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Re:Physicists Detect Gravitational Waves, Proving Einstein R... by acchow on Thursday February 11, 2016 @01:35PM (#11081976)
Logical fallacy, yes. But fairly accepted anyway.

Someone comes up with a theory that's mathematically simple, beautiful, and consistent. That's great, but we don't consider it "correct" until it actually predicts something novel and we verify the prediction holds experimentally.

That's your "Y, therefore X".

Re:Physicists Detect Gravitational Waves, Proving Einstein R... by ddingus on Thursday February 11, 2016 @01:42PM (#11082043)
Iteration and verification is a part of this.

The core idea is plausible, if circular at present. That's OK. Now, we take that and run with it to expand on what we think we understand and hopefully, confirm and even more hopefully, crack open some new physics.

Seems like Einstein nailed it.

But, questions remain. Any of those could yield insights of similar potency and, ahem... gravity.