The Sun is a yellow dwarf star, a hot ball of glowing gases at the heart of our Solar System. The Sun's gravity holds the Solar System together, keeping everything in its orbit. The connection and interactions between the Sun and Earth drive the seasons, ocean currents, weather, climate, radiation belts and auroras. With a radius of 695,508 kilometers, our Sun is not an especially large star (many are several times bigger) but it is still far more massive than Earth. 1.3 million Earths would fit inside the Sun's volume. The Sun, and everything that orbits it, is located in the Milky Way galaxy. The Sun orbits the center of the Milky Way galaxy, bringing the planets, asteroids, comets and other objects along with it. It rotates as it orbits the center of the Milky Way.