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The immense jet stream within Earth’s molten iron core spans about 420 km in width and runs at a temperature nearly as hot as the sun.
“We know more about the sun than Earth’s core,” said Chris Finlay, co-author of the study that was published Monday in Nature Geoscience. “The discovery of this jet is an exciting step in learning more about our planet’s inner workings”.
This is the first time the jet stream has been seen clearly, with the help of the European Space Agency’s Swarm mission, which features a trio of satellites that simultaneously measure and decipher magnetic signals coming from Earth.