スミソニアン博物館のインスタグラム(smithsonian) - 1月9日 23時30分

In celebration of the 10th anniversary of @NASA Mars Rover mission, @airandspacemuseum has opened an exhibition on rover-captured photographs from the Red Planet. Pictured: These loose, BB-sized, hematite-rich spherules are embedded in this Martian rock like blueberries in a muffin and released over time by erosion. The Mars Rover Opportunity found this cluster of them at its Eagle Crater landing site and analyzed their composition with its spectrometers. Hypotheses about their formation have contributed to the story of water on Mars. See this photo and others in the “Spirit & Opportunity: 10 Years Roving Across Mars” on view through Sept. 14, 2014

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