Experts say cleaner air, melting Arctic ice and subtle changes in cloud formation are behind the shift. View on euronews ...

Residents of several northern U.S. states could have the opportunity to see the dazzling northern lights tonight. Here's what ...

Another geomagnetic storm will expand visibility of the aurora borealis. Here's how the celestial phenomenon works and where ...

Here's what happens as the direct rays of the sun slip south of the equator as the seasons change.

In a precursor to what we might expect in the coming flu season in the United States and across the Northern Hemisphere, a ...