When early modern astronomers looked at the moon, in the mid-17th century, they interpreted its large dark areas as bodies of water — an erroneous view that lives on today in the Latin nomenclature of the lunar surface, which features many maria (seas) and even one oceanus.
By the late 19th century however, scientific opinion had changed completely, seeing the moon as being devoid of water as well as atmosphere. This perception of an entirely desiccated moon persisted through the 20th century, reinforced by analysis of samples brought home by Apollo astronauts, which did not contain a hint of water.
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