The sun contains over 99% of the mass of our entire solar system. Like Earth, the sun also rotates on its axis. Each rotation takes about 27 Earth days.

The sun's north and south poles do a flip about every decade, but scientists don't know why. NASA and ESA's Solar Orbiter hopes to answer that question.

Watch the sun unleash 600,000-mile-long eruption in fiery outburst (video) Humanity takes its 1st look at the sun's poles: 'This is just the first step of Solar Orbiter's stairway to heaven' (images) ...

The European Space Agency’s (ESA’s) Solar Orbiter is out of alignment with the rest of the Solar System. And that’s a good thing. By orbiting the Sun outside of the Solar System’s orbital plane, the ...

If our species manages to hang on for a few billion additional years, we might be in for a wild ride — stars passing in the vicinity of the sun could cause planets in our solar system to collide ...

"This system is one of the best that we know to actually probe some of the processes that happened in our Solar System," van 't Hoff said in a news release. HOPS-315 is much younger than the Sun ...

The sun is unique in that it's the only star in our solar system. Up to 85% of stars have at least one companion star. The sun contains over 99% of the mass of our entire solar system.