From NPR https://twitter.com/NPR on Twitter: The Arecibo Observatory has collapsed. Once the world's largest single-dish radio telescope, it was used to detect the first binary pulsar in 1974 a discovery that bolstered a key idea in Einstein's general theory of relativity. https://www.npr.org/2020/12/01/940767001/arecibo-observatory-telescope-collapses-ending-an-era-of-world-class-research?utm_campaign=npr