Arecibo
  • noun the site on Puerto Rico of the world’s largest single dish radio telescope, 305 m in diameter, made by excavating an existing crater
  • Site on Puerto Rico of the world’s largest single dish radio telescope, made by excavating an existing crater. As well as being powerful enough to warm the upper atmosphere when used as a transmitter, it has been used as a detector and transmitter in attempts to communicate with extraterrestrial intelligence.

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