X2.7-class eruption from sunspot AR4087 disrupts radio signals as the active region rotates toward Earth, raising the risk of more flares ahead.

A reappraisal of decades-old data suggests that strange circular formations on Venus could be volcanic “rings of fire” ...

A serendipitous solar outburst let scientists point the robot’s cameras toward the Red Planet’s sky to spot a feature shared with our Blue Marble.