One way to track the solar cycle is by counting the number of sunspots, which are dark, cooler patches on the Sun’s surface.

Here's how the astronomical phenomenon influences our planet—from the length of our seasons to the way Earth moves through ...

Massive solar flares, graceful eruptions of solar material, and an enormous sunspot make up some of the imagery captured by NASA's Solar Dynamics Observatory in 2013 and 2014. A year ago this weekend, ...

People in the U.S. were treated to stunning auroras last week when a powerful geomagnetic storm pushed the celestial displays as far south as Florida and Mexico. The spectacle was particularly ...

The sun has just unleashed its most powerful solar flare this cycle, a colossal X-class eruption. The X9.05 solar flare peaked at 8:10 a.m. EDT (1210 GMT), triggering shortwave radio blackouts over ...