Halley's Comet - Wikipedia, the free encyclopedia
Halley's Comet or Comet Halley (/ˈhæli/ or /ˈheɪli/), officially designated 1P/Halley,[2] is a short-period comet visible from Earth every 75–76 years.[2][10] Halley is the only known short-period comet that is clearly visible to the naked eye from Earth,...