NASA’s Mars Exploration Rover Spirit captured this stunning view as the Sun sank below the rim of Gusev crater on Mars 20 years ago. In this image, the bluish glow in the sky above the Sun would be visible to us if we were there, but an artifact of the panoramic camera’s infrared imaging capabilities is that with this filter combination, the redness of the sky farther from the sunset is exaggerated compared to the daytime colors of the Martian sky.
Image credit: NASA/JPL-Caltech/Texas A&M/Cornell
NASA的勇气号火星探测车在20年前拍下了这幅令人惊叹的画面：夕阳缓缓沉入古谢夫撞击坑（Gusev Crater）边缘之下。图中，太阳上方天空中泛着的蓝色微光若我们身处其境也能亲眼所见。不过，由于全景相机使用了红外成像技术，该滤镜组合会夸大远离落日方向天空的红色，使其比火星白天的天空颜色更显浓烈。
图片来源: NASA/JPL-Caltech/Texas A&M/Cornell
