The Harvard astrophysicist has devoted years—and thousands of interviews—to the idea that mysterious objects streaking ...

Somewhere out there, a planet roughly the size of Earth may be orbiting a distant star in conditions that could support life.

Claims of an 'arms race' involving Russia and China, reverse-engineering, and crashed alien spacecraft re-emerged this month ...

A lobbying campaign by tech and AI industries has led the Trump administration to reverse a new green card policy, allowing exemptions for those providing economic benefits or serving national ...