>It leads to lots of really interesting and fun sci-fi that somehow hasn't really been dug into sufficiently yet along the same lines as the Twin Paradox It's

>It leads to lots of really interesting and fun sci-fi that somehow hasn't really been dug into sufficiently yet along the same lines as the Twin Paradox It's been done. I mean, time dilation in general, and a fast ship catching up with a slow ship in particular. I would guess 50 years ago-ish practically every variation had been done. Tau Zero was a notable example. I don't know when the genre started, but it's easy to forget or not be aware than Einstein came out with special relativity almost the exact same time as the Wright brothers were getting their plane going. Technology has taken a long time to catch up to physics.