Barred spiral galaxy 13.6 billion years old, 100,000 light-years across. Contains about 200 billion stars and 1.5 trillion solar masses. Sun orbits center at 26,000 light-years, completing revolution in 230 million years
Eight planets exist in our solar system, with Pluto being classified as dwarf planet. A hypothetical ninth planet was proposed in 2016 but remains unconfirmed