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Moonstone cabochon. The most common moonstone is of the orthoclase feldspar mineral adularia, named for an early mining site near Mt. Adular in Switzerland, now the town of St. Gotthard. [1] [better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens.
The area of sky in which it is located is visible a few degrees south of Sadr, just north of the open cluster NGC 6871; its apparent extent is as much as 17°, [2] which at a distance of 5000 light-years is equivalent to a real diameter of as much as 4600 light-years. [1]
In this map of the Observable Universe, objects appear enlarged to show their shape. From left to right celestial bodies are arranged according to their proximity to the Earth. This horizontal (distance to Earth) scale is logarithmic.
In 1999, the disc was found buried on the Mittelberg hill near Nebra in Germany. [10] It is dated by archaeologists to c. 1800–1600 BC and attributed to the Early Bronze Age Unetice culture. [11] [12] Various scientific analyses of the disc, the items found with the disc, and the find spot have confirmed the Early Bronze Age dating. [13] [14 ...
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The building blocks of life have been found on an alien asteroid, scientists have said. Samples taken by Nasa from the asteroid Bennu have not only the ingredients required to life but also show ...
Size comparison of the event horizons of the black holes of TON 618 and Phoenix A.The orbit of Neptune (white oval) is included for comparison. As a quasar, TON 618 is believed to be the active galactic nucleus at the center of a galaxy, the engine of which is a supermassive black hole feeding on intensely hot gas and matter in an accretion disc.
Sandakada Pahana, also known as Moonstone, is a unique feature of the architecture of ancient Sri Lanka. [ 1 ] [ 2 ] [ 3 ] It is an elaborately carved semi-circular stone slab, usually placed at the bottom of staircases and entrances.