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The Moon’s Dark Seas Are Scars From Ancient Strikes—Even Bigger Than We Thought

Mare Imbrium, one of the large dark basalt "seas" on the Moon's near side. (Photo: J. Major)

Mare Imbrium—the “Sea of Rains”—one of the large dark basalt lava flows on the Moon’s near side. (Photo: J. Major)

When you look up at a full or full-ish Moon you can’t help but notice the large dark spots that mark its Earth-facing side. These form the face of what many call the “Man in the Moon” (or the body of a Moon rabbit, to others) and are individually called mare (“MAR-ay”) which is the Latin word for sea. Early astronomers thought they were bodies of water, but in reality they are solidified dark lava flows from ancient lunar impact events that occurred several billion years ago.

One of the biggest lunar seas, Mare Imbrium (see above), had for a while been thought to have been created by the impact of an asteroid or meteorite somewhere around 50 miles across, based solely on computer models.

Now, research conducted by Brown University professor Dr. Peter Schultz—a specialist in lunar and planetary impacts—indicates that the object that formed Mare Imbrium was likely more massive and of much larger size than once thought…perhaps even as big as 190 miles wide.

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