More states in the northern U.S. will have a chance of seeing aurora borealis on Friday, as high-speed winds from a spot on ...

Spring - brought on by the March equinox - is only a few weeks away. You can also count down the days to spring in real time.

The coldest burst of Arctic air this season is coming to put an icy exclamation point on America's winter of repeated polar ...

Every few hundred thousand years, Earth’s magnetic poles flip, turning north into south and south into north. These ...

China has begun recruiting for a planetary defense force after risk assessments determined that an asteroid could conceivably ...