Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

For decades, scientists have tried to turn the question of alien life from late-night speculation into something you can ...

What does it take to detect a radio signal sent by extraterrestrial life to Earth? Two decades of work involving radio ...

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

A crowd-sourced search for alien intelligence called SETI@Home is in its final stages, analyzing 100 radio signals of ...

Is intelligent alien life out there in the Universe? Well, with scientists discovering new exoplanets every year, yeah, the ...

After reviewing almost 30 years of signals, University of California Berkeley researchers have identified 100 mysterious, ...

For centuries, humans have gazed at the stars and wondered whether we are alone in the universe. The question of ...

A composite view of Mars taken by the Viking I and II probes. NASA/USGS In September, NASA announced the discovery of a possible sign of life, known as a potential biosignature, on Mars. The ...

Real scientific efforts at universal communication have also involved mathematics and numbers. The covers of the Golden ...

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 ...

Explore how astronomers aim to identify signs of alien life by analysing the atmospheres of distant exoplanets through ...