Why? Why and why?
Why should Einstein's relativity be so stunningly true?
Just take a look at these two shots.
You can calculate the predicted gravitational lensing via GR.
What is so special about "Equivalence Principle"?
or the obscure principle of "General Covariance"?
Compared to the other forces, Gravity is drastically distinct. After 100 years of rich theoretical physics it still defies understanding. We should not be too surprised of seeing that the naive field approach to the metric breaks down!.
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