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Four billion miles from the sun floats Ultima Thule, an icy celestial body that NASA scientists announced Wednesday is aptly shaped like a giant snowman. The first detailed images beamed back from the US agency's New Horizons mission allowed scientists to confidently determine the body was formed when two spheres, or "lobes," slowly gravitated towards each other until they stuck together -- a major scientific discovery. The New Horizons spacecraft on Tuesday flew past Ultima Thule, which was discovered via telescope in 2014 and is the farthest and potentially oldest cosmic body ever observed by a spacecraft.
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