新月海王星和海卫一
(原标题: Crescent Neptune and Triton)
2023-05-27
浏览次数: 14
1989年，旅行者2号宇宙飞船穿过外太阳系，向太阳望去，发现了最遥远的行星海王星和它的卫星海卫一一起呈新月形的景象。这张优雅的冰巨行星和最大卫星的照片是在旅行者号最接近地球之后从背后拍摄的。这张照片不可能是从地球上拍摄的，因为对朝向太阳的眼睛来说，这颗最遥远的行星从来没有呈现出月牙形。在飞向日球层顶及更远的地方时，飞船的分离有利位置也剥夺了海王星熟悉的蓝色色调。
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Gliding through the outer Solar System, in 1989 the Voyager 2 spacecraft looked toward the Sun to find this view of most distant planet Neptune and its moon Triton together in a crescent phase. The elegant image of ice-giant planet and largest moon was taken from behind just after Voyager's closest approach. It could not have been taken from Earth because the most distant planet never shows a crescent phase to sunward eyes. Heading for the heliopause and beyond, the spacecraft's parting vantage point also robs Neptune of its familiar blue hue.