The aurora borealis was viewable across Wisconsin multiple nights this week — and not for the first time this year.

Sunspot AR3229 erupted with an X2-class solar flare. NASA's Solar Dynamics Observatory captured the fireworks in multiple ...

For two nights, dazzling auroras delighted sky-gazers in unexpected places, including in the US as far south as Florida. The ...

At the center of a galaxy 10 billion light-years away, a supermassive black hole is the new record holder for brightest flare ...

A series of coronal mass ejections are washing over the Earth, inducing a severe geomagnetic storm. The geomagnetic ...