https://phys.org/news/2020-12-huge-puer ... scope.html
Huge Puerto Rico radio telescope, already damaged, collapses
A huge, already damaged radio telescope in Puerto Rico that has played a key role in astronomical discoveries for more than half a century completely collapsed on Tuesday.
The telescope's 900-ton receiver platform fell onto the reflector dish more than 400 feet below.
The U.S. National Science Foundation had earlier announced that the Arecibo Observatory would be closed. An auxiliary cable snapped in August, causing a 100-foot gash on the 1,000-foot-wide (305-meter-wide) dish and damaged the receiver platform that hung above it. Then a main cable broke in early November.