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About the Poster
This giant spiral disk of stars, dust and gas is 170,000 light-years across, almost twice the diameter of our Milky Way galaxy. M101 is estimated to contain at least one trillion stars.
Image courtesy of NASA, ESA, K. Kuntz (JHU), F. Bresolin (University of Hawaii), J. Trauger (Jet Propulsion Lab), J. Mould (NOAO), Y.-H. Chu (University of Illinois, Urbana), and STScI.