Are we alone in the universe? Live Science follows the researchers trying to answer that question and reports on what we've learned about aliens. From how scientists search for extraterrestrial life and whether the U.S. government is hiding evidence of "non-human intelligence" to the strange, scientific excuses for why humans haven't found aliens yet and the disturbing reason why aliens may never have visited Earth, our expert writers and editors tackle it all with the latest news, features and articles about extraterrestrial life.
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If life can exist in your stomach, it can exist on Mars. Here's what it might look like.
If life exists on other planets, it needs to be adaptable to extreme environments. To get a clue of what it might look like, we can turn to a surprising place: the human gut.
'Perhaps it's only a matter of time': Intelligent life may be much more likely than first thought, new model suggests
For decades, scientists assumed that life on Earth emerged through a chain of highly improbable flukes. But a new theory suggests it may have instead arrived just in time.
The existence of intelligent aliens is 'highly likely' — and they could await in our own galaxy
According to astronomers, there are approximately 200 billion trillion stars in our observable universe — chances are, there’s life out there somewhere.
Did people report seeing UFOs before the 20th century?
Are UFO sightings a 20th-century phenomena, or did people report seeing them earlier in history?
Alien life may look nothing like life on Earth — so how should we go about looking for it?
Alien life might look unlike anything we've ever seen on Earth. Trying to find evidence of these unknown organisms will require some creativity.
12 strange reasons humans haven't found alien life yet
Scientists have been searching for evidence of extraterrestrial life for decades. So, where are all the aliens? Here are 12 intriguing theories ...
'It's hard not to believe he saw something': Historian Greg Eghigian on how UFOs took over the world
What do UFO sightings tell us about ourselves? And will they ever be explained? Historian Greg Eghigian tells us how he's trying to find out.
The fastest-moving stars in the galaxy may be piloted by intelligent aliens, new paper suggests
To explore the galaxy and hunt for resources, intelligent aliens might need to turn their home stars into natural spaceships, a new paper suggests. A few known star systems might fit the bill.
UFO whistleblowers tell Congress 'we are not alone in the cosmos'
The latest congressional UFO hearing featured testimony from former military personnel who told representatives that excessive government secrecy hides the fact that we are not alone in the cosmos.
It would be easier to find aliens in a parallel universe than in our own, new multiverse study claims
A new model based on the famous alien-hunting Drake equation suggests that some parallel universes within the hypothetical "multiverse" could have higher chances of containing extraterrestrial life than our universe.
