Earth core movement hypothesis

 Yung and Song of Peking University, has recently studied the Earth core and concluded that ,the Earth core recently stopped and will change direction of rotation. 

 Such changes occur periodically evey 60 to 70 years .The reasoon mentioned by them is Earth's electromagnetic field and Gravitation pull. 

Now watch ,here ,the solid core of three fourth size of Moon ,3000 kms below our feet can be affected by gravitational pull and we say ,the semi solid magma just below the Earth crust has no effect due to gravity or tidal pull.

  Now here is my one more hypothesis for this, for Mr Yung and Song to have a look

 Watch orbital year ( Earth year) of planets up to Saturn.  Uranus and beyond are far away to have much pull.( which varies as per inverse of cube of distance)

1) Saturn...around 30 years

2) Jupiter...around 12 year (11.8)

3) Mars....1.9 year ..around 2 years

4) Venus...0.6 years

5) Mercury...0.25 years 

 So ,all these planets can come closest to Earth after every 60 year (LCM of all orbital years -Least Common Multipler)

 Thus when all planets are closest every 60 years ,it moves core