Black Hole, White Dwarf

Strange x-ray pulses hint at a surprisingly long-lived white dwarf orbiting precariously close to a supermassive black hole ...
A strange black hole is making scientists scratch their heads.
The first black hole that astronomers observed "turning off" just turned back on, releasing jets of hot gas into the cosmos.
An artist's concept shows a stream of matter trails a white dwarf (sphere at lower right) orbiting within the innermost accretion disk surrounding a supermassive black hole. — Reuters ...
NASA's Chandra and NuSTAR telescopes have teamed up to study a supermassive black hole-powered quasar that could have played ...