Discusses discovery, composition, nucleus, 1986 passage, probes from Earth, tail, solar wind and general comet data.
A comet is a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the sun (Encyclopedia.com). Comets are rarely visible from the earth, but when they can be seen, their visibility can last anywhere from a few days to a few months (Columbia Encyclopedia). Most comets are invisible to us on earth except when they are near the sun and comets are usually only visible at sunrise or sunset. There have been many comets discovered by astronomers throughout time, but the most well known is Halley’s Comet, also known as Comet Halley.