For 10 points, name this largest single telescope in the world, whose 1000-foot collecting dish is located in a natural depression on the north shore of Puerto Rico.
Formally known as the National Astronomy and Ionosphere Center, shortly after its opening in 1963, this facility determined the correct rotation period of Mercury. It also provided the first direct image of an asteroid, had a role in intelligence during the Cold War, and was used for the SETI@home project. Despite its fixed location, it is capable of viewing a 40-degree swath of the sky, between 1 degree South and 39 degrees North. For 10 points, name this largest single telescope in the world, whose 1000-foot collecting dish is located in a natural depression on the north shore of Puerto Rico.
Formally known as the National Astronomy and Ionosphere Center, shortly after its opening in 1963, this facility determined the correct rotation period of Mercury.
{Arecibo} Observatory or {Arecibo} radio telescope