A blast wave swept across the face of the Sun on Wednesday, rippling outward from the site of a large solar flare. Blast waves that spread all the way across the Sun like this one did are rare, ...

A gigantic plasma wave that launched from the sun smashed into Mercury Tuesday (April 12), likely triggering a geomagnetic storm and scouring material from the planet's surface. The powerful ...

So why the heat wave in the U.S. East? This week Earth is farther from the sun than it will be at any other time in 2010. The sun, seen rising in Brazil Tuesday, was farther from Earth that day ...

The sun celebrated May Day with a spectacular solar eruption Wednesday, unleashing a colossal wave of super-hot plasma captured on camera by a NASA spacecraft. The solar eruption occurred over a 2 ...