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When Italian scientist Galileo Galilei peered at the moon through his homemade telescope, he sketched its surprisingly craggy surface, published his drawings in 1610 and launched a new field of astronomy called selenography.

An expert in selenography, the science of mapping the moon, he published top books on the subject, including "Atlas of the Moon."

As his Wikipedia entry says, it was "considered by some as the culmination of the art of selenography prior to the space age".

It is a tough problem in selenography to account for these streaks.

These, and a few other similar instances, are all that selenography has to offer by way of evidence of actual lunar change.