Mare Nectaris

Mare Nectaris is a lunar mare on the Moon's near side. Its Latin name means “Sea of Nectar,” following the traditional naming convention that gives broad, dark lunar plains poetic names associated with seas. It lies south of Mare Tranquillitatis and southwest of Mare Fecunditatis. The Montes Pyrenaeus mountain range forms much of its eastern boundary, while Sinus Asperitatis joins its northwestern edge. The mare covers approximately 84,000 square kilometers. It occupies the central portion of a substantially larger impact basin measuring about 860 kilometers across. The basin formed roughly 3.8–3.9 billion years ago, and its formation is used to mark the beginning of the Nectarian period in the lunar geological timescale. The best-preserved section of the basin rim is Rupes Altai, located in the southwestern part of the basin. Mare Nectaris itself is younger than the impact basin that contains it. The basin was later flooded by volcanic lava, producing the relatively dark plain visible from Earth. The mare deposits are approximately 1,000 meters deep and include material associated mainly with the Nectarian period and the Lower Imbrian epoch, together with deposits from the Upper Imbrian epoch. Geological evidence indicates that subsidence affected the western margin, where several arcuate grabens developed. Several prominent craters surround or intersect the mare. Fracastorius, a lava-filled crater about 124 kilometers in diameter, merges with the southern shoreline. Near the northwestern margin is a notable group of large craters: Theophilus, Cyrillus, and Catharina, each approximately 100 kilometers across. Daguerre, in the northern part of the mare, is a ghost crater whose original structure has been largely buried by lava. Theophilus is younger than the mare deposits beside it and belongs to the Eratosthenian period. Mare Nectaris is also important in lunar geophysics because a mass concentration, or mascon, was detected near its center. The anomaly was identified in 1968 through Doppler tracking of five Lunar Orbiter spacecraft and later confirmed and mapped in greater detail by missions including Lunar Prospector and GRAIL. As a named lunar surface feature rather than a commercial enterprise, Mare Nectaris has no corporate headquarters, commercial product portfolio, executives, or conventional brand-management activity.

Mare Nectaris is a volcanic plain on the near side of the Moon. Its present surface reflects two major geological stages: the formation of a large impact basin and the later emplacement of basaltic lava. The basin, approximately 860 kilometers in diameter, formed about 3.8–3.9 billion years ago. This event is conventionally associated with the start of the Nectarian period, a division of lunar geological history named after Mare Nectaris. After the impact basin formed, volcanic activity filled its central depression with lava. The resulting mare deposits are younger than the basin itself and reach an estimated depth of about 1,000 meters. Their ages span chiefly the Nectarian period and the Lower Imbrian epoch, with additional material assigned to the Upper Imbrian epoch. Cooling, loading, and subsequent subsidence contributed to the development of arcuate grabens along the western margin. The feature's surrounding landscape preserves evidence of multiple later impacts. Fracastorius, a large crater on the southern edge, was partly flooded by lava and merges with the mare. Theophilus, Cyrillus, and Catharina form a prominent crater group near the northwestern coast. Theophilus is geologically younger than the mare deposits and is assigned to the Eratosthenian period. Daguerre is a ghost crater in the northern mare, meaning that lava has almost entirely covered its original rim and interior structure. The Montes Pyrenaeus border the eastern side, and Rupes Altai preserves a substantial portion of the parent basin's southwestern rim. Mare Nectaris also became a target of lunar gravitational investigation. In 1968, Doppler measurements from the five Lunar Orbiter spacecraft revealed a mass concentration beneath or near the center of the mare. Later lunar missions, including Lunar Prospector and the GRAIL gravity-mapping mission, confirmed and refined knowledge of this mascon. The feature is therefore significant both as a visible lunar plain and as a natural laboratory for studying impact-basin formation, volcanic flooding, crustal subsidence, and variations in the Moon's internal mass distribution. Although supplied as a brand subject, Mare Nectaris is not a company, product, or consumer-facing brand. It is an astronomical proper name. Accordingly, commercial fields such as founding date, ownership, headquarters, products, campaigns, scandals, and leadership do not apply.

• 1968

  Central mascon detected

  [1]Mare Nectarisen.wikipedia.org

  Doppler tracking of five Lunar Orbiter spacecraft identified a gravitational mass concentration near the center of Mare Nectaris.

• Formation of the Nectaris impact basin

  [1]Mare Nectarisen.wikipedia.org

  A major impact created the approximately 860-kilometer-wide basin that now contains Mare Nectaris. The event is used to mark the beginning of the Nectarian period in lunar geological chronology.

• Volcanic flooding creates the mare plain

  [1]Mare Nectarisen.wikipedia.org

  Later basaltic lava filled the basin's central depression, forming the dark plain recognized today as Mare Nectaris. The lava deposits are younger than the impact basin and are about 1,000 meters deep in places.

• Mascon mapped by later lunar missions

  [1]Mare Nectarisen.wikipedia.org

  Lunar Prospector and GRAIL later confirmed and mapped the mare's gravitational anomaly at higher resolution.

A named lunar geological feature and scientific reference point, not a commercial brand.

1. 1Mare Nectarisen.wikipedia.org