Could Earth have hosted an advanced civilization before humans? This intriguing question is at the heart of the Silurian ...

The iconic Pyramids of Giza are already one of the world's greatest enigmas. Last month the mystery deepened when a team of Italian scientists said they found a vast city stretching thousands of feet ...

A new study argues that conditions necessary for intelligent extraterrestrial life may be far less common than once thought. Planets lacking plate tectonics and sufficient carbon dioxide and oxygen ...

What if — stick with us here — an unknown technological civilization is hiding right here on Earth, sheltering in bases deep underground and possibly even emerging with UFOs or disguised as everyday ...

The Search for Extraterrestrial Intelligence (SETI) is regularly plagued by the fact that humanity has a very limited perspective on civilization and the nature of intelligence itself. When it comes ...