A hundred billion stars mutually bound by gravity encircle the central region, some passing close in, some in wider orbits.
A hundred billion stars mutually bound by gravity encircle the central region, some passing close in, some in wider orbits.
一千亿恒星被引力相互联结着，束缚在中心区域，有些更靠近中心，有些（在外围）有着更宽阔的轨道。