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Comets are icy objects that release gas and dust as they orbit the Sun. The solid part of a comet is called the nucleus and is mainly made of frozen water, dust and sometimes other frozen substances such as ammonia. Solar radiation heats the nucleus and gives it an atmosphere of gas and dust called the coma. A comet's distinctive tail is caused by solar radiation and a stream of charged particles that constantly jets away from the Sun called the solar wind. It is thought that comets are material leftover from the formation of the outer planets, although another theory is that many formed outside our solar system.

Comet C/2013 R1 Lovejoy Comet C/2009 P1 Garradd Comet C/2009 P1 Garradd Comet p103 Hartley 2 Comet p103 Hartley 2 Comet p103 Hartley 2 Comet C/2007 N3 Lulin Comet C/2007 N3 Lulin

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