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Ring nebula M57
The easily visible central ring of Ring Nebula (M57) is about one light-year across, but this remarkably deep exposure—a collaborative effort combining data from three different large telescopes—explores the looping filaments of glowing gas extending much farther from the nebula's central star. This composite image includes a narrowband hydrogen image (8.2-meter Subaru Telescope), a visible-light image (Hubble Space Telescope), and an infrared-light image (Large Binocular Telescope). The three images were combined by Robert Gendler.  In this well-studied example of a planetary nebula, the glowing gaseous shroud represents outer layers expelled from a dying, sun-like star. The Ring Nebula is about 2,000 light-years away toward the musical constellation Lyra.

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