Thor’s Helmet Emission Nebula
“This helmet-shaped cosmic cloud with wing-like appendages is popularly called Thor’s Helmet. Heroically sized even for a Norse god, Thor’s Helmet spans about 30 light-years across. In fact, the helmet is more like an interstellar bubble, blown as a fast wind – from the bright star near the center of the bubble’s blue-hued region – sweeps through a surrounding molecular cloud.”
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