To the extent that we even understand string theory, it may imply a massive number of possible different universes with different laws of physics in each universe. If we can predict anything, then we haven't explained anything.
“If string theory is a mistake, it's not a trivial mistake. It's a deep mistake and therefore worthy.”
— Lee Smolin
String theory has the potential to show that all the wondrous happenings in the universe – from subatomic quarks to orbiting binary stars; from the big bang fireball to the majestic swirl of heavenly galaxies - are reflections of one master equation.