Scientists Discover Vortex Around Black Hole Spinning At 70 Percent The Speed Of Light
According to a study published in the Astrophysical Journal, the event horizon of one of these stellar objects is spinning close to or at the speed of light—around 670 million miles per hour. (The event horizon is the point of no return around a black hole past which not even light can escape.) The four other black holes that the team of astronomers studied appear to be spinning at about half that rate....