373 -- The Smoking Vents of Triton. The Voyager spacecraft, as it passed Neptune's satellite, Triton, surprised scientists by photographing smoking vents, where columns of smoke rose many kilometers and then was sheared off by high altitude winds in the very thin atmosphere (much thinner than Mars' atmosphere). The nature of the vents is unknown, although they may be something like geysers; they imply heat sources in the interior of the icy moon. (Joint painting by William K. Hartmann and Ron Miller, for our book, The Grand Tour).
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