Old Galactic stellar populations

Over its history, the Milky Way has accreted several smaller satellite galaxies. These mergers added stars and gas to the Galaxy and affected the properties of the pre-existing...纵观其演化历史，银河系(Milky Way)已吸积多颗小型卫星星系(satellite galaxies)。这些星系并合过程为银河系增添了恒星与气体，并改变了其预先存在的天体性质……