Alien visitation? No. Lunar X is an example of how lighting and topography can combine to produce a pattern that seems familiar to the human eye.
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Alien visitation? No. Lunar X is an example of how lighting and topography can combine to produce a pattern that seems familiar to the human eye.
from EarthSky » Space http://ift.tt/1KJBSX8
via IFTTT
Telescopically 