HackerTube / Video
Superluminal Time Travel + Time Warp Challenge Answer
PBS Space Time
A PBS Space Time episode explaining why faster-than-light travel is equivalent to travelling back in time, using relativity and Minkowski diagrams for different observers.
HN points to it in warp drive discussions as a math-free explanation of why superluminal travel causes causality problems.
3 Hacker News mentions · 2018–2022