The idea that an advanced civilization existed on Earth long before humans is fascinating, but scientists aren't convinced.

For centuries, the Amazon rainforest has been seen as one of the last truly unexplored places on Earth. Covering millions of ...

SPRINGFIELD, Mo. — Archaeologists from Missouri State University are confirming the existence of a previously unknown ancient civilization hidden deep within the Brazilian Amazon, using advanced ...

How could the principle of "radical mundanity" proposed by the Fermi paradox help explain why humans haven't found evidence of extraterrestrial technological civilizations (ETCs)? This is what a ...

At its peak, the ancient Indus River Valley civilization featured gridded streets, multistory brick homes, flush toilets and bustling shops. Its people traded gold, precious stones and items such as ...

Earthlings, brace yourselves: the galaxy may be emptier than your last Tinder date. According to a new study, any alien civilizations out there? Probably short-lived — and doomed to fail spectacularly ...