The CIA just turned over 2,700 pages of UFO-related material to The Black Vault, a free repository of UFO records online.
Harvard astrophysicist Avi Loeb has reignited a debate about whether alien life can explain an object that visited the solar system in 2017 in a scathing new book.
The White House has laid out a plan for overhauling the federal government's planetary-protection rules, which work to prevent contamination between Earth and other potentially habitable worlds.
If you're feeling lonely, take solace in remembering that there are countless tiny living things floating tens of thousands of feet above your head.
From the best places to find them to what they might breathe, here are the newest clues we discovered about alien life.
If intelligent aliens visit the Earth, it would be one of the most profound events in human history.
Astronomers hunting for radio signals from alien civilizations have reportedly detected an "intriguing signal" from the direction of Proxima Centauri, the nearest star system to the sun.
The Martian underground may have been habitable billions of years ago even if the planet's surface was a dry, frigid wasteland.
Holding a pristine piece of Mars in a lab on Earth is among the most ambitious dreams of planetary scientists, and NASA and its European counterpart want to make the dream a reality.
NASA's Mars rover Curiosity has taken another selfie, just a few months before its six-wheeled cousin joins it on the Red Planet.
The life-hunting Mars 2020 Perseverance rover, which launched on July 30, is scheduled to land inside Jezero Crater on the afternoon of Feb. 18, 2021.
Saturn's moon Titan just keeps getting weirder — and more tantalizing when it comes to scientists' hopes for life beyond Earth.
On average, each sunlike star in the Milky Way likely harbors between 0.4 and 0.9 rocky planets in its "habitable zone," researchers have found.
As humanity ramps up its search for alien life, we should keep in mind that E.T. might be hunting for us as well.
Two dozen alien worlds may be as good as or better than Earth for life as we know it, a new study finds.
Powerful stellar eruptions could pose a serious challenge to the origin and evolution of life around the universe, a new study suggests.