After the collapse of the world’s second-largest radio telescope in Puerto Rico on Tuesday, China’s massive 500 metre Aperture Spherical Radio Telescope (FAST) is now the only giant, single-dish telescope in the world – but it will not open to global scientists until next year.The Arecibo Observatory, suspended by cables connected to three towers in a sinkhole, collapsed on Tuesday after the telescope’s 900-ton instrument platform fell onto the reflector dish more than 400 feet below, according…

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