The Earth loses a few tens of millions of years

The planet Earth is a little younger than previously thought according to a new study. Radiological analysis concentrated on 182 hafnium, which decays into 182 tungsten, which in turn heads towards the core if possible, leaving a signature related to how long it took the Earth to ‘differentiate’, or allow the heavy stuff to settle in the core and the light stuff rise. The result was compared to abundances found in meteorites and also to the results of another similar analysis using different isotopes. In order for the results of both analyses to agree, the rubble that formed the Earth would have done so rapidly, then stopped for a while, and then continued on with the job at a more steady rate. The hiatus in accretion is believed to have been the impact that formed the Moon.

This new idea of how the planet formed would see the world coming together over 100 million years rather than 30 million, making the resultant planet 70 million years younger than previously assumed, although at 4.467 billion years, the Earth is still by no means a spring chicken…

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