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

This deep dive tours fictional worlds ranging from a tidally-locked planet crawling with giant slow-moving "starfish" to a gas giant where whale-sized animals float through the sky.

On the fictional planet Veteris, creatures blur every line between plant and animal — walking flowers, photosynthetic ...

"We had previously seen that AI has a big Achilles heel when it is trying to classify things that are unlike the things in ...

The plants outside your window carry a hidden geography. Many arrived from distant continents. A new global forecast shows that mix is about to shift, in ways few people notice until it takes hold.

For instance, what if we really are being visited by aliens from other worlds and they turn out to be aggressive, violent, ...

Star Trek can usually make rubber forehead aliens not just cool, but turn them into pop culture icons. Their five worst ...

Before his death, Stephen Hawking consistently warned humanity against contacting aliens. As interest in UFOs and little ...

Deep beneath the oceans' crashing waves lies a hidden landscape more alien than many of us could ever dream. Below the ...

From the Greys to the Nordics, these aliens appear frequently across abduction stories and science fiction tales.

There’s no data to suggest that aliens exist. However, if we believed they existed and came to Earth, our planet would offer them a somewhat risky buffet. There is liquid water, as well as salts, ...

Beneath the icy silence of Antarctica's famous Dry Valleys lies a world so unusual that it often resembles another planet. Invisible to the naked eye, microscopic organisms survive in some of the ...