LUIS ARGERICH / SCIENCE PHOTO LIBRARY LUIS ARGERICH / SCIENCE PHOTO LIBRARY
Comet Lovejoy. Comets are icy bodies from the outer solar system that boil and form a bright tail of gas and dust as they approach the Sun. Comet Lovejoy reached its closest approach to the Sun on 16 December 2011. Photographed from Mercedes, Buenos Aires Province, Argentina, on 23 December 2011.
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