This is a helmet big enough for a god alright! This nebula--commonly known as "Thor's Helemt" (for the Norse God of Thunder)--spans 30 light-years across, large enough for any omnipotent head; however it isn't made of steel but molecular cloud, blowing away from the Wolf-Rayet star as it enters pre-supernova stages. NGC 2359 sits 15,000 light-years away in the constellation Canis Major. The blue colour comes from the emission of oxygen gas within the cloud, which makes it an even more stylish piece of headgear for any Avenger.
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