Fra MauroArticle Free Pass Fra Mauro, crater on the Moon that
appears to be heavily eroded; it was named for a 15th-century
Italian monk and mapmaker. About 80 km (50 miles) in diameter,
Fra Mauro lies at about 6° S, 17° W, in the Nubium Basin (Mare
Nubium) impact structure. The name is also applied to the
extensive surrounding region, called the Fra Mauro Formation,
which lunar scientists interpret to be material ejected from the
impact that formed the giant Imbrium Basin (Mare Imbrium) to the
north—the largest impact basin (mare) on the Moon’s near side. A
broad, shallow valley within the formation about 50 km (30
miles) north of Fra Mauro crater served as the site of the
Apollo 14 manned lunar landing in February 1971. On two separate
Moon walks, Apollo astronauts Alan Shepard and Edgar Mitchell
collected samples of what was believed to be ejected rock; in
later radiometric analysis on Earth, this material was found to
have been thermally shocked about 3.9 billion years ago,
presumably by the cataclysmic e