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NGC 2359, or Thor's Helmet, is a prominent 30 light-year-wide emission nebula in the constellation Canis Major, situated 12,000–15,000 light-years from Earth. The nebula's distinctive, wing-shaped structure is sculpted by intense stellar winds from a central, rapidly evolving Wolf-Rayet star.
Formation & Appearance: The nebula’s "helmet" shape arises from high-speed winds interacting with surrounding interstellar material. The nebula often displays a blue-green hue due to ionized oxygen.
Dynamic Structure: Unlike the simpler Bubble Nebula, Thor's Helmet displays complex, bow-shocked filaments from its interaction with a nearby molecular cloud.
Future Fate: The central star is in a pre-supernova phase, destined to explode in the astronomical future.