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In May 2011, 615–1410 ppm water in melt inclusions in lunar sample 74220 was reported, [158] the famous high-titanium "orange glass soil" of volcanic origin collected during the Apollo 17 mission in 1972. The inclusions were formed during explosive eruptions on the Moon approximately 3.7 billion years ago. This concentration is comparable with that of magma in Earth's upper mantle. Although of considerable selenological interest, this insight does not mean that water is easily available since the sample originated many kilometers below the surface, and the inclusions are so difficult to access that it took 39 years to find them with a state-of-the-art ion microprobe instrument. Swearer, Donald K.; Premchit, Sommai (1998). The Legend of Queen Cama: Bodhiramsi's Camadevivamsa, a Translation and Commentary. Albany, New York: State University of New York Press. ISBN 0791437752 . Retrieved 26 February 2021. The Moon is by size and mass the fifth largest natural satellite of the Solar System, categorizeable as one of its planetary-mass moons, making it a satellite planet under the geophysical definitions of the term. [18] It is smaller than Mercury and considerably larger than the largest dwarf planet of the Solar System, Pluto. While the minor-planet moon Charon of the Pluto-Charon system is larger relative to Pluto, [f] [68] the Moon is the largest natural satellite of the Solar System relative to their primary planets. [g]
The Moon is, beside when passing through Earth's shadow during a lunar eclipse, always illuminated by the Sun, but from Earth the visible illumination shifts during its orbit, producing the lunar phases. [19] The Moon is the brightest celestial object in Earth's night sky. This is mainly due to its large angular diameter, while the reflectance of the lunar surface is comparable to that of asphalt. The apparent size is nearly the same as that of the Sun, allowing it to cover the Sun almost completely during a total solar eclipse. From Earth about 59% of the lunar surface is visible over time due to cyclical shifts in perspective ( libration), making parts of the far side of the Moon visible.
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Nō̜. Na Pāknam (1985). The Relationship Between the Art and History of the Thai People. Office of the National Cultural Commission. The surface is exposed to drastic temperature differences ranging from 140°C to −171°C depending on the solar irradiance.
It was a lifetime’s work. His first, much smaller Moon map was published in 1924. The first edition of this map was made 1946, but later editions were added with detail from further observation. The one we have on display is the third edition, published in 1951. Wilkins was still observing up to his death - plans for further maps of the Moon were never realised. How was the Moon map used? Isotope dating of lunar samples suggests the Moon formed around 50million years after the origin of the Solar System. [37] [38] Historically, several formation mechanisms have been proposed, [39] but none satisfactorily explains the features of the Earth–Moon system. A fission of the Moon from Earth's crust through centrifugal force [40] would require too great an initial rotation rate of Earth. [41] Gravitational capture of a pre-formed Moon [42] depends on an unfeasibly extended atmosphere of Earth to dissipate the energy of the passing Moon. [41] A co-formation of Earth and the Moon together in the primordial accretion disk does not explain the depletion of metals in the Moon. [41] None of these hypotheses can account for the high angular momentum of the Earth–Moon system. [43] Desakura (February 24, 2020). "Where does the Mon Pak Lad shortcut?". Stationremodel . Retrieved August 7, 2020. After the year 1000 CE, the Mon people faced constant pressure from Tai migrations from the north and Khmer invasions from the east. [57] :75,76 Many Dvaravati Mons fled to present-day Lower Myanmar, while their descendants, the Nyah Kur people, still reside in Northeastern Thailand. Despite the pressure from the Northern Thai people, the Hariphunchai kingdom managed to survive as a Mon outpost in Northern Thailand. Warisara Anantato (2017). "Camadevi Worship: Legend Reproduction and Social Space Construction" (PDF) . Retrieved 26 February 2021.If the Earth were a water world (one with no continents) it would produce a tide of only one meter, and that tide would be very predictable, but the ocean tides are greatly modified by other effects: The Mon Floating Boat Festival is another traditional festival celebrated during the Mon New Year. It features boat races, music, dance, feasting, releasing lanterns, and gift exchanging. The festival brings the Mon community together to make offerings for peace and prosperity. [112] [113] [114] Peiros, Ilia (2011). "Some thoughts on the problem of the Austro-Asiatic homeland" (PDF). Journal of Language Relationship. 6: 101–113. doi: 10.31826/jlr-2011-060110. S2CID 212688587 . Retrieved April 12, 2021.
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