The first unmistakable signal from another intelligence may not be a cheerful greeting. A growing group of researchers is ...

If so, why haven’t they said hello? The humble residents of this pale blue dot have been on a quest to find an alien civilisation for more than a century. First, it was the “canals” of Mars. Then ...

Technosignatures are theoretical signs of technologically advanced alien civilizations, but so far, none of those civilizations have phoned home. Researchers from the Search for ExtraTerrestrial ...

A new paper posits that advanced alien civilizations may communicate through subtle flashes, like fireflies do on Earth. The ...

The Fermi Paradox, first devised by physicist Enrico Fermi in the 1950s, asks why we haven’t detected alien civilization yet, despite the vast universe teeming with countless potentially habitable ...

Sometimes it seems like we got to the galactic party late and everyone has already gone home. Our species only figured out how to get into orbit within the last century. Since then, we’ve flown ...

Renowned astrophysicist Neil deGrasse Tyson continues to dismiss the hypothesis of a Harvard University professor that a massive interstellar object careening toward the sun was sent by alien ...

The idea that our first confirmed alien signal might be a civilization’s final broadcast is rooted less in pessimism than in probability. If technological societies are fragile, then the cosmos could ...