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extremely large telescope

(optical telescope with a 20+ meter aperture)

Extremely large telescope (ELT) is a general term for a very large telescope, commonly using 20 meters as a defining minimum aperture. As of 2017, some are funded and under construction but none complete and the largest current telescopes have apertures of about 10 meters. A typical ELT design is to use a segmented mirror with adaptive optics.

Current plans and construction:

The E-ELT has taken the name the Extremely Large Telescope or the ELT.

(telescope type,reflector)

Referenced by:
European Extremely Large Telescope (E-ELT)
Giant Magellan Telescope (GMT)
Giant Segmented Mirror Telescope (GSMT)
Thirty Meter Telescope (TMT)