The sun is slowly expanding. In about 5 billion years, the sun will enter the red giant phase. During this phase, the sun makes a transition from burning hydrogen in the core to burning hydrogen ...

can be linked to the dynamo mechanism operating inside the sun," co-author Zsolt Kővári explained in a statement. "The large-amplitude variations in the brightness of the red giant XX Tri have ...

Stars like our sun fuse hydrogen in their cores into helium ... At this stage, the star becomes a large red giant. Because a red giant is so large, its heat spreads out and the surface ...

Two giant holes appeared on the sun's surface. They're called coronal holes, and they'll send solar winds toward Earth, revealing stunning northern lights. More from News Two giant holes appeared ...