Solar flares – they're big and they're fast. They can knock out a satellite or create a beautiful aurora. And the jury is still out on what causes these explosions.

A new analysis of the unusually long solar cycle that ended in 2008 suggests that one reason for the long cycle could be a stretching of the Sun’s conveyor belt, a current of plasma that circulates between the Sun’s equator and its poles.

Mars rover team members have begun informally naming features around the rim of Endeavour Crater, as they develop plans to investigate that destination when NASA's Opportunity rover arrives there after many more months of driving.

The Sun's influence on the climate has often been debated. But a new study from NASA shows that Solar activity can not account for the observed changes