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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.
|Diameter||2,592 km (1,611 mi)|
|Eponym||Ocean of Storms|
Oceanus Procellarum (/ /; Latin for "Ocean of Storms") is a vast lunar mare on the western edge of the near side of Earth's Moon. It is the only one of the lunar maria to be called an "Oceanus" (ocean), due to its size: Oceanus Procellarum is the largest of the maria, stretching more than 2,500 km (1,600 mi) across its north-south axis and covering roughly 4,000,000 km2 (1,500,000 sq mi).
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 may or may not be contained within a single well-defined impact basin. 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. On its north-west edge lies the 32 km wide Aristarchus ray crater, which is considered as the brightest feature on the Near side of the Moon. Also, the more-prominent ray-crater Copernicus lies within the eastern edge of the mare, distinctly with its bright ray materials sprawling over the darker material. On the northern edge of Oceanus Procellarum lies Sinus Roris.
There are several hypotheses about the origin of Oceanus Procellarum and a related asymmetry between the near and far sides of the Moon. One of the most attractive is that Procellarum was a result of an ancient giant impact on the near side of the Moon. The size of the impact basin has been estimated to be more than 3,000 kilometers, which would make it one of the largest craters in the Solar System. The impact likely happened very early in the moon's history: at the time when magma ocean still existed or just ceased to exist. It deposited 5–30 km of crustal material on the far side forming highlands. If this is the case, all impact related structures such as crater rim, central peak etc. have been obliterated by later impacts and volcanism. One piece of evidence in support of this hypothesis is concentration of incompatible elements (KREEP) and low calcium pyroxene around Oceanus Procellarum.
Other hypotheses include spatially inhomogeneous tidal heating during the Moon's formation and a late accretion of a companion Moon on the far side. The latter postulates that in addition to the present Moon, another smaller (about 1,200 km in diameter) moon was formed from debris of the giant impact. After a few tens million years it collided with the Moon and due to a small collisional velocity simply piled up on one side of the Moon forming what is now known as far side highlands.
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 on board. Their landing site, within 300m of Surveyor 3, has become known as Mare Cognitum.
- "Oceanus Procellarum". Gazetteer of Planetary Nomenclature. USGS Astrogeology. Retrieved 2010-08-23.
- DK Space Encyclopedia: The Near Side of the Moon
- Nakamura, R.; Yamamoto, S.; Matsunaga, T.; Ishihara, Y.; Morota, T.; Hiroi, T.; Takeda, H.; Ogawa, Y.; Yokota, Y.; Hirata, N.; Ohtake, M.; Saiki, K. (2012). "Compositional evidence for an impact origin of the Moon's Procellarum basin". Nature Geoscience 5 (11): 775. doi:10.1038/NGEO1614.
- Byrne, C. J. (2008). "A Large Basin on the Near Side of the Moon". Earth, Moon, and Planets 101 (3–4): 153–188. Bibcode:2007EM&P..101..153B. doi:10.1007/s11038-007-9225-8.
- Jutzi, M.; Asphaug, E. (2011). "Forming the lunar farside highlands by accretion of a companion moon". Nature 476 (7358): 69–72. doi:10.1038/nature10289. PMID 21814278.