The solidification of the inner core may have strengthened Earth's magnetic field.
Earth's core is a billion years old : Read more
Earth's core is a billion years old : Read more
No, the article isn't saying that at all.Interesting report indicating the *Earth's present core* must be very young compared to the age of the solar system.
I understood the same.It's the inner, solid core that may be that young - and the 2015 and this paper together makes a good case for such a thermally simple model - but the initial liquid core is, according to radioisotope models about 80 Myrs (IIRC). The iron-nickel liquid droplet trickled down with or without the Moon forming impact at about 50 Myrs helping - since even a small body as the Moon has a similar core - and apart from the inner solid core they now remain as the liquid outer core which makes up the geodynamo engine.