outermost orbit

基本解释

New Horizons' trailblazing journey to the solar system's outermost frontier took it past the orbit of Mars today at 6 a. m. EDT , 78 days after the spacecraft launched.
新地平線打響了探索太陽系邊疆的第一砲，而在今天美國東部時間早上6點，在發射了78天後它成功跨越了火星軌道。
Its event horizon--theboundary at which nothing, not even light, can escape the monster’s gravitationalpull--is four times as large as the orbit of Neptune,our sun’s outermost planetary satellite.
在它的事件眡界，即其邊界，沒有任何東西可以逃脫這頭巨獸的引力，甚至連光也不行。其引力相儅於位於我們太陽系最外層行星軌道的海王星的四倍。