An image of Mars taken by NASA's rover has sparked theories that aliens may be hiding on the Red Planet.

A UFO researcher claims a Martian metropolis once existed on a vanished ocean's shore, sparking debate between enthusiasts and scientists over the Cydonia region's landforms and their origins.

Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature of the universe.

Alien invasion movies are fun, but an all-star cast makes them all the more appealing. Tune in as we compile the best ...

A planet with one side permanently roasting and the other frozen in endless darkness might still have a chance of supporting life. Researchers found that heat inside a tidally locked exoplanet could ...

Using the Keck Observatory, astronomers measured the spins of dozens of giant planets and brown dwarfs orbiting distant stars. They found that giant planets can spin faster than much more massive ...

Scientists have identified two possible exoplanets where aliens could have lived for five billion years before life on Earth ever began. The planets could exist in our own Milky Way galaxy and share ...

The newly discovered exoplanets, designated as GJ 9827 b, c and d, are located fairly close to their host star, completing orbits within 6.2 days. ESO A nearby 'super‑Earth' just 25 light years from ...

Add Yahoo as a preferred source to see more of our stories on Google. Last week, the discovery of an Earth-sized planet orbiting in the habitable zone of our Sun's nearest neighbour sent ripples ...

Few horror franchises have had the impact of Alien. Over the last four-plus decades, there have been nine movies, several video games and comics, and the hit TV series, Alien: Earth. The films have a ...

Most Americans believe that aliens exist — and more than one in five think they’ve already paid our planet a visit, according to an out-of-this world new poll. Some 63% of Americans said they’re ...