A KIII civilization could generate a perfect simulation of a volume with a radius of about 100 AU. This is a large distance, and when I wrote the first edition of this book our civilization was unable to test whether our universe is “real” or the result of a simulation developed by a KIII civilization. But the situation has changed. Voyager 1 is already 127 AU from home and it didn’t bump into a metal wall painted black! We know that we don’t live in a perfect simulation.
