Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

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

With the release of Disclosure Day, Steven Spielberg’s new film about aliens, a question as old as science fiction itself resurfaces: if aliens were to arrive on Earth, would they come to conquer us, ...

A planet with twice Earth's gravity produces creatures with different skeletal requirements, different muscular architecture, ...

From Project Hail Mary to Independence Day, Alien to Arrival, these alien movies are much better than Disclosure Day.

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

Scientists suggest that advanced aliens might not have physical bodies, challenging traditional views of extraterrestrial ...

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.

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, ...

Alien director Ridley Scott eventually returned to the franchise, but couldn't complete his ambitious plans. Here's what his unmade movie could have been about.

The newly discovered planet, Beta Pictoris d. (ESO/B. Sutlieff, M. Bonse et al.) One of the most exciting things about ...

After a two week expedition off the coast of Brazil, an international team of researchers discovered 31 new marine species, ...