The ghost of a long-dead star, the W63 supernova remnant shines like a faint cosmic smoke-ring along the plane of the Milky Way galaxy toward the northern constellation Cygnus the swan. Its wraithlike appearance is traced against the region's rich complex of interstellar clouds and dust by an eerie blue glow. It shows characteristic light from ionized atoms of sulfur, hydrogen and oxygen in red, green, and blue hues.
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From @lestrange