 The Sun. The heart of our solar system is a yellow dwarf star, a hot ball of glowing gases. Its gravity holds the solar system together. Electric currents in the Sun generate a magnetic field that is carried out through the solar system by the solar wind, a stream of electrically charged gas blowing outward from the Sun in all directions. The connections and interactions between the Sun and Earth drive space weather conditions on our planet, which can affect satellites and power grids, change the radiation belts and trigger the aurora. And never before have we been able to study it so closely. NASA's Parker Solar Probe is diving into the Sun's atmosphere, facing brutal heat and radiation on a mission to touch the Sun. And this spacecraft is changing the way we see and understand our nearest star. Today, NASA will reveal the surprising discoveries that this unprecedented spacecraft is uncovering about our Sun.