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Einstein_and_Einstein_A.jpg (423 × 486像素,文件大小:332 KB,MIME类型:image/jpeg


摘要

描述
English: Located on the western limb of the Moon, Einstein and Einstein A craters (16.3oN, 271.3oE ) are only visible to Earth-based observers during certain lunar lighting and orientation conditions. Einstein A is younger than Einstein, as indicated by the fact that it lies squarely in the middle of the floor of Einstein. When viewed in topographic data, these two craters reveal much about the relative age and shape of an impact crater. To understand further, let's first take a look at Einstein. Einstein is a fairly large crater that spans 198 km across. A crater's size alone however cannot reveal much about age. Einstein's relative age can be determined by examining the frequency and distribution of impact craters overprinted on its rim and floor. Younger craters have had fewer impacts, which enables them to retain their original morphology. Einstein A reveals most of its original structure, including a raised rim and ejecta blanket, and is therefore a relatively young crater as compared to Einstein, whose original structure has been somewhat degraded over time by smaller impacts. The Einstein craters were named after famed physicist, philosopher, and scientist Albert Einstein (1879-1955).
日期
来源 https://flic.kr/p/823ZS4
作者 NASA/Goddard Space Flight Center

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
警告:
本图原来发表于Flickr,作者为NASA Goddard Photo and Video,网址为https://flickr.com/photos/24662369@N07/4606398747;经FlickreviewR于2017-08-03 20:45:27审查后,确认本图以cc-by-2.0释出,相容于维基共享资源。然而上述的授权条款与来源处不同,因而无法确定本页所提供的授权条款是否有效。

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