How do we know Einstein has it right?

Question

We constantly say that Einstein’s General and Special theories of relativity have passed many different tests, insenuating their accuracy.

Before Einsten, we tested Isaac Newton’s theories, which also passed with accuracy until Einstein came along.

What’s to say another Einstein/Newton comes along 200-300 years from now to dispute Einstein’s theories?

Is that even possible or are his theories grounded in certainty at this point?

In: 593

Answer 1

Of course it could be the case that someone comes along and refines Einstein’s theories, just like Einstein’s theories refined Newton’s.

But, remember, Newton “had it right” for his time, and even now, Newton’s equations still get you close enough for most practical purposes.