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This news story describes Comet Siding Spring's close encounter with the planet Mars and its visit to our part of the solar system, including information about encounters between comets and other solar-system planets, the anatomy of a comet, and the origins of long- and short-period comets. Star Witness News is a series of articles, written for students, that are inspired by Hubble Space Telescope press releases. Supplemental education materials include background information, vocabulary, and discussion questions and answers. Common Core Standards for English Language Arts are also identified.