Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and the only naked-eye comet that might appear twice in a human lifetime.

Predicted next perihelion: July 28, 2061

Orbital period: 75 years

Radius: 3 mi

Orbits: Sun

Discoverers: Edmond Halley, Nicole-Reine Lepaute

Did you know: In 1986, Halley's Comet was the first to be observed in detail by spacecraft.