A black hole is an object with such powerful gravity that nothing can escape from it, including light. Astronomers have discovered quite a few objects that can only be explained as black holes The closest black holes yet discovered are several thousand light-years away. Stars like the Sun just aren't massive enough to become black holes. The largest known black hole appears to be about three billion times the mass of the Sun
An international network of radio telescopes has produced the first-ever close-up image of a black hole's shadow, which scientists revealed this morning April The collaboration, called the Event Horizon Telescope, confirmed decades of predictions of how light would behave around these dark objects, and set the stage for a new era of black hole astronomy. The announcement, teased for about a week and a half in advance, managed to be both incredibly exciting and almost completely devoid of surprising details or new physics. Physics didn't break down.