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.  Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. 
Halley's Comet is arguably the most famous comet. It is a "periodic" comet and returns to Earth's vicinity about every 75 years, making it possible for a human to see it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to return in 2061.