never discover the nature of the Universe? If we were stuck in a flat plane that could not be observed to be round, how crippled would physics and calculus be? How else could the geniuses figure it out through observation?
*this is not a flat Earth topic