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by ISL 3651 days ago
People have been testing GR really hard for a century, especially in the last fifty years. Nobody's convincingly found a single chink in the armor.

Clifford Will's "The Confrontation between General Relativity and Experiment" is an excellent introduction to the state of the art (this is the stock reference for everyone in the field).

http://relativity.livingreviews.org/Articles/lrr-2014-4/