Hubble finds an unexpected collection of black holes
When scientists using Hubble looked at globular cluster NGC 6397, they expected to find one black hole at its center. Instead, they found something strange.
Uh-oh: Black hole up to 100 billion times the mass of the sun has vanished
Scientists are puzzled by the apparent absence of a supermassive black hole estimated to weigh between 3 billion and 100 billion times the mass of the sun.
Is Planet Nine a miniature black hole? Scientists have a way to find out
It involves flares, comets, and a brand new sky survey