Sign up for CNN's Wonder Theory science newsletter.Explore the universe with news on fascinating discoveries, scientific advancements and more.Recent telescope data revealed that a small planet in the far reaches of our solar system has a dense ring round it.And scientists are baffled as to why.The planet, Quaoar, is one of roughly 3,000 small planets that orbit the sun beyond Neptune, and at 690 miles (1,110-kilometers) wide, it's about the seventh largest, with Pluto and Eris ranking as the biggest.
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