Oceanus Procellarum

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Oceanus Procellarum is the large mare in the center and upper left of this image. Visible in the upper right is another large mare, Imbrium, and below is the small round Mare Humorum.
Oceanus Procellarum is the large mare in the center and upper left of this image. Visible in the upper right is another large mare, Imbrium, and below is the small round Mare Humorum.

Oceanus Procellarum (pronounced[help] /oʊˈsiːənəs ˌprɒsəˈlɛərəm/), Latin for "Ocean of Storms", is a vast lunar mare on the western edge of the near side of Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather. Procellarum is the largest of the lunar maria, stretching 2500 kilometers across its north-south axis and covering roughly 4,000,000 km².

Like all lunar maria, Oceanus Procellarum was formed by ancient basaltic flood volcanic eruptions that covered the region in a thick, nearly flat layer of solidified magma. Unlike the other lunar maria, however, Oceanus Procellarum is not contained within a single well-defined impact basin (evidence for a "Procellarum basin" of impact origin is equivocal). Around its edges lie many minor bays and seas, including Mare Nubium and Mare Humorum to the south. To the northeast, Oceanus Procellarum is separated from Mare Imbrium by the Carpathian Mountains.

The robotic lunar probes Luna 9, Luna 13, Surveyor 1 and Surveyor 3 landed in Oceanus Procellarum. The manned Apollo 12 mission also landed in Oceanus Procellarum, with astronauts Pete Conrad and Alan Bean onboard.

Sinus Roris lies on the northern edge of Procellarum.

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