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Data acquired July 20, 2025 720 x 700 JPEG
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An explosion in the numbers of cyanobacteria transformed the Baltic Sea into a swirling canvas of green in summer 2025.
NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen.
Published July 22, 2025 Data acquired July 20, 2025