When a mysterious crescent appeared over Moscow in 1967, alien enthusiasts were unaware they were actually tracking a 3-megaton weapon designed to bypass American radar.

With the release, the American public could learn what, if anything, the government has documented about the unexplained ...

Debates over extraterrestrial life and unidentified flying objects have taken on a new political dimension in the United States.

If you've been following exoplanet research over the last couple of years, you've definitely heard of K2-18b. Located 124 ...

A dip in Earth's gravity field beneath Antarctica is helping scientists track deep-Earth changes over tens of millions of years.