Scientists have pieced together a pretty clear picture of what life was like on Earth thousands, even millions of years ago.

Are humans alone in the universe, or could intelligent alien civilizations exist somewhere beyond Earth? For more than 60 ...

For decades, science fiction writers have tried their best to prepare us for eventual contact with aliens. Their efforts are dominated by several recurrent tropes. There's the invasion by a warlike ...

Alien life may not need the kind of home humans instinctively search for. Some of the strangest possibilities begin once ...

What if aliens were building a massive power plant?Last time, I talked about the "Kardashev scale," which classifies 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 ...

Searching for extraterrestrial intelligence has so far primarily meant focusing on one particular type of signal—and that signal has normally been based on our own current cutting-edge technology. But ...

Suppose an alien civilization discovers Earth and decides to investigate. Before it chooses a landing site or considers how to introduce itself, it faces a less dramatic question: how much mass should ...

When ET phones home, it could be his last call. Contrary to sci-fi movie depictions, our first contact might not be with a super advanced alien civilization at the height of power. Rather, Ivy League ...

Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

In the coming month, humans are going to experience their first encounter with an alien civilization as predicted by blind Bulgarian mystic Baba Vanga in his 2026 year’s prophecy. Famed ...