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Built into a sinkhole, the 305m-wide Arecibo telescope reigned as the largest radio telescope in the world for over half a century. Among other things, in 2007 it detected the first repeating fast radio burst, proving that they aren’t caused by one-off cataclysmic events such as stellar collisions. It was damaged beyond repair in 2020 when two of its supporting cables snapped. On what island is it located?

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