Thor’s Helmet (NGC 2359). The distinctive shape of the nebula NGC 2359 has led to it also being known as Thor’s Helmet, as it resembles the headgear of the Norse God (and Marvel superhero). Around 11,000 light years away, the overall bubble shape is mainly due to interstellar material swept up by the winds of the nebula’s central star, Wolf-Rayet, an extremely hot giant thought to be in a pre-supernova stage. (Photo by Adam Block)
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