NASA | SDO: Year 4

Our Sun is a normal main-sequence G2 star, one of more than 100 billion stars in our galaxy. It formed about 4.6 billions years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The Sun is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the Solar System (Jupiter contains most of the rest). It is often said that the Sun is an “ordinary” star. Chemically, about three quarters of the Sun’s mass consists of hydrogen, while the rest is mostly helium. The Sun is personified in many mythologies: the Greeks called it Helios and the Romans called it Sol. (Wiki) (Nineplanets). The Solar Dynamics Observatory (SDO) is a NASA mission which has been observing the Sun for the last five years with a 24-hour eye on the entire disk of the sun. Have a look at YEAR 4 above!