Halley’s Comet appears only once every 75 years, sparking excitement among both casual observers and astronomers. Learn what makes this celestial event so special. Halley’s Comet appears only once every 75 years, sparking excitement among both casual observers and astronomers. Learn what makes this celestial event so special. The Sciences All Articles | Discover Magazine
When Was Halley’s Comet Last Seen and Will It Ever Return?
