The Deep Space Network (DSN) is just the sort of tool aliens could one-day detect, transmitting from Earth. Credit: NASA/JPL What if the first signal ever detected from an alien lifeform wasn't a ...

Here's what you'll learn when you read this story: Even the most sophisticated radio arrays have not yet detected any signals that could have possibly been beamed through space by aliens. But maybe we ...

Add Yahoo as a preferred source to see more of our stories on Google. The Search for Extraterrestrial Intelligence (SETI) focuses on finding technosignatures—potential signs of alien technology. If we ...

A NASA-backed study reveals that alien civilizations could detect human signals sent to spacecraft. Radio transmissions aimed at Mars rovers and orbiters aren't fully contained, creating a 'spillover' ...