Levels of potentially dangerous cosmic radiation in Earth's atmosphere rose to a two-decade high in November after a rare ...

Solar flares and other activity can disrupt radio communications, power grids and navigation signals, according to NASA.

NASA has issued a warning after detecting a powerful X-class solar flare from the Sun, with the potential to cause ...

Scientists have captured an exceptionally rare, high-resolution view of an active region that produced two powerful X-class ...

"We know from historical observations that significantly bigger events are possible, and we need to be ready," said a ...

A sunspot, potentially generating multiple solar flares, may lead to auroras that could be visible as far south as Alabama.

Like a toddler right before naptime, TRAPPIST-1 is a small yet moody star. This little star, which sits in the constellation ...