On November 16, 1974, humans sent their first message to the stars in an attempt to contact extraterrestrials. They did this using what was then the largest radio telescope in the world, located at ...

In 1963, the Arecibo Observatory became operational on the island of Puerto Rico. Measuring 305 meters (~1000 ft) in diameter ...

For nearly six decades, the Arecibo Observatory in Puerto Rico stood as a monument to human curiosity, exploration, and technological brilliance. Once the world’s largest radio telescope, Arecibo ...

A crowd-sourced search for alien intelligence called SETI@Home is in its final stages, analyzing 100 'signals of interest' with the world's largest radio telescope. When you purchase through links on ...

What does the discovery of a binary pulsar in 1974, the discovery of the first exoplanets, and the most powerful message humans have ever sent out into space all have in common? They all happened at ...

Five years after the collapse of the Arecibo Observatory telescope — the world’s largest single-dish radio telescope until 2016, when China completed a larger one — space physicist Qihou Zhou is ...