梅西耶陨石坑的立体影像 地球天空中许多明亮的星云和星团都与一位18世纪的天文学家查尔斯·梅西耶的名字密切相关，他正是著名的梅西耶天体表的作者。图中月球上的这两个举世瞩目的大型陨石坑正是以他的名字命名的。在黝黑肥沃且平滑的冷海中，梅西耶（左）与梅西耶A坑的面积分别为15乘8公里与16乘11公里。撞击物沿小角度的轨道从左向右移动擦撞月球表面，不仅将它们塑造成细长的形状，而且形成了两条明亮的物质射线，沿表面向右延伸至图片以外。这张动人心魄的陨石坑立体影像是对阿波罗11号探月任务中拍摄的两幅图像（AS11-42-6304与AS11-42-6305）进行高解析线扫描制作而成的，观赏时应佩戴红蓝眼镜（红色在左）。
译：银河说翻译组 俞天丽
Messier Craters in Stereo
Image Credit: Apollo 11, NASA; Stereo Image Copyright Patrick Vantuyne Explanation: Many bright nebulae and star clusters in planet Earth’s sky are associated with the name of astronomer Charles Messier, from his famous 18th century catalog. His name is also given to these two large and remarkable craters on the Moon. Standouts in the dark, smooth lunar Sea of Fertility or Mare Fecunditatis, Messier (left) and Messier A have dimensions of 15 by 8 and 16 by 11 kilometers respectively. Their elongated shapes are explained by a left-to-right moving, extremely shallow-angle trajectory followed by an impactor that gouged out the craters. The shallow impact also resulted in two bright rays of material extending along the surface to the right, beyond the picture. Intended to be viewed with red/blue glasses (red for the left eye), this striking stereo picture of the crater pair was recently created from high resolution scans of two images (AS11-42-6304, AS11-42-6305) taken during the Apollo 11 mission to the moon.
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