This Puerto Rican Telescope Was Built in a Massive Sinkhole
In 1958, the Pentagon wanted to build a 1,000-foot-long telescope for its ballistic missile program. They ended up building it inside a massive Puerto Rican sinkhole. (01:56)
In 1958, the Pentagon wanted to build a 1,000-foot-long telescope for its ballistic missile program. They ended up building it inside a massive Puerto Rican sinkhole. (01:56)