NASA’s NuSTAR Helps Solve Riddle of Black Hole Spin

Two X-ray space observatories have measured definitively, for the first time, the spin rate of a black hole with a mass 2 million times that of our sun.


Black Holes: Monsters in Space

Two X-ray space observatories have measured definitively, for the first time, the spin rate of a black hole with a mass 2 million times that of our sun.