▲ 36 r/AskPhysics
Can you explain how *instantaneous* communication between two non-relativistic parties would cause paradoxes?
Explanations for why FTL travel/communication violate causality or introduce paradoxes generally rely on at least one party going relativistic speeds. Imagine instead that there are two planets in star systems 10 light years apart, communicating instantaneously using a sci-fi standard, the ansible. It seems like this should cause problems, because the messages are traveling faster than the speed of light. How does it cause these problems? If FTL in this situation is not problematic, why not?
u/motes-of-light — 1 day ago