Chandra Embraces Hot ‘Arms’ of Pinwheel Galaxy

With a diameter of about 170,000 light years, galaxy Messier 101 (M101) is nearly twice the size of our Milky Way. Its orientation allows telescopes to see its spiral structure face-on, inspiring its nickname - the Pinwheel Galaxy. NASA's Chandra X-ray Observatory has obtained one of the longest exposures ever seen of a spiral galaxy in x-rays. The

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