NASA Experiment Weakens String Theory, but Doesn't Disprove It. ... Experimentation in real life based on string theory is still pretty new, with much to discover. Scientists didn't find the particles they were seeking, which means one of a few different takeaways.

Has string theory been proven?

String theory (or, more technically, M-theory) is often described as the leading candidate for the theory of everything in our universe. But there's no empirical evidence for it, or for any alternative ideas about how gravity might unify with the rest of the fundamental forces.

Is string theory a failure?

String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the most useful sets of tools in science.