Gravity Probe B

Gravity Probe B (GP-B), U.S. spacecraft, launched April 20, 2004, into polar orbit, that tested Einstein’s general theory of relativity. Specifically, it proved the existence of both frame-dragging—a very subtle phenomenon in which the rotation of a body (in this case, Earth) slowly drags the space-time continuum with it—and the geodetic effect, in which Earth’s curvature of space-time causes the circumference of an orbit to be smaller than it would be if space-time were flat....