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| An Accelerating 'Jetstream Like' River of Molten Iron Has Been Discovered Under Alaska and Siberia
Almost as hot as the surface of the Sun. A fast-flowing river of molten iron has been found surging under Alaska and Siberia, some 3,000 km (1,864 miles) below the surface - and it appears to be speeding up. This colossal jet stream, which is estimated to be about 420 km wide (260 miles) and nearly as hot as the surface of the Sun, has tripled in speed in less than two decades, and is now headed towards Europe. "We know more about the Sun than Earth's core," says one of the team, Chris Finlay from the Technical University of Denmark. "The discovery of this jet is an exciting step in learning more about our planet's inner workings." Finlay and his team detected the jet stream while analysing data from the European Space Agency's (ESA) trio of satellites, called Swarm. Launched in 2013 to measure fluctuations in Earth's magnetic field, these satellites allowed the researchers to create a kind of x-ray of the planet's inner structure, revealing vast components that we didn't even know