Halley's Comet, or Comet 1P/Halley, is a short-period comet that orbits the Sun every 75-76 years. It was first observed by Edmund Halley in 1705 and is named after him. The comet is visible from Earth every 75-76 years, with its next appearance expected in 2061. Halley's Comet is one of the most famous comets in the Solar System and has been observed by humans for centuries. It consists of a nucleus of ice and dust, surrounded by a coma of gas and dust particles. As it approaches the Sun, its nucleus heats up and releases gas and dust particles into its coma, forming a tail that can be seen from Earth.