声明：
本文中的图片和英文原文均来自NASA，由导航狗对原文进行翻译，译文仅供参考。
原文链接：https://www.nasa.gov/image-feature/jpl/ice-block-avalanche
原文标题：Ice Block Avalanche
Manifesto:
The picture in this article and the English original text are all from NASA, DaoHangGou translated the original text and translated for reference only.
Original link: https://www.nasa.gov/image-feature/jpl/ice-block-avalanche
Original title: Ice Block Avalanche
One of the most actively changing areas on Mars are the steep edges of the North Polar layered deposits. This image from NASA’s Mars Reconnaissance Orbiter (MRO) shows many new ice blocks compared to an earlier image in December 2006. An animation shows one example, where a section of ice cliff collapsed. The older image (acquired in bin-2 mode) is not as sharp as the newer one.
火星上变化最活跃的区域是北极层状沉积物的陡峭边缘地带．与之前拍摄于2006年12月的图片相比，这张来自NASA火星侦测轨道飞行器(MRO)的图片显示了更多新的冰块．模拟动画对此提供了一个示例，一个片状的冰块悬崖倒塌了，之前的图像（在二进制模式下获得的）不像较新的图片那样锐利．
HiRISE has been re-imaging regions first photographed in 2006 through 2007, six Mars years ago. This long baseline allows us to see large, rare changes as well as many smaller changes.
在6个火星年之前，即地球年的2006年至2007年这段时间，HiRISE已经对该区域进行了重新成像．这个长基准线允许我们观察到大的和罕见的变化以及许多微小的变化．
The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. NASA’s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA’s Science Mission Directorate, Washington.
亚利桑那大学图森分校负责操作HiRISE, HiRISE由Ball航天科技公司建造，该公司位于美国科罗拉多州Boulder市．NASA喷气推进实验室位于美国加州Pasadena市的 加利福尼亚理工学院的一个分部管理着位于华盛顿的美国宇航局科学任务局的火星侦测轨道飞行器项目．
Image credit: NASA/JPL-Caltech/Univ. of Arizona
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Last Updated: July 7, 2018
Editor: Tony Greicius