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 ...

Across deserts, jungles, and polar ice, new discoveries are quietly stretching the story of civilization further back in time than many of us learned in school. As archaeologists debate mysterious ...

The Silurian Hypothesis explores a strange question: if an advanced civilization existed millions of years before humans, ...

Sohrab Rahvar and Shahin Rouhani’s recent paper, “Constraining the Lifespan of Intelligent Technological Civilization in the Galaxy,” lays it out bluntly: Advanced civilizations last roughly 5,000 ...