Source: US Government research organizations
Completed in 1963 and stewarded by U.S. National Science Foundation since the 1970s, Arecibo Observatory has contributed to many important scientific discoveries, including the demonstration of gravitational waves from a binary pulsar, the first discovery of an extrasolar planet, composition of the ionosphere, and the characterization of the properties and orbits of a number of potentially hazardous asteroids.
More at https://www.nsf.gov/news/special_reports/arecibo/index.jsp?WT.mc_id=USNSF_51&WT.mc_ev=click
This is an NSF News item.