Deep in the normally hidden recesses of giant molecular cloud [ http://archive.ncsa.uiuc.edu/Cyberia/Bima/GMC.html ] DR21, a stellar nursery has been found creating some of the most massive stars yet recorded. The orbiting Spitzer Space Telescope [ http://www.spitzer.caltech.edu/about/fastfacts.shtml ]'s Infrared Array Camera [ http://cfa-www.harvard.edu/cfa/oir/Research/irac/firstpage.html ] opened the window into the cloud [ http://antwrp.gsfc.nasa.gov/apod/ap030921.html ] last year in mid- infrared [ http://www.gemini.edu/public/infrared.html ] light. The cloud is opaque to visible light because of dense interstellar dust [ http://antwrp.gsfc.nasa.gov/apod/ap030706.html ]. Noticeable in the above representative color infrared Spitzer image [ http://www.spitzer.caltech.edu/Media/releases/ssc2004-06/ssc2004-06b.shtml ] are huge bubbles [ http://antwrp.gsfc.nasa.gov/apod/ap040328.html ], a complex tapestry of dust and gas, and very massive stars. The infrared filaments actually glow because of organic compounds [ http://en.wikipedia.org/wiki/Organic_compound ] known as PAHs [ http://www.chem.ucl.ac.uk/cosmicdust/pah.htm#what ]. The intricate patterns are caused by complex interactions between interstellar winds [ http://antwrp.gsfc.nasa.gov/apod/ap000318.html ], radiation pressure [ http://scienceworld.wolfram.com/physics/RadiationPressure.html ]s, magnetic field [ http://www-istp.gsfc.nasa.gov/Education/wmfield.html ]s, and gravity [ http://www.snibbe.com/scott/dynamic/gravilux/gravilux.html ]. The pictured region [ http://www.jpl.nasa.gov/releases/2004/100.cfm ] spans about 75 light years [ http://www.howstuffworks.com/question94.htm ] and lies about 6,000 light years distant toward the constellation [ http://www.astro.wisc.edu/~dolan/constellations/extra/constellations.html ] of Cygnus [ http://www.astro.wisc.edu/~dolan/constellations/constellations/Cygnus.html ].