Astronomy Picture of the Day——月面撞击
Moon Struck
Image Credit & Copyright: Petr Horálek
Explanation: Craters produced by ancientimpacts on the airless Moon have long been a familiar sight. But only since the1990s have observers began to regularly record and study optical flashes on thelunar surface, likely explosions resulting from impacting meteoroids. Ofcourse, the flashes are difficult to see against a bright, sunlit lunarsurface. But during the January 21 total eclipse many imagers serendipitously captureda meteoroid impact flash against the dim red Moon. Found while examining imagestaken shortly before the total eclipse phase began, the flash is indicated inthe inset above, near the Moon's darkened western limb. Estimates based on theflash duration recorded by the Moon Impact Detection and Analysis System(MIDAS) telescopes in southern Spain indicate the impactor's mass was about 10kilograms and created a crater between seven and ten meters in diameter.
月面撞击
缺少大气的月球表面，远古撞击所形成的环形山一直是人们对它熟悉的印象。但直到20世纪90年代，才有观测者开始有规律地记录和研究月球表面的亮闪，这可能是被流星体撞击所产生的爆炸。当然，在被阳光照射的明亮月球表面很难看到闪光。然而，在1月21月全食期间，经仔细检查照片，许多都意外地捕捉到了一颗流星体撞击黯淡红月所发出的闪光。以上这幅图像中的闪光发现于月全食阶段开始前不久，它位于月球变暗的西部边缘附近。根据西班牙南部的月球撞击探测和分析系统（MIDAS）望远镜所记录的闪光持续时间来估计，撞击物的质量约为10千克，形成了一个直径7到10米的撞击坑。
参考文献：
https://apod.nasa.gov/apod/image/1901/2019_01_21_ZM_Single_crop.jpg
近期文章：
Astronomy Picture of the Day——船尾座RS星