a large round pit caused by the impact of a meteoroid on the moon's surface
large, dark, flat areas on the moon
mountains on the moon
the movement of an object around another object
a single complete turn (axial or orbital)
(astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun)
the continuous waxing and waning phases of the moon
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