Sep 19, 2020
M-theory unifies all five consistent versions of string theory as well as called supergravity in a single mathematical structure.
The five competing string models differed in the details that some theories only had closed loops of strings, while others allowed open, wiggling strings.
Some theories only allowed vibrations to travel in one direction on the strings, while others allowed both.
So M-Theory showed that all five string theories are really just small corners of a much larger, and much more mysterious, theory.
