Scientists now believe that our solar system may have once been visited by something very large indeed.
Biologist Prof Tim Coulson has suggested that one species in particular has the potential to dominate the planet.
The rhesus monkeys have so far managed to evade capture after escaping from a laboratory in South Carolina.
We tend to assume that an alien civilization would have its own home world - but what if they didn't actually need one ?
A new study has highlighted the potential for finding habitable extrasolar worlds around F-type stars.
The Moon will be joined by a second natural satellite for a short time beginning this Sunday.
The smallest planet in our solar system may be hiding a treasure with a value beyond imagination.
This relatively nearby world, which is a lot larger than our own, is situated approximately 49 light-years away.
If an alien civilization has terraformed the atmosphere of a distant planet, we may be able to find it.
A planet thought to be the real-life equivalent of Spock's homeworld Vulcan might not actually exist after all.
Luring inquisitive extraterrestrials to our planet using nuclear radiation seems like a bit of a shot in the dark.
Has the James Webb Space Telescope found life on a distant extrasolar world or could there be an alternative explanation ?
A type of rare, though extremely energetic and deadly cosmic event is able to wipe out whole planets.
A gas discovered in the atmosphere of this distant extrasolar planet is 'only produced by life', say scientists.
A team of planetary scientists has found new evidence of an undiscovered planet in the outer solar system.
The SpaceX CEO has some ambitious plans to build a thriving city on the Red Planet within as little as 20 years.
Astronomers have identified a potentially habitable extrasolar planet situated around 137 light-years away.
Samples collected from Jezero crater may contain fossil evidence of ancient microbial life on the Red Planet.
Declassified government documents suggest that a lack of UFO tracking represents a threat to national security.
NASA's decade-old rover recently spotted something rather familiar while trundling across the surface of the Red Planet.