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The Operational Land Imager on the Landsat 8 satellite snapped the image on Aug. 11, according to NASA's Earth Observatory, when land-based observers reported massive blooms of cyanobacteria. These bacteria are also called blue-green algae, though they aren't actually algae at all; they're an ancient family of bacteria that get their energy from the sun, via photosynthesis. [Source: Discovery News]
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