Earth's core has baffled researchers for decades, and it still contains many secrets. AdvertisementAdvertisementA diagram shows the Earth's magnetic field deflecting waves of energy coming from the sun. The strength of Earth's magnetic field in 2020, as measured by the European Space Agency's SWARM satellites. The Earth's inner core may be spinning and might sometimes flip backwardThe core itself is not uniform. A graphic showing how iron crystals may be distributed and moved around the Earth's inner core.

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Persons: Andrew Z, Colvin, Lutz Rastaetter, Christopher C, Finlay, al, Edward Garnero, Li, Lindsey Kenyon, Samantha Hansen, Insider's Morgan McFall, Johnsen, Chris Panella, John Vidale, UC Berkeley seismologist Daniel Frost, LiveScience Organizations: Service, NASA, Modeling, NASA Goddard Space, Wikimedia, German Research Center, Geosciences, European Space Agency, Arizona State University, Lindsey, University of Alabama, University of Southern, Washington Post, UC Berkeley Locations: South America, Antarctica, University of Southern California, Banda