Sheet music for my country tis of thee
A rotating black hole is a solution of Einstein's field equation. There are two known exact solutions, the Kerr metric and the Kerr–Newman metric, which are believed to be representative of all rotating black hole solutions, in the exterior region. This Black Hole Apocalypse | Gravity and Spacetime Video is suitable for 9th - 12th Grade. Astronauts on the ISS continuously fall in a curve thanks to gravity. A video describes the idea of falling along a curved path.