What Is a Black Hole? An artist's drawing a black hole named Cygnus X-1.
It formed when a large star caved in. This black hole pulls matter from blue star beside it. A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. Exoplanets & Extrasolar Planets, Solar System & Universe Space Exploration. Black hole. The solar eclipse.