Evolution

It turns out the core of the Earth is closer to about 6000 degrees Celsius, about 1000 degrees hotter than previously estimated. This is good, because the difference between the core and the mantle needs to be at least 1500 degrees to create a magnetic field. To read more about the new estimate and why the old estimate was wrong, go to:

http://www.sciencedaily.com/releases/2013/04/130425142355.htm