The sun is the star at the center of our solar system. It's the largest, brightest and most massive object in the solar system, and it provides the light and heat that life on Earth depends on.

A 40-year study shows the Sun’s internal structure subtly shifts between quiet cycles, offering clues to future solar activity.

The sun’s outer atmosphere resembles a pufferfish. That’s what scientists have gleaned from the first verified maps of the shifting boundary between the sun and the rest of the solar system. “The ...