Halley's Comet, or formally known as 1P/Halley, is a short-period comet that orbits the Sun once every 75-76 years. It is named after the English astronomer Edmond Halley, who observed it in 1682 and predicted its return. Halley's Comet is one of the most famous comets in history, and it has been observed by astronomers since ancient times. The last time it was visible from Earth was in 1986, and it will return again in 2061.