By Andrew Grant
GENEVA — An effect of general relativity that is barely measurable on Earth has been spotted in full force around a black hole.
Physicists detected the signature of a black hole twisting the fabric of spacetime around it. The discovery offers the best evidence yet of this relativity-driven twisting effect, known as frame dragging, around a black hole where it is most powerful. The research was reported December 16 at the Texas Symposium on Relativistic Astrophysics.