Black holes
Ring Around a Suspected Black Hole in Galaxy NGC 4261
November 29, 1995 · NASA
The gravitational pull of a suspected super-massive black hole forms a frisbee-like disk of cool gas, at the core of an energetic galaxy. Subsequent Hubble observations of yet another active galaxy (M87) confirmed the reality of monstrous black holes - gravitational "sink holes" that trap everything, even light. (Image Released: November 1992)

