With its 1,000-foot reflector dish, the Arecibo Observatory in Puerto Rico is the world's largest single-dish radio telescope and most powerful radar. Frank Drake used it in 1974 to send the first CETI message. Credit: NAIC/Arecibo Observatory/NSF
| |
| |
With its 1,000-foot reflector dish, the Arecibo Observatory in Puerto Rico is the world's largest single-dish radio telescope and most powerful radar. Frank Drake used it in 1974 to send the first CETI message. Credit: NAIC/Arecibo Observatory/NSF |
|
|
|
