We invite proposals for the use of the Arecibo 305-m telescope for the Thursday, September 6, 2018 (17:00 AST, 21:00 UTC) , deadline. These requests should be for telescope usage within the six-month (or in some cases one-year) period beginning January 1, 2019. This call does not include proposals for the use of the HF Facility for ionospheric studies. Read More

The Arecibo Observatory helped scientists demonstrate that Einstein’s theory of relativity applies even to objects with extreme gravity, such as neutron stars.

New observations by three of the world's largest radio telescopes (including the Arecibo Observatory) have revealed that an asteroid discovered last year is actually two objects, each about 3,000 feet (900 meters) in size, orbiting each other. Read More

The Asteroid Day Celebration @ AO - Special Event was held last Saturday 30th at the Angel Ramos Foundation Science & Visitor Center (SVC) with a series of lectures offered by local scientists and guest speakers. Read More