暮光时分的地球

2024年12月27日

Planet Earth at Twilight
Image Credit: ISS Expedition 2 Crew, Gateway to Astronaut Photography of Earth, NASA

Explanation: No sudden, sharp boundary marks the passage of day into night in this gorgeous view of ocean and clouds over our fair planet Earth. Instead, the shadow line or terminator is diffuse and shows the gradual transition to darkness we experience as twilight. With the Sun illuminating the scene from the right, the cloud tops reflect gently reddened sunlight filtered through the dusty troposphere, the lowest layer of the planet’s nurturing atmosphere. A clear high altitude layer, visible along the dayside’s upper edge, scatters blue sunlight and fades into the blackness of space. This picture was taken from the International Space Station orbiting at an altitude of 211 nautical miles. Of course from home, you can check out the Earth Now.

Tomorrow’s picture: planet Earth at night

暮光时分的地球
影像提供: ISS Expedition 2 Crew, Gateway to Astronaut Photography of Earth, NASA

说明: 在这张呈现地球海洋和云彩的壮丽影像里，当白画变成黑夜时，并没有明显的边界分隔日夜。分隔画夜的明暗界线其实是一个弥漫的区域，于此暮曙光区里，白画与黑夜缓缓过渡。在这幅影像里，阳光从右方入射，当它们穿过烟尘弥漫、滋养地球万物的对流层时，会受到过滤逐渐变红，然后再从云层反射造成影像里的淡红色泽。于影像右上角的白画地球边缘，可以清楚看见平流层顶，以及受到散射的蓝光逐渐隐没在黝黑的太空中。这幅影像，则是摄于轨道高390公里（211海里）的国际空间站上。然而，如今端坐在家中的你，可上网观看地球的现况。

明日的图片: planet Earth at night