The Crescent Nebula is a rapidly expanding shell of gas surrounding a dying star. In this recently released image [ http://oposite.stsci.edu/pubinfo/PR/2000/23/pr-photos.html ] by the Hubble Space Telescope [ http://oposite.stsci.edu/pubinfo/HSToverview.html ], a bright dynamic part of the nebula three light-years across is shown in representative color. The Crescent Nebula [ http://www.ne.jp/asahi/stellar/scenes/object_e/ngc6888.htm ] began to form about 250,000 years ago as central Wolf-Rayet [ http://antwrp.gsfc.nasa.gov/apod/ap970928.html ] star WR 136 began to shed its outer envelope in a strong stellar wind [ http://www-istp.gsfc.nasa.gov/Education/wsolwind.html ], expelling the equivalent of our Sun's mass every 10,000 years. This wind [ http://science.msfc.nasa.gov/ssl/pad/solar/sun_wind.htm ] has been impacting surrounding interstellar gas [ http://antwrp.gsfc.nasa.gov/apod/ap000412.html ], compacting it into a series of complex shells, and lighting it up. The Crescent Nebula [ http://www.astro.uni-bonn.de/~maltmann/n6888colinfo.html ], also known as NGC 6888, lies about 4,700 light-years [ http://www.howstuffworks.com/question94.htm ] away in the constellation [ http://www.eaglequest.net/~bondono/iconst.html ] of Cygnus [ http://www.seds.org/Maps/Stars_en/Fig/cygnus.html ] and can only be seen through a telescope. Star WR 136 [ http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1996A%26A...316..133G ] will probably undergo a supernova [ http://antwrp.gsfc.nasa.gov/apod/supernova_remnants.html ] explosion sometime in the next million years.