Gravity Probe B

Einstein's theory of General Relativity predicts that spacetime can be warped by gravitational fields. Since Einstein published the theory, an expansion of his theory of Special Relativity, in 1916, it has become generally accepted by scientists, but never proven, since it was technologically impossible in the past to design an experiment to detect the warping of spacetime by a gravitational force -- that was the past -- this is now, and now there is Gravity Probe-B. GP-B was launched into orbit to run an experiment to detect the warping of spacetime by Earth's gravitational field.