If ancient alien explorers ever traipsed through Earth's cosmic neighborhood, could it be possible they left behind some interstellar litter on the moon?

With billions of potentially habitable worlds scattered across the universe, alien civilizations should be out there — yet decades of searching have produced no confirmed contact. From the Fermi ...

Most of our experience with the Search for Extraterrestrial Intelligence (SETI) has focused on capturing radio signals that ...

The search for advanced alien civilizations goes far beyond listening for radio signals, exploring possibilities such as laser beacons, neutrino communication, technosignatures, Dyson swarms and ...

Researchers propose that tiny technological remnants from extinct alien civilizations could have landed on the moon after ...

Is anybody out there? Probably. Most stars have planets; we've discovered more than 6,000 exoplanets thus far, and the most basic statistics point toward the existence of countless potentially ...

Are there really aliens in this vast universe? To this question that everyone has wondered about at least once, the common opinion from an astronomical perspective is that "the possibility of their ...

The age of our universe and the commonality of Earth-like planets indicates the possibility of alien civilizations either ...

(Esben_H/iStock/Getty Images Plus) The Fermi paradox asks: If there are other civilizations in the Universe besides ours, why haven't we yet made contact? Researchers who study this paradox – also ...

For decades, SETI researchers have focused on finding narrow-band radio signals that might stand out from the natural universe. But what if an advanced civilization that wanted to communicate would ...

Add Yahoo as a preferred source to see more of our stories on Google. The great physicist Enrico Fermi first posed the challenging question over half a century ago, wondering why we appear to be alone ...

Aliens lived on a certain planet.They had built a civilization far more advanced than Earth's.They had overcome disease, aging, and even death. As a result, the planet's surface became too small, so t ...