The Sun has reached the most active stretch of its natural cycle, and the most visible consequence for people on the ground has been the northern lights showing up in places that almost never see them ...

Skywatchers across the northern United States and parts of Europe have had far more chances to see the aurora over the past two years than during a typical decade, and the reason traces back to where ...

On Wednesday, a total solar eclipse will plunge a swath of Greenland, Iceland and Spain into a sudden midafternoon darkness. A deep twilight azure will descend over the landscape. Venus will shine as ...