Spiral Galaxy Messier 51 Friday, September 8, 2017 Add Comment Edit M51 is a spiral galaxy, about 30 million light years away, that is in the process of merging with a smaller galaxy seen to its upper left.Image Credit: X-ray: NASA/CXC/SAO; Optical: Detlef Hartmann; Infrared: NASA/JPL-Caltech Share this post
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