A comet is an icy small Solar System body that, when close enough to the Sun, displays a visible coma, and sometimes also a tail. These phenomena are both due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comets nuclei are themselves loose collections of ice, dust, and small rocky particles, ranging from a few hundred meters to tens of kilometers across.
Comets have a wide range of orbital periods, ranging from a few years to hundreds of thousands of years.
Some Famous Comets
Halley’s comet
The comet was named for the English Astronomer Edmond Halley. It reappears after every 78 years. It was last seen in 1986.
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