This theory was tested in an experiment in which radioactive iron was placed on a loudspeaker, done by Pound and Rebka. It provided the first explanation for the precession of Mercury's perihelion. A standard textbook on this subject was written by Charles Misner, John Archibald Wheeler, and Kip S. Thorne. One equation in this theory relates the curvature and the stress-energy (*) tensor. One consequence of this theory is that GPS satellites continually need to readjust 
This theory was tested in an experiment in which radioactive iron was placed on a loudspeaker, done by Pound and Rebka. It provided the first explanation for the precession of Mercury's perihelion. A standard textbook on this subject was written by Charles Misner, John Archibald Wheeler, and Kip S. Thorne. One equation in this theory relates the curvature and the stress-energy (*) tensor. One consequence of this theory is that GPS satellites continually need to readjust their clocks. This theory explains gravitational lensing. For 10 points, name this theory that uses the curvature of spacetime to explain gravity, often contrasted with a "special" theory also developed by Einstein.
This theory was tested in an experiment in which radioactive iron was placed on a loudspeaker, done by Pound and Rebka.