Sumerian civilization appears to have evolved in Southern Mesopotamia around 4000 BC, while some historians place it as far ...

Add Yahoo as a preferred source to see more of our stories on Google. Collage of a telescope under a starry sky and a planet in space. Earthlings, brace yourselves: the galaxy may be emptier than your ...

Spacefaring civilizations are usually imagined as technological giants, centuries or millennia beyond anything humanity has ...

Advanced alien civilizations may communicate via a series of flashing lights, similar to how fireflies do, a new paper hints. This would potentially make extraterrestrials much harder to spot if we ...