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The Fight for First Light: Extremely Large Telescopes

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The process of bringing next-generation giant telescopes online is a long and winding road prone to delays. Here’s how current projects are faring in the face of COVID-19 and other obstacles.

VALERIE C. COFFEY, SCIENCE WRITER

The 2020 U.S. Decadal Survey on Astronomy and Astrophysics, a type of survey in which astronomers set priorities to guide federal budgets during the next 10 years, is in the process of listing its most important projects. Asteroid detection and Mars exploration are high on the list, as is continued support of a new cadre of extremely large telescopes already under construction around the world, with effective mirror apertures measuring 20, 30, or 40 m in diameter. Astronomers hope these giant ground-based light buckets will provide capabilities exceeding anything else humans have ever built, and will witness new scientific paradigms such as life on other planets, the birth of new stars, and the formation of galaxies.

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Photonics Handbook
GLOSSARY
adaptive optics
Optical components or assemblies whose performance is monitored and controlled so as to compensate for aberrations, static or dynamic perturbations such as thermal, mechanical and acoustical disturbances, or to adapt to changing conditions, needs or missions. The most familiar example is the "rubber mirror,'' whose surface shape, and thus reflective qualities, can be controlled by electromechanical means. See also active optics; phase conjugation.
FeaturesEarth-based telescopesEarth-based observatoriesoptical telescopesKeck ObservatoryEuropean Southern ObservatoryExtremely Large TelescopeGiant Magellan TelescopeThirty Meter Telescopeadaptive optics

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