Astronomy Picture of the Day——真彩色冥王星照片​

Pluto in True Color 
Image Credit: NASA, JHU APL, SwRI, Alex Parker

Explanation: What color is Pluto, really? It took some effort to figure out. Even given all of the images sent back to Earth when the robotic New Horizons spacecraft sped past Plutoin 2015, processing these multi-spectral frames to approximate what the human eye would see was challenging. The result featured here, released three years after the raw data was acquired by New Horizons, is the highest resolution true color image of Pluto ever taken. Visible in the image is the light-colored, heart-shaped, Tombaugh Regio, with the unexpectedly smooth Sputnik Planitia, made of frozen nitrogen, filling its western lobe. New Horizons found the dwarf-planet to have a surprisingly complex surface composed of many regions having perceptibly different hues. In total, though, Pluto is mostly brown, with much of its muted color originating from small amounts of surface methane energized by ultraviolet light from the Sun.

真彩色冥王星照片

遥远的冥王星究竟是什么颜色呢？这得花费些功夫才能搞清楚。即使参考2015年新视野号飞越冥王星时传回的图像，单单处理多光谱影像成为接近人眼所看到的色彩就是一项艰难的挑战。这幅特征图像是于2018年发布的，距离新视野号获得原始数据已经三年，是迄今为止拍摄的冥王星最高分辨率真彩色影像。影像中的浅色心形区域是汤博区，由冰氮构成，异常平滑的斯普特尼克平原占据了它的西叶。新视野号发现这颗矮行星由许多具有明显不同色调的区域所组成的复杂表面。不过，总体来说，冥王星大部分是棕色的，其大半黯淡的颜色则来自于太阳紫外线激发的少量表面甲烷。

高清原图地址：

https://apod.nasa.gov/apod/image/1909/PlutoTrueColor_NewHorizons_8000.jpg

近期文章：

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