2020年8月29日

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Martian Chiaroscuro
Image Credit:
HiRISE, MRO, LPL (U. Arizona), NASA

Explanation: Deep shadows create dramatic contrasts between light and dark in this high-resolution close-up of the martian surface. Recorded on January 24, 2014 by the HiRISE camera on board the Mars Reconnaissance Orbiter, the scene spans about 1.5 kilometers. From 250 kilometers above the Red Planet the camera is looking down at a sand dune field in a southern highlands crater. Captured when the Sun was about 5 degrees above the local horizon, only the dune crests were caught in full sunlight. A long, cold winter was coming to the southern hemisphere and bright ridges of seasonal frost line the martian dunes. The Mars Reconnaissance Orbiter, one of the oldest operating spacecraft at the Red Planet, celebrated the 15th anniversary of its launch from planet Earth on August 12.

Tomorrow’s picture: cathedral to the stars


火星的明暗对照图
影像提供:
HiRISE, MRO, LPL (U. Arizona), NASA

说明: 深邃的阴影,造就了这幅火星表面 高解析特写影像里的强烈明暗反差。这幅在2014年1月24日,由飞在火星上方250公里高轨道上的火星探勘号轨道船. HiRISE相机拍摄的景观,涵盖南方高原撞击坑内的沙丘原约1.5公里之区域。拍照时,太阳在当地地平面上空5度的位置,所以只有丘顶还沐浴在灿烂的阳光里。随着长而酷寒的冬季降临到火星南半球,火星的沙丘出现了季节性的明亮霜脊。目前是火星最资深太空船之一的火星探勘号轨道船,在8月12日欢度探勘火星第十五周年。

明日的图片: cathedral to the stars

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