Halley Comet
Halley's comet is a comet visible from earth every 75-76 years. Officially given the name 1P/Halley, the name usually given after the name of Edmund Halley. This comet is the most famous comet among other periodic comets. Although in every century many long comets that come with more light and powerful, Halley is the only short-period comet with a visible to the naked eye, and therefore is a comet visible to the naked eye is definitely back in the human lifespan. Emergence throughout history has a major influence on human history, although its appearance is not recognizable as the same object until the 17th century. Halley's Comet last appeared in the solar system in 1986, and will reappear in mid-2061.