SETI

A new search for alien signals focuses on planetary transits, when exoplanets pass right in front of their suns.

Scientists have proposed another use for the world's largest gravitational wave observatory: scanning for the ripples in space-time left in the wake of gargantuan alien spaceships.

Two SETI telescopes came together for an evening in May to scan a zone where a purported alien signal emerged in 1977. They saw no sign of life, but will likely return for more searches.

We're unprepared for when E.T. reaches out to us. A team of experts is determined to change that.

In a new paper, scientists outline how we can look for clues any alien visitors to our solar system may have left behind.

The knowledge that we're not alone in the universe could have far-reaching effects on our view of ourselves and our place in the universe. But it's tough to get more specific than that.

Astronomer Frank Drake, who pioneered the modern search for intelligent life in the universe, passed away Friday (Sept. 2)at the age of 92.

Researchers suggest we may be able to use gravitational lensing to amplify radio waves, allowing us to listen in on communication signals passing through our solar system.

We should be intrigued, but not too excited (yet). Any interesting signal has to go through a lot of tests to check whether it truly carries the signature of extraterrestrial technology.