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More model informationKeean’s Ring is an enormous neutral atomic hydrogen structure very close to the Triangulum galaxy. Despite being one of the most well-studied galaxies in the Universe, the Ring was only discovered a few years ago thanks to the extremely sensitive Arecibo Galaxy Environment Survey. How did it form ? Honestly we have no idea !
More information here : https://astrorhysy.blogspot.com/2015/11/keenans-ring.html
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