Jordan Flowers claims Russia and China may be reverse-engineering alien technology, raising national security concerns.

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

When we think of planet killer asteroids, survival odds might seem slim. But we aren't defenseless.

The justices allowed Fed governor Lisa Cook to stay in her job while she fights the Republican president's effort to fire her over allegations of mortgage fraud, which she has denied ...