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The GTC began its preliminary observations on 13 July 2007, using 12 segments of its primary mirror, made of Zerodur glass-ceramic by the German company Schott AG.Later, the number of segments was increased to a total of 36 hexagonal segments fully controlled by an active optics control system, working together as a reflective unit.
Many modern telescopes and observatories are located in space to observe astronomical objects in wavelengths of the electromagnetic spectrum that cannot penetrate the Earth's atmosphere (such as ultraviolet radiation, X-rays, and gamma rays) and are thus impossible to observe using ground-based telescopes. [1]
Salar de Uyuni (or "Salar de Tunupa") [1] is the world's largest salt flat, or playa, at 10,582 square kilometres (4,086 sq mi) in area. [2] [3] It is in the Daniel Campos Province in Potosí in southwest Bolivia, near the crest of the Andes at an elevation of 3,656 m (11,995 ft) above sea level.
In 2000 a whirlpool there caught student divers, resulting in fatalities. [14] A short-lived whirlpool sucked in a portion of the 1,300-acre (530 ha) Lake Peigneur in Louisiana, United States after a drilling mishap on November 20, 1980. This was not a naturally occurring whirlpool, but a disaster caused by underwater drillers breaking through ...
Instead of having mirrors over the sink, many Disney guests have noticed instead there’s a full-length mirror by the door so people can check their appearance on their way out.
Map of world's major seamounts. A list of active and extinct submarine volcanoes and seamounts located under the world's oceans. There are estimated to be 40,000 to 55,000 seamounts in the global oceans. [1] Almost all are not well-mapped and many may not have been identified at all. Most are unnamed and unexplored.
China says it has discovered the world’s largest known deposit of gold, ... In all, there could be over 1,000 metric tonnes of the precious metal at the site which, at current prices, would ...
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