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Space shuttles

After more than 130 missions, the four remaining space shuttles of NASA's fleet found their way to their final resting places after being flown, placed on transport vehicles, and then hauled through streets to museums and science centers. (Patrick T. Fallon/AP Photo)

Year in Review 2012: Astronomical Wonders

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