He wasn't wrong—the sun is 99.8 percent of the mass of the solar system. But what is that giant ball of fire in the sky? How ...

It weighs 5.6 tons and has a footprint roughly the size of a small garage ... outstanding questions on solar physics.' The sun is the star at the heart of the Solar System, a nearly perfect ...

At such close proximity to its star, the planet is likely covered in magma boiling off into space. As the roasting planet ...

The core of a star reaches temperatures—energy levels, really—we don't see anywhere else outside fusion reactors. The visible surface layer of the Sun, called the photosphere, is a toasty ...

"This measurement of the planet population from planets somewhat larger than Earth all the way to the size of Jupiter and ...

The Sun is our nearest star. It is a relatively small star when compared to other stars in the universe. Our Solar System contains the Sun and everything that orbits it. The life cycle of a star ...