新视野号飞掠冥王星
Pluto Flyover from New Horizons

原始链接: https://apod.nasa.gov/apod/ap250518.html

2025年5月18日,NASA每日天文一图(APOD)发布了一段冥王星模拟飞越视频,该视频由新视野号探测器2015年飞掠冥王星时拍摄的图像制作而成。这段时长两分钟的延时视频经过色彩增强和垂直比例缩放处理,展现了这颗矮行星多样地形的壮丽景色。 视频从日出开始,展现了由水冰构成的山脉,这些山脉带有冻结的氮的色调。广阔平坦的氮冰海占据了大部分视野,其表面被分割成奇特的几何多边形,据信是由内部热量造成的。陨石坑和冰山点缀在景观之中。旅程最终飞越了“刀刃状”地形,其特征是高耸的冰脊之间隔着宽阔的裂隙。 新视野号探测器以大约每小时8万公里的速度飞行,它不会返回冥王星,目前正沿着一条飞出太阳系的轨道运行。这段视频为我们提供了一个独特的视角,去观察这颗曾经被认为是遥远冰冷球体的星球,如今,多亏了新视野号任务,我们得以以惊人的细节看到它的真实面貌。

Hacker News上的一篇帖子讨论了新视野号任务拍摄的冥王星飞越视频。评论者们指出了视频中使用的色彩增强和垂直缩放,对冥王星地貌的实际高度提出了质疑。一位用户指出,由于低重力和缺乏侵蚀,冥王星确实存在显著的山脉。其他人则称赞视频中使用的海拔高度图的真实性,赞赏其忠实于现有数据。一些人希望有更高质量的CGI和沉浸式体验,建议NASA开发一款VR“游戏”。冥王星的亮度也成为了讨论的话题,一位用户纠正了认为冥王星极其黑暗的假设,指出太阳在冥王星上的亮度与地球上阴天相当。总的来说,该帖子表达了对这次任务成就的惊叹,以及对未来探索和更逼真模拟的渴望。

原文
APOD: 2025 May 18 – Pluto Flyover from New Horizons

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2025 May 18

Pluto Flyover from New Horizons
Video Credit: NASA, JHUAPL, SwRI, P. Schenk & J. Blackwell (LPI); Music Open Sea Morning by Puddle of Infinity

Explanation: What if you could fly over Pluto -- what might you see? The New Horizons spacecraft did just this in 2015 July as it shot past the distant world at a speed of about 80,000 kilometers per hour. Images from this spectacular passage have been color enhanced, vertically scaled, and digitally combined into the featured two-minute time-lapse video. As your journey begins, light dawns on mountains thought to be composed of water ice but colored by frozen nitrogen. Soon, to your right, you see a flat sea of mostly solid nitrogen that has segmented into strange polygons that are thought to have bubbled up from a comparatively warm interior. Craters and ice mountains are common sights below. The video dims and ends over terrain dubbed bladed because it shows 500-meter high ridges separated by kilometer-sized gaps. The robotic New Horizons spacecraft has too much momentum to ever return to Pluto and is now headed out of our Solar System.

Tomorrow's picture: moon Charon
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