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Curiosity rover
The Curiosity rover used the Mars Hand Lens Imager (MAHLI) to capture the set of thumbnail images stitched together to create this full-color self-portrait in this October 31, 2012 image. (REUTERS/NASA//JPL-Caltech/Malin Space Science Systems)

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Year in Review 2012: Astronomical Wonders

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Once-in-a-lifetime astronomical events and monumental scientific achievements drove people to look to the skies and online on Yahoo! throughout 2012.