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Earth's iron
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Research proposes new theories about nature of Earth's iron

New research challenges the prevailing theory that the unique nature of Earth's iron was the result of how its core was formed billions of years ago.
The study opens the door to competing theories about why levels of certain heavy forms of iron, known as isotopes, are higher on Earth than in other bodies in the solar system. The prevailing view attributes the Earth's anomalous iron composition to the formation of the planet's core. But the study published Feb. 20 in Nature Communications suggests that the peculiar iron's isotopic signature developed later in Earth's history, possibly created by a collision between Earth and another planetary body that vaporized the lighter iron isotopes, or the churning of Earth's mantle, drawing a disproportionate amount of heavy iron isotopes to Earth's crust from its mantle.

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RE: Earth's outer core
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Satellites help discover a jet stream in the Earth's core

A jet stream within the Earth's molten iron core has been discovered by scientists using the latest satellite data that helps create an 'x-ray' view of the planet.
Lead researcher Dr Phil Livermore, from the University of Leeds, said: "The European Space Agency's Swarm satellites are providing our sharpest x-ray image yet of the core. We've not only seen this jet stream clearly for the first time, but we understand why it's there."

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Iron 'jet stream' detected in Earth's outer core

Scientists say they have identified a remarkable new feature in Earth's molten outer core. They describe it as a kind of "jet stream" - a fast-flowing river of liquid iron that is surging westwards under Alaska and Siberia.
The moving mass of metal has been inferred from measurements made by Europe's Swarm satellites.

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