I kind of had the same intuition as the op, but you are most likely correct. A lot of ridiculously smart people all seem to think it's out there somewhere. Are

I kind of had the same intuition as the op, but you are most likely correct. A lot of ridiculously smart people all seem to think it's out there somewhere. Are there any popular theories that posit that gravity behaves differently at these large scales? Or are all the smart people in the same camp of the being dark matter somewhere?