A giant dent in Earth's magnetic field is continuing to expand, according to the latest data from a trio of satellites monitoring our world.

It's called the South Atlantic Anomaly, stretching across the gulf that separates Africa from South America, and the latest data suggests that it has expanded by roughly half the size of continental Europe since 2014, while its magnetic intensity weakens.

The measurements indicate that the ocean of molten iron in Earth's outer core, which generates the planetary magnetic field, isn't steady and calm but churning and complex, with behavior that can change the external field on timescales as short as years.

Related: NASA Is Watching a Vast, Growing Anomaly in Earth's Magnetic Field

Earth's magnetic field is a vast web of magnetic field lines gene

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