My colleague Tim Barber just made a surprising observation that may help explain why we don’t have visitors from other worlds. The bottleneck may not be propulsion, but perception. At interstellar speeds, even tiny pebbles can destroy a ship, and detecting them in time requires an “eye” that grows astonishingly large.
Interstellar travel is a vision problem
The pebbles will kill you way before you get to relativistic speeds
