Project ELT
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Project ELT, short for Extremely Large Telescope is a proposed optical telescope with a mirror of up to 100 meters. The exact size has not yet been finalized, but designs for a 30, 50, or 100 meter telescope are now being tested.
Current lens technology limits mirrors to being roughly 8 meters in a single piece. The next-largest telescopes currently are the twin 10-meter Keck Telescopes in Hawaii, which each use 36 hexagonal mirror fitted together to make a 10 meter mirror. The ELT would need to use a similar design. In addition, ELT would also need to use techniques to work around atmospheric distortion of incoming light, known as adaptive optics.
Project ELT has the aim of observing the Universe in greater detail than even the Hubble Space Telescope can.
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