For five decades Arecibo was the largest single-aperture telescope in the world, used to study distant planets.

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Astronomers compare losing the observatory in Puerto Rico to losing a big brother. It was once the world's largest single-dish radio telescope. (Image credit: University of Central Florida)

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Observatory had been set to close after damage in August Scientists and Puerto Ricans mourn loss of historic facility A huge radio telescope in Puerto Rico that has played a key role in astronomical discoveries for more than half a century collapsed on Tuesday, officials said. Related: US to shut down famed huge Arecibo space telescope in Puerto Rico jungle Continue reading...

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