This is such a beautiful image that I had to post it to my blog even though it's not remotely related to books. It appeared on the New York Times with the following explanation:
Moon water. The green spherules, made of glass, are pieces of the Moon, typically about one-fifth of a millimeter in diameter, that were erupted from the lunar mantle long ago. New analysis of these volcanic glasses, which were collected by Apollo 15 astronauts, indicate that they contained 745 parts per million of water before the eruption. That suggests that there could be water in the interior of the Moon, which would be unexpected. The Moon is believed to be the result of a collision between the Earth and a Mars-size asteroid, and that cataclysm would have left the Moon high and dry.
Photo credit: NASA.
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