The Baltic Sea connects nine nations and centuries of history. Learn how its unique geography and geological past shaped ...

The Northern Lights may be visible in the U.S. this Monday, following a geomagnetic storm forecast by space weather experts ...

The northern lights provided a rare sight for residents across the U.S. and around the world Friday night, with a powerful solar storm fueling a spectacle seen as far south as the Florida Keys. Strong ...

NATIONAL HARBOR, Md. — The most pressing threat to Northern European nations is Russia’s and China’s gray zone threats on undersea lines of communication, senior NATO navy leaders said Monday. The ...