This image was taken from my observatory in Tucson in March 2013. It is a stack of 20 15-minute subs, ccombined in CCDStack and processed in Photoshop CS5.
Thor's Helmet is in Canis Major about 1,800 light years away. It is similar in structure to the Bubble nebula and is formed by a solar wind from its central star. Its diameter is about 30 light years.
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