outermost
adjective [ before noun ] uk/ˈaʊ.tə.məʊst/ us/ˈaʊ.t̬ɚ.moʊst/
最外层的;（距中心）最远的
at the greatest distance from the centre
These spacecraft may send back data about the outermost reaches of the solar system. 这些宇宙飞船可能会发回关于太阳系最外层区域的数据。