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.
在它的事件视界，即其边界，没有任何东西可以逃脱这头巨兽的引力，甚至连光也不行。 其引力相当于位于我们太阳系最外层行星轨道的海王星的四倍。
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.
新地平线打响了探索太阳系边疆的第一炮，而在今天美国东部时间早上6点，在发射了78天后它成功跨越了火星轨道。
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