Interesting research about the earth's core.
The inner core of the Earth is simultaneously melting and freezing due to circulation of heat in the overlying rocky mantle.
The research is published in the magazine Nature, could help us understand how the inner core formed and how the outer core acts as a 'geodynamo', which generates the planet's magnetic field.
The earth's magnetic field - and how it works - is of interest to UFO researchers the world over.
More: Nature
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