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Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. . Six locations were sampled directly during the crewed Apollo program landings from 1969 to 1972, which returned 382 kilograms (842 lb) of lunar rock and lunar soil to Earth [8] In addition, three robotic Soviet Luna ...
They do not contain any water, but are believed to have been formed from molten rock from the Moon's mantle coming out onto the surface of the Moon. This list also includes the one oceanus and the features known by the names lacus, palus and sinus. The modern system of lunar nomenclature was introduced in 1651 by Riccioli. [1]
The Pre-Nectarian period is defined from the point at which the lunar crust formed, to the time of the Nectaris impact event. Nectaris is a multi-ring impact basin that formed on the near side of the Moon, and its ejecta blanket serves as a useful stratigraphic marker. 30 impact basins from this period are recognized, the oldest of which is the South Pole–Aitken basin.
There are many theories about how the moon formed, but scientists mostly agree that about 4.5 billion years ago, a Mars-size object or a series of objects crashed into Earth and launched enough ...
It is the largest, oldest, and deepest basin recognized on the Moon. [1] It is estimated that it was formed approximately 4.2 to 4.3 billion years ago, during the Pre-Nectarian epoch [2] (with radiometric dating of lunar zircons proposed to originate from the basin suggesting a precise age of 4.338 billion years [3] [4]).
The surface around Tycho is replete with craters of various sizes, many overlapping still older craters. Some of the smaller craters are secondary craters formed from larger chunks of ejecta from Tycho. It is one of the Moon's brightest craters, [3] with a diameter of 85 km (53 mi) [4] and a depth of 4,700 m (15,400 ft). [1]
The Moon formed after a collision 4.5 billion years ago between the young Earth and a Mars-sized object, called Theia - but what happened next?
The first lunar samples from the moon’s far side differ in some interesting ways from those collected from the near side, according to two new studies. ... Most of the fragments formed around 2. ...