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

“There is a silence in the night sky that has bothered me for as long as I can remember.” That line, attributed to Richard Feynman, lands because it gets at a simple, stubborn feeling. The sky looks ...

Add Yahoo as a preferred source to see more of our stories on Google. A high-frequency SETI search using ALMA opened new radio bands and showed that past surveys may have covered millions more stars. ...

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 ...

Johnston is in the midst of scaling up Starcloud, working through technical issues, and raising hundreds of millions of dollars. So he’s pretty busy. But Johnston also wants to send a mission to the ...

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 ...

Just over 40 years ago, in his novel Contact, astronomer Carl Sagan imagined what it would be like to detect radio signals beamed from other intelligent lifeforms in the galaxy. In the story, these ...

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 ...

Black holes appear built to hide energy, not advertise it. Yet a civilization wrapping one in vast collectors could create a detectable glow, turning one of the universe’s darkest objects into a ...

Hollywood makes initiating alien contact seem much easier than it has proven to be. In E.T. the Extraterrestrial, E.T. got stranded on earth when his alien compadres abandoned their botany mission. In ...