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In 2007, Dutch secondary school biology teacher Hanny van Arkel spotted something mysterious in the night sky. Combing through Galaxy Zoo, an online database set up to enlist the public's help in classifying galaxies, she came across a glowing green smudge of light approximately 650 million light-years away. The object, which became known as Hanny's Voorwerp (Dutch for "object"), is one of the most mysterious in the universe. Now, detailed Hubble Space Telescope images and new x-ray observations presented here today at the 217th meeting of the American Astronomical Society may finally confirm what it is.

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Category: Science