The Milky Way is a barred spiral galaxy. It features a central bar-shaped core region surrounded by a disk of gas, dust, and stars with spiral arms extending from the ends of the bar. This type is classified as SBbc in the Hubble sequence, which means it has a moderately wound structure with a prominent bar. The galaxy contains about 100 billion stars and has a diameter of roughly 100,000 light-years. Our Solar System is located in one of the spiral arms called the Orion Arm, about 25,000 to 27,000 light-years from the galactic center. The Milky Way's central bulge has older stars, while the disk has many young, hot stars indicating ongoing star formation.