Lunar magma ocean

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What Wikipedia says

The Lunar Magma Ocean (LMO) is the layer of molten rock that is theorized to have been present on the surface of the Moon. The LMO was likely present on the Moon from the time of the Moon's formation (about 4.5 or 4.4 billion years ago) to tens or hundreds of millions of years after that time.

Excerpt from the Wikipedia article “Lunar magma ocean”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Daniel Arnold, CC BY-SA 3.0, via Wikimedia Commons.