World's largest radio telescope in China's karst
This is old news, but an interesting promotional/educational video and sort of cave related. This is the world's largest radio telescope. 500 meters in diameter, built in a large karst cockpit. It is in south-central Guizhou and most of us who have been to the karst of SW China have been aware of it, at least vaguely. Construction was started in 2008 and it became operational in September 1916. It is about three times more sensitive that our radio telescope at Arecibo in Puerto Rico, also built in a karst cockpit. It is an engineering marvel. DirtDoc https://youtu.be/7SRV3rnULO0 https://youtu.be/7SRV3rnULO0
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