Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the sun. The accompanying graphic is an artist's illustration of galaxy with a supermassive black hole at its core.
Young black hole
Artist's illustration of young black hole.
A pair of jets observed being emitted from a stellar black hole.
The black hole Cygnus X-1 has been found to give of X-ray emissions that flicker in hundredths of a second.
Credit: NASA Marshall Center
The Cygnus X-1 system consists of a black hole with a mass about 10 times that of the Sun in a close orbit with a blue supergiant star with a mass of about 20 Suns