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Depends what you mean by "robust."

If you mean, "Are there any experimental observations that support or rule out string theory or any of its alternatives?", the answer is, "No -- an we can't even conceive of any way of doing so." It's not just a matter of building an accelerator ten times larger than CERN, or even a a million times larger than CERN -- an accelerator to test String Theory would have to be 10^14 times larger.

If you mean, "Is the mathematics of M-theory (a subset of the string theory paradigm) internally self-consistent?", the answer is "Yes."

If you mean, "Does M-theory unite gravity with quantum mechanics, a task no other hypothesis has been able to do?", the answer is "Yes."

If you mean, "Does M-theory predict a universe that is exactly like ours?", the answer is "Yes, but it also predicts 10^500 OTHER universes." In other words, if you assume that the math of M-theory correctly describes where we happen to exist, then you can end up not only with our Universe but just about any universe you could imagine -- and a few you COULDN'T imagine.

It may turn out that either (1) a future mathematician will be able to show that the math of M-theory predicts ONLY our Universe, or (2) maybe there really ARE 10^500 universe in our cosmos, and we just happen to be living in one of the few where intelligent life could exist.

Or we may find a way to experimentally test string theory and find it either verified or refuted.

At this point, we just don't know.

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Q: How robust is the hypothesis or theory called String Theory?
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