We know that our earth's core is made up of iron-nickel alloy and it is spinning to create magnetic flux all around our planet to create our life-saving Magnetosphere. And this also influences our 9.8 m/s gravitational force I think. So what if our core (both inner-solid and outer-liquid)is made up of copper or any other metals. How will it differ from our Magnetosphere and gravitational force?

  • $\begingroup$ This question might be better suited to either SE World Building or SE Physics $\endgroup$
    – Fred
    Oct 24 '19 at 11:27
  • $\begingroup$ I don't see the point of fanciful 'what if?' questions about imaginary worlds. I think questions should be about the real world we find ourselves in, not about some other world which we would prefer, or imagine in our dreams. $\endgroup$ Oct 24 '19 at 12:38
  • $\begingroup$ What if the Earth's rotation speeded up one hundred-fold, how would that affect our daily lives? $\endgroup$ Oct 24 '19 at 13:23

On a quick approach:

  • Magnetism. The copper itself have a weak magnetism, so a copper core will not create a magnetosphere. Chek here or here.
  • Gravity. The Iron density is 7.874 g/cm³ and the nickel density is 8.908 g/cm³. Copper density is 8.96 g/cm³. So with those density data, the core will be heavier. (The actual core is supposed to have a 9.9-12 g/cm³ density) It is supposed that this additional mass will increase the gravity. What it is not well determine is the % of iron and nickel at the core, so, we can talk on probably a raising on between 5-15% the actual gravity force.

Regarding some other metals, it will depends on magnetism and density.

Hope it helps!

  • 2
    $\begingroup$ That's not quite correct. It's not the iron's magnetism that creates the earth magnetic field, but rather the electric currents that are flowing in the liquid iron. These would also be flowing in liquid copper. $\endgroup$ Oct 24 '19 at 20:27
  • 1
    $\begingroup$ Iron's Curie temperature, at which it loses its ferromagnetic properties, is 1043 K. Earth's core temperature is around 6000 K. So unless the Curie temperature increases considerably with pressure, the core magnetism is not due to iron's ferromagnetism. $\endgroup$
    – jamesqf
    Oct 25 '19 at 4:56
  • $\begingroup$ It is not the iron's magnetism, for sure, is the motion generated by the core flows. Copper can not create it. Un the Curie temperature is related with the pressure $\endgroup$ Oct 25 '19 at 5:15
  • $\begingroup$ @Fred: But that's at around room temperature, and in solid materials. Liquids at high temperatures might well behave differently. $\endgroup$
    – jamesqf
    Oct 25 '19 at 17:27

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