Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

A civilization capable of interstellar travel may also be one that has moved beyond conquest, excess and ecological ...

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 ...

Our search for technosignatures—clear signs of advanced civilizations beyond Earth—takes many forms. Many are driven by the famous Drake equation, which attempts to estimate how many technological ...

Add Yahoo as a preferred source to see more of our stories on Google. Distance, light speed, biology, and time may explain why alien civilizations never meet. (CREDIT: Wikimedia / CC BY-SA 4.0) "There ...

The mathematical certainty that 'they' definitely exist in the universeWhen looking up at the night sky, everyone has surely ...

The search for alien radio signals has spent decades listening in a familiar part of the spectrum. A first-of-its-kind survey now suggests that unexplored higher frequencies could widen the hunt, ...

There are, by various estimates, several trillion planets within what is known as the Local Group of galaxies—our closest galaxy neighbors, including our own Milky Way. Many of these planets are ...

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 called the Great Silence – generally ...

"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 ...