明暗交界区集成的月亮

2022年2月15日

Terminator Moon
Image Credit: NASA, Lunar Reconnaissance Orbiter, SVS; Processing & Copyright: Jai & Neil Shet

Explanation: What’s different about this Moon? It’s the terminators. In the featured image, you can’t directly see any terminator — the line that divides the light of day from the dark of night. That’s because the image is a digital composite of 29 near-terminator lunar strips. Terminator regions show the longest and most prominent shadows — shadows which, by their contrast and length, allow a flat photograph to appear three-dimensional. The original images and data were taken near the Moon by NASA’s Lunar Reconnaissance Orbiter. Many of the Moon’s craters stand out because of the shadows they all cast to the right. The image shows in graphic detail that the darker regions known as maria are not just darker than the rest of the Moon — they are flatter.

Dial-A-Moon: Find the phase of the Moon on your birthday.

Tomorrow’s picture: eroding sun tower

明暗交界区集成的月亮
影像提供: NASA, Lunar Reconnaissance Orbiter, SVS; 影像处理与版权: Jai & Neil Shet

说明: 这轮月亮有何不同呢？它是由许多明暗交界区集结而成。不过在这幅主题影像里，你却见不到任何分隔白画与黑夜的明暗交界线。这是因为这幅影像，是由撷取自月面明暗交界线附近的29个长条拼接而成。这些明暗交界线区的暗影最长也最明显，而这些对比鲜明的暗影及其长度，让平面照片变得很立体。用以组成这幅影像的原始照片和数据，是由NASA布署在月亮附近的月球勘测轨道飞行器所拍摄。这些数量众多的月表撞击坑（环型山）之所以会很突出，则是因为它们投射的影子都落在右侧。这幅影像很清晰生动的指证，较黝黑名为月海的区域，不但较其他月面黑也较平滑。

Dial-A-Moon: 你生日那天的月相

明日的图片: eroding sun tower