"newshound" napisal w wiadomosci
eb.com...
On 12/12/2012 09:04, Szczepan Bialek wrote:

The only "cause" of the metal core is the calculated density 5.5.

No, a metal core rather helps to explain the magnetic field.

Some years ago Rowland proved that rotaing charged body create the magnetic
field.
The Earth has the excess of electrons and must have the magnetic field
because is rotating.

Plus, analysis of earthquakes
gives good information on internal structure of the earth.

And we have had similar sensors on the moon, confirming the absence of a
metal core.

The Moons do not rotate and there no magnetic field.

One
of the surprises from the Apollo programme was how little "damping" there
was for lunar
vibrations set up by deliberately crashing the orbiter.

The Moon is cold. The damping is temperature dependent.
S*