Assertion: relativity's theory | /r/HasProperty | based upon the existence of an aether
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text: In particular, Zhang showed that these experimental limits essentially require that any theory based upon the existence of an aether be experimentally indistinguishable from SR, and have an aether frame which is unobservable (the only alternative is for a theory to “live in the error bars” of the experiments, which is quite difficult given the high accuracies achieved by many of these experiments).