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The ionizing radiation of the central star is responsible for the nebula's glow

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Different parts of Thor’s Helmet are expanding at different rates, estimated to be from 10 km/s to 30 km/s or more. The different rates of expansion put the estimates of the nebula’s age in the range between 78,500 and 236,000 years

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The overall helmet shape is a result of interaction of the expanding bubble of expelled material with giant molecular clouds in the area

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TH is the result of its central star expelling its outer layers

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The central star is believed to be 20 million years old

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Its central star is 280,000 times brighter than the sun

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Located in the constellation Canis Major

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It is located about 12,000 light years away from us

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TH spans 30 light years across

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Thor's Helmet is classified as an emission nebula