![]() The smaller secondary is a particularly important change 4.2 m (14 ft) places it within the capabilities of multiple manufacturers, and the lighter mirror unit avoids the need for high-strength materials in the secondary mirror support spider. ![]() This reduced projected costs from 1.275 billion to 1.055 billion euros and should allow the telescope to be finished sooner. However, in 2011 a proposal was put forward to reduce overall size by 13% to 978 m 2, with a 39.3 m (130 ft) diameter primary mirror and a 4.2 m (14 ft) diameter secondary mirror. Įarly designs included a segmented primary mirror with a diameter of 42 metres (140 feet) and an area of about 1,300 m 2 (14,000 sq ft), with a secondary mirror with a diameter of 5.9 m (19 ft). Other sites that were under discussion included Cerro Macon, Salta, in Argentina Roque de los Muchachos Observatory, on the Canary Islands and sites in North Africa, Morocco, and Antarctica. On 26 April 2010, the European Southern Observatory (ESO) Council selected Cerro Armazones, Chile, as the baseline site for the planned ELT. History ESO Council meets at ESO headquarters in Garching bei München, Germany, 2012. The telescope passed the halfway point in its development and construction in July 2023, with completion and first light planned for 2028. The first stone of the telescope was ceremonially laid on, initiating the construction of the dome's main structure and telescope. By December 2014, ESO had secured over 90% of the total funding and authorized construction of the telescope to start, which will cost around one billion euros for the first construction phase. Construction work on the ELT site started in June 2014. On 11 June 2012, the ESO Council approved the ELT programme's plans to begin civil works at the telescope site, with the construction of the telescope itself pending final agreement with governments of some member states. As planned in 2011, the facility was expected to take 11 years to construct, from 2014 to 2025. The ELT is intended to advance astrophysical knowledge by enabling detailed studies of planets around other stars, the first galaxies in the Universe, supermassive black holes, and the nature of the Universe's dark sector, and to detect water and organic molecules in protoplanetary disks around other stars. The project was originally called the European Extremely Large Telescope ( E-ELT), but the name was shortened in 2017. It has around 250 times the light gathering area of the Hubble Space Telescope and, according to the ELT's specifications, would provide images 16 times sharper than those from Hubble. The observatory's design will gather 100 million times more light than the human eye, equivalent to about 10 times more light than the largest optical telescopes existing as of 2023, and will correct for atmospheric distortion. The telescope will be supported by adaptive optics, six laser guide star units, and multiple large science instruments. The design consists of a reflecting telescope with a 39.3-metre-diameter (130-foot) segmented primary mirror and a 4.2 m (14 ft) diameter secondary mirror. Part of the European Southern Observatory (ESO) agency, it is located on top of Cerro Armazones in the Atacama Desert of northern Chile. ![]() When completed, it will be the world's largest optical/ near-infrared extremely large telescope. The Extremely Large Telescope ( ELT) is an astronomical observatory under construction.
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