行星地球
(原标题: Interplanetary Earth)
2024-11-23
浏览次数: 14
2013年7月19日，在太阳系的另外两个世界——最内层的水星和带环的气态巨行星土星——同一天拍摄到了地球的照片，这是第一次行星际照片。在左边的照片中，地球是土星环下方的一个淡蓝色点，这是卡西尼号宇宙飞船在绕着最外层的气体巨行星运行时拍摄到的。就在同一天，地球上的人们拍下了许多他们自己的土星照片。在右边，地月系统是在黑暗的太空背景下看到的，这是由向阳的信使号宇宙飞船拍摄的，然后在水星轨道上。信使号拍摄这张照片是为了寻找水星的小型天然卫星，这些卫星本来应该很暗。在信使号拍摄的照片中，较亮的地球和月球都过度曝光，在反射的阳光下发出明亮的光芒。卡西尼号和信使号注定不会返回它们的母星，因此它们已经退出了太阳系探测任务。
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In an interplanetary first, on July 19, 2013 Earth was photographed on the same day from two other worlds of the Solar System, innermost planet Mercury and ringed gas giant Saturn. Pictured on the left, Earth is the pale blue dot just below the rings of Saturn, as captured by the robotic Cassini spacecraft then orbiting the outermost gas giant. On that same day people across planet Earth snapped many of their own pictures of Saturn. On the right, the Earth-Moon system is seen against the dark background of space as captured by the sunward MESSENGER spacecraft, then in Mercury orbit. MESSENGER took its image as part of a search for small natural satellites of Mercury, moons that would be expected to be quite dim. In the MESSENGER image, the brighter Earth and Moon are both overexposed and shine brightly with reflected sunlight. Destined not to return to their home world, both Cassini and MESSENGER have since retired from their missions of Solar System exploration.