As Dawn slowly approaches Ceres, this dwarf planet's inexplicable white spot is increasingly coming into focus. Thanks to xkcd's Randall Munroe, we may finally have the answer.
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Seriously, though — what the hell is that thing? Here's the latest clip from Dawn, in which you can see the spot at top left of Ceres.
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An hour's worth of Ceres observations. Image credit: NASA/JPL Caltech/UCLA/MPS/DLR/IDA