Article in Saturday's NYT said that impact experiment detected 28
gallons of water. I assume that's a best guess based on spectroscopy
of the plume of dust raised by the impact. Other satellites have found
traces of water over much of the surface, but like a few parts per
million, and that only on the very top layer, which might not be
representative of depths (because the traces of water could be formed
by reactions between oxides in the rock and hydrogen atoms in the
solar wind). -- Mixon
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