If the planet spins, it is hollow because centrifugal force will force heavy elements away from the center while gravity will push towards the center. The balance generated between centrifugal force and gravity is where most heavy elements exist and also where we all walk.
What Earth may actually look like inside:
Science and history Books must read:
https://www.amazon.com/Hollow-Planets-Feasibility-Possible-Worlds/dp/099134975X
http://www.sacred-texts.com/earth/jei/index.htm
https://www.amazon.com/Ultimate-Reality-Vol-1-2/dp/0787313408
https://archive.org/details/etidorhpaorend00lloy
https://archive.org/details/smokygodorvoyage00emer
https://www.amazon.com/Passport-eternity-Laurence-W-Foreman/dp/B0006CKPPW
Japanese scientists on Hollow earth: http://zao.jp/index.php?blog=12&p=340&more=1&c=1&tb=1&pb=1
To be honest, that's lame
The sheer amount of research that is undergoing is overwhelming. I always wanted to use those two words in a single sentence. Bless me!
Thats Interesting!
I wonder what it would look like with magnetic fields in the mix?
Imagine the spinning hollow shell generating magnetic field, hollow shell is where most iron nickel is. Center of the earth like a small ball of plasma acting as pseudo sun.
Right But this is where I become sceptical. Is the differance between the plasma ball and the nickle iron shell enough to generate the magnetosphere?