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Ultralight Sightseeing - Puerto Rico - Arecibo Observatory
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Ultralight Sightseeing - Puerto Rico - Arecibo Observatory

The Arecibo Observatory is in Puerto Rico. It is owned by the US National Science Foundation. The main instrument was a 1,000-foot reflector dish built into a natural sinkhole. It was the world's largest single-aperture telescope from 1963 until 2016.

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