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Red Rectangle Nebula. There is an aging binary star at the center of the nebula, which will probably eventually become a planetary nebula. Astronomers are still trying to work out what's going on in this complex nebula. (Image Credit: ESA, Hubble, NASA; Reprocessing: Steven Marx, Hubble Legacy Archive) Mona Evans "Monoceros the Unicorn" http://www.bellaonline.com/articles/art182324.asp

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M57: The Ring Nebula Image Credit: NASA, ESA, and the Hubble Heritage (STScI / AURA)- ESA / Hubble Collaboration