Ground-based facilities that observe the sky at radio and millimeter wavelengths rather than visible light: the Arecibo Observatory in Puerto Rico, the Atacama Large Millimeter Array in Chile, the Very Large Array in New Mexico, and the Event Horizon Telescope, a global network of radio observatories linked to act as a single Earth-sized instrument. Belongs here: an Earth-based facility whose instruments detect radio or millimeter-wavelength radiation. Does not belong here: an Earth-based facility observing in visible light, grouped under Ground-Based Optical Observatories, or a facility in space, grouped under Space-Based Observatories.
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1. Wikipedia: Radio telescope
Wikimedia FoundationRadio telescope, history sectionQuote, Radio telescope, history section
Radio waves from space were first detected by engineer Karl Guthe Jansky in 1932 at Bell Telephone Laboratories in Holmdel, New Jersey using an antenna built to study radio receiver noise.
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