galactic cloud造句

• Proto-galactic cloud
  原星系云
• If stars are born in the gas before the galactic cloud becomes rotationally supported, the stars will maintain their individual orbits around the galactic center, creating an elliptical galaxy
  如果恒星在气体中的诞生比星系云变为旋转性支撑早，那麽恒星将会各自保持其绕转星系中心的轨道，因而形成椭圆星系。