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University of Hawaii 2.2-meter Telescope and moon, Mauna Kea, Big Island, Hawaii, USA Stock Photo - Alamy
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Calar Alto Astronomical Observatory 3.5 meter Telescope, located in Almería province in Spain on Calar Alto, a 2,168-meter-high (7,113 ft) mountain in Sierra de Los Filabres(ES). | sciencesprings
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File:Danish Faint Object Spectrograph and Camera instrument in the Danish 1,5 meter Telescope at La Silla.png - Wikimedia Commons
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Zeiss refractor telescope 40 cm for 5 meters focal length, built in 1935. Specola Vaticana Observatory, Castel Gandolfo (Italy Stock Photo - Alamy
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