The Arecibo Observatory in Puerto Rico.
As the site of the world's largest single-dish radio telescope, the Arecibo Observatory in Puerto Rico is one of the largest centers for research in radio astronomy, planetary radar and terrestrial aeronomy. Every year about 200 scientists visit the observatory. The huge "dish" is 1000 feet (305 meters) in diameter, 167 feet (51 meters) deep and covers an area of about twenty acres (0.08 square kilometers).
Credit: NAIC Arecibo Observatory, a facility of the NSF
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