土星环外的卫星
(原标题: Moons Beyond Rings at Saturn)
2022-01-04
浏览次数: 14
土星的卫星发生了什么？什么也没有——土星的卫星土卫五只是部分隐藏在土星环后面。2010年，绕土星运行的卡西尼号宇宙飞船拍摄了这张窄角度照片，横跨太阳系最著名的土星环。前景中可见的环包括外部的薄F环和内部更宽的A环和B环。虽然它看起来在土星环上方盘旋，但土星的卫星Janus实际上在它们后面很远的地方。Janus是土星较小的卫星之一，直径只有180公里。离相机更远的地方是布满陨石坑的土卫五，这是一颗直径1500公里的大得多的卫星。土卫五的顶部只能通过光环的缝隙看到。经过十多年的探索和发现，卡西尼号航天器在2017年耗尽了燃料，并被指示进入土星的大气层，在那里它肯定融化了。探索你的宇宙：随机APOD生成器
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What's happened to that moon of Saturn? Nothing -- Saturn's moon Rhea is just partly hidden behind Saturn's rings. In 2010, the robotic Cassini spacecraft then orbiting Saturn took this narrow-angle view looking across the Solar System's most famous rings. Rings visible in the foreground include the thin F ring on the outside and the much wider A and B rings just interior to it. Although it seems to be hovering over the rings, Saturn's moon Janus is actually far behind them. Janus is one of Saturn's smaller moons and measures only about 180 kilometers across. Farther out from the camera is the heavily cratered Rhea, a much larger moon measuring 1,500 kilometers across. The top of Rhea is visible only through gaps in the rings. After more than a decade of exploration and discovery, the Cassini spacecraft ran low on fuel in 2017 and was directed to enter Saturn's atmosphere, where it surely melted. Explore Your Universe: Random APOD Generator