At nearly twice Earth's size with a denser atmosphere, this fictional world hosts creatures that dwarf anything alive today, ...

Why are scientists taking unidentified aerial phenomena seriously? Because every answer matters for science, national security, and the people whose lives are changed by these experiences.

Harvard astrophysicist Avi Loeb has been appointed as the head of a new White House group to study UFOs, or unidentified ...

A Soviet astronomer in the 1960s proposed a scale to classify hypothetical alien civilizations. Here’s why the framework is ...

Scientists have identified new clues that could help astronomers spot one of the most famous hypothetical alien ...

From Nevada’s Area 51 mythology to McMinnville, Oregon’s UFO Fest, alien lore continues to turn curiosity, conspiracy, and ...

The search for life beyond Earth has always been full of surprises. Strange radio signals have sparked excitement. Odd gases on distant worlds have raised questions. Even ordinary objects have been ...

Eventually, we'll launch a mission dedicated solely to studying an interstellar object. When that day comes, which one should ...

Explaining the passage of time has been a gnarly problem in physics basically forever, but physicist and computer scientist ...

In an experiment to see if AI can detect and even confirm alien life, the answer is a resounding yes. The rest of this ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.