A false-color satellite image of mysterious blobs on the ocean’s surface in Gdansk Bay in Poland captured by the European Space Agency’s Sentinel-2A satellite on May 16, 2018. (Image credit: ESA/NASA Earth Observatory)

Scientists have finally identified the surprising origin of the strange oceanic blobs that seem to circle the surface of the Baltic Sea: tree pollen.

Mystery spots are more visible in a corrected color satellite image (opens in a new tab) captured off the coast of Gdansk in Poland on May 16, 2018, but have turned up several times on satellite images in recent years.

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