On KSP2 and Special Relativity in KSP 2 Discussion Posted August 23 33 minutes ago, rmaine said: Of course then you are basically establishing KSC as an absolute reference frame, which is pretty much exactly the opposite of the whole idea of relativity. And once you try to go down that line, everything falls apart. That's what lead Einstein into time being relative - it was needed to make it all hold together. Hmm, speaking of things falling apart when you try to enforce an absolute reference frame, I just now thought to ask what people would mean by an upper speed limit in KSP. Relative to KSP as an absolute frame? That's not how most speeds in KSP are given and it could result in odd artifacts when near light speed; granted the real world has odd artifacts near light speed, but different ones. I'd argue that it'd only seem like an absolute reference frame from the perspective of the the KSC, which is where you'd be spending the bulk of your time. I wonder if it'd make sense to switch reference frames between the active ship and the KSC, but no other objects in the game.