1. Construction on Arecibo began in the summer of 1960.

2.Arecibo opened on November 1, 1963.

3.Arecibo runs 24 hours a day.

4.Arecibo is the world's largest single-dish radio telescope.

5.Arecibo is 305 meters long!

6.On October 1, 1969 NSF (National Science Foundation) took over Arecibo.

    Arecibo is an observatory in the northern mid west of Puerto Rico and is located by the Atlantic Ocean. Arecibo is part of the National Astronomy and Ionosphere Center (NAIC), a national research center operated by Cornell University.