Pre-Nectarian

sea on the Moon

hypothesized event, occurring ca. 4.1–3.8 billion years ago, during which a large number of asteroids collided with the Moon, Mercury, Venus, Earth, and Mars

very large impact crater on the southern far side of the Moon

lunar mare

lunar mare

lunar mare

lunar mare

lunar mare

rock retrieved from the Moon in 1971

how the Earth's moon was formed

The pre-Nectarian period of the lunar geologic timescale runs from 4.533 billion years ago (the time of the initial formation of the Moon) to 3.920 billion years ago, when the Nectaris Basin was formed by a large impact. It is followed by the Nectarian period.

lunar impact crater

lunar impact crater

impact crater on the Moon

feature on the moon

moon crater

lunar crater

lunar impact crater

according to the giant impact hypothesis, the molten magma that once covered large parts of the Moon as a result of the large amount of energy liberated during the formation of the Moon

lunar crater

lunar impact crater

lunar impact crater

lunar impact basin

feature on the moon

feature on the moon

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