This is the category for comets, small objects orbiting the Sun that outgas producing a tail when near the Sun.

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• 13 November 2014: Philae space probe lands on comet
• 11 January 2011: Moon water possibly originated from comets, data shows
• 12 July 2010: Rosetta spacecraft passes Lutetia asteroid
• 7 October 2009: New ring discovered around Saturn, could explain dark side of its moon
• 15 May 2009: ESA launches Herschel Space Observatory and Planck Satellite
• 23 February 2009: New comet to be visible to naked eye for several days
• 27 October 2007: Unexpected comet 'outburst' could be visible for weeks
• 22 January 2007: Kuiper Belt object to become comet in approx. 2 million years
• 30 May 2006: Keep your eyes peeled for cosmic debris: Andrew Westphal about Stardust@home
• 24 January 2006: Exclusive: David Anderson talks about the Stardust@home project

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File photo of Halley's Comet, 1910.
Image: The Yerkes Observatory.