夜晚的海王星
(原标题: Neptune at Night)
2024-11-09
浏览次数: 22
冰巨海王星在地球的夜空中是微弱的。它离太阳的距离是我们美丽星球的30倍，要想瞥见这个昏暗而遥远的世界，就需要望远镜。然而，对于地球附近的望远镜来说，这种戏剧性的海王星之夜的景象是不可能的。从太阳系内部向外看，它们只能看到海王星白天的一面。事实上，这张海王星细长的新月与它的大卫星海卫一的新月相邻的夜侧照片是由旅行者2号拍摄的。旅行者2号宇宙飞船于1977年从地球发射升空，于1989年近距离飞越太阳系最外层的行星海王星，在这个机器人宇宙飞船继续其星际空间之旅的同时，在夜晚回望海王星。
查看原文解释
Ice giant Neptune is faint in Earth's night sky. Some 30 times farther from the Sun than our fair planet, telescopes are needed to catch a glimpse of the dim and distant world. This dramatic view of Neptune's night just isn't possible for telescopes in the vicinity of planet Earth though. Peering out from the inner Solar System they can only bring Neptune's day side into view. In fact this night side image with Neptune's slender crescent next to the crescent of its large moon Triton was captured by Voyager 2. Launched from planet Earth in 1977 the Voyager 2 spacecraft made a close fly by of the Solar System's outermost planet in 1989, looking back on Neptune at night as the robotic spacecraft continued its voyage to interstellar space.
© Voyager