A black hole is a cosmic body of extremely intense gravity from which even light cannot escape. Black holes usually cannot be observed directly, bu...

The singularity constitutes the center of a black hole, hidden by the object’s “surface,” the event horizon. Inside the event horizon, the escape v...

A black hole can be formed by the death of a massive star. At the end of a massive star's life, the core becomes unstable and collapses in upon its...

One example of a black hole is can be found in Cygnus X-1, a binary X-ray system consisting of a blue supergiant and an invisible companion 14.8 ti...