This is The Whirlpool—the common name of M51, a spiral galaxy similar to our own Milky Way estimated to be 50,000 to 100,000 light years across. The purple dots that make it look like the biggest neon sign in the Universe are X-ray sources as seen by NASA's Chandra X-ray Observatory.
via Gizmodo http://ift.tt/1s4myjI
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