月球上的空间站剪影
影像来源与版权:Eric Holland

说明:月球上那奇特的黑点是什么?那是国际空间站。上个月这个围绕地球轨道运行的空间站在精确的时间内穿过了部分被照亮的月球前方。影像摄于美国加州帕洛阿尔托,曝光时间只有1/667秒。相比之下,国际空间站穿越整个月球需要半秒钟。通过仔细观察国际空间站异常纤细的剪影可以辨识出数量众多的太阳能电池板和桁架的轮廓。明亮的第谷环形山在左下角清晰可见,另外还可以看到颜色较浅相对粗糙的月球高地,以及相对平滑颜色较深的月海。线上的工具软件可以告诉你,你所在的区域何时能看到国际空间站。
翻译:北京天文馆

Space Station Silhouette on the Moon
Image Credit & Copyright: Eric Holland

Explanation: What’s that unusual spot on the Moon? It’s the International Space Station. Using precise timing, the Earth-orbiting space platform was photographed in front of a partially lit gibbous Moon last month. The featured image was taken from Palo Alto, California, USA with an exposure time of only 1/667 of a second. In contrast, the duration of the transit of the ISS across the entire Moon was about half a second. A close inspection of this unusually crisp ISS silhouette will reveal the outlines of numerous solar panels and trusses. The bright crater Tycho is visible on the lower left, as well as comparatively rough, light colored terrain known as highlands, and relatively smooth, dark colored areas known as maria. On-line tools can tell you when the International Space Station will be visible from your area.
Astronomy Picture of the Day 04/02/2019