The best way to find alien technosignatures is to look for ones that have long survived their creators, according to a new ...

Newly declassified Pentagon UFO files have reignited debate over a possible alien presence on the Moon after a previously ...

The Donald Trump administration has released numerous files about reported UFO sightings as well as bizarre claims and ...

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 ...

Buzz Aldrin is quoted as having made three observations, one of which was of something with a "sizeable dimension." ...

Scientists propose that a moon base could act as an isolated first line of biological defense against extraterrestrial ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists have long believed Saturn’s moon Titan hid a massive underground ocean, but new research suggests something even ...

A NASA‑linked study argues that alien probes could already be in our Solar System, but our surveys are still too crude to ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...