It's hard to imagine a time before the invention of the wheel, yet many civilizations failed to come up with it.
Various space missions have sent signals into deep space and the earliest possible response time is fast approaching.
We tend to assume that an alien civilization would have its own home world - but what if they didn't actually need one ?
Two groups of rival astronomers are allegedly vying to publish confirmed evidence of an intelligent alien civilization.
Technological alien civilizations could render their own home-worlds uninhabitable within 1,000 years.
The Harvard astrophysicist believes that we may find trash from alien civilizations within the vicinity of the Earth.
Throughout the history of civilization, we've been constantly plagued by all manner of horrific and deadly diseases.
Archaeologists have discovered ancient drawings thought to have been created by a long lost civilization.
Scientists have come up with another possible way to look for intelligent alien civilizations: failing warp drives.
If an alien civilization has terraformed the atmosphere of a distant planet, we may be able to find it.
Are we alone in the universe ? Scientists have taken another stab at finding out how common civilizations might be.
What if artificial intelligence was an inevitable roadblock that all intelligent civilizations must overcome ?
Analyzing astronomical data for evidence of alien technosignatures could point us to extraterrestrial civilizations.
A type of rare, though extremely energetic and deadly cosmic event is able to wipe out whole planets.
SETI's Bill Diamond is not particularly convinced that we have ever been visited by members of an alien civilization.
If the universe is teeming with intelligent alien civilizations, why have we still not been contacted by them ?
Richard van Oort takes a look at intelligence and its role in the existential threats that our civilization currently faces.
We assume that aliens would be peaceful, but what if we contacted a civilization that wanted to colonize Earth ?
Professor Nello Cristianini investigates how exactly artificial intelligence might bring about the doom of civilization.
Researchers uncovered the enormous, previously unknown civilization by conducting LiDAR surveys of the region.