Topic
general relativity
NASA NuSTAR telescope measures supermassive black hole spin rate for first time
Astronomers used combined data from NuSTAR and XMM-Newton to definitively measure the spin rate of a supermassive black hole in galaxy NGC 1365.
A ‘direct wave’ from colliding black holes reveals signature of a whirlpool in spacetime
Researchers have identified a previously hidden component of a gravitational wave signal that provides a direct probe of a black hole's event horizon.