This image provided by NASA shows the south polar cap of Mars as it appeared to the Mars Global Surveyor on April 17, 2000.
這張由美國太空總署提供的照片顯示出火星的南極冠,是探測衛星「火星全球探勘者號」於二○○○年四月十七日觀測到的景象。Aug 05, 2018

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Photo: AFP
照片:法新社

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