Strange x-ray pulses hint at a surprisingly long-lived white dwarf orbiting precariously close to a supermassive black hole

Active galactic nuclei are supermassive black holes at the center of certain galaxies. As matter falls into these black holes, enormous amounts of energy are released, making active galactic nuclei, or AGN,

Astronomers have identified a rare cosmic phenomenon: a supermassive black hole, known as J0410−0139, located 12.9 billion light-years from Earth. This black hole, with a mass equivalent to 700 million suns,