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LiveScience
LiveScience
Harry Baker

Mysterious substance spotted swirling across the surface of the Baltic Sea — Earth from space

Earth the Baltic Sea Ocean Poland Gdańsk NASA
Large swirls of green seen on the ocean's surface from space.
QUICK FACTS

Where is it? Gulf of Gdańsk, Poland [54.49454424, 19.056185969]

What's in the photo? Slicks of organic material swirling on the ocean surface

Which satellite took the photo? European Space Agency’s Sentinel-2A satellite

When was it taken? May 16, 2018

This striking false-color satellite image shows masses of organic material swirling along the Polish coastline. When the photo was taken, the composition of these giant swirls was unknown, but surprising research has since revealed what they are made of.

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