An extremely large telescope (ELT) is a telescope of more than 20m diameter[1]. There are currently ten such telescopes in various stages of design or construction: A telescope (from the Greek tele = far and skopein = to look or see; teleskopos = far-seeing) is an instrument designed for the observation of remote objects. ...
These telescopes have a number of features in common, in particular the use of a segmented primary mirror (similar to the existing Keck telescopes), and the use of high-order adaptive optics systems. The European Extremely Large Telescope (E-ELT) is an extremely large telescope design proposed for the next-generation European Southern Observatory optical telescope with a mirror diameter of 42 meters. ... The Thirty meter telescope (TMT) (formerly called the California Extremely Large Telescope (CELT)) is a future large segmented-mirror optical and infrared extremely large telescope, proposed and run by a consortium made up by Caltech, the University of California, AURA, and ACURA. While still under design, completion is scheduled for... The Overwhelmingly Large Telescope (OWL) is a conceptual design by the European Southern Observatory organization for a telescope which was intended to have a single aperture of 100 meters in diameter, but was later scaled down to a 60 meter diameter telescope. ... The Giant Magellan Telescope is a ground-based telescope planned for completion in 2016. ... The W. M. Keck Observatory is home to the two largest optical/near-infrared telescopes at the 4,145 meter (13,600 ft) summit of Mauna Kea in Hawaii. ... A deformable mirror can be used to correct wavefront errors in an astronomical telescope. ...
References
^ See title of http://www.astro-opticon.org/fp5/skelcase.html and section 1 of http://www.aao.gov.au/instrum/ELT/ELTroadmap040917.pdf
External links
Australian National Workshop on Extremely Large Telescopes (ELTs)
The OPTICON ELT Working Group a Europe-wide research project
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