Whilst not wishing to spoil this fascinating debate, has anybody searched for "hollow earth debunked" or such like phrases?
If not, please see here
"... The only possibility to form a hollow planet would be if the planetesimals were in exactly the right locations to have come together in a hollow
shape in the first place.
Is this possible? Sure. The universe is a big place. I don't see why there couldn't be a chance that this might have happened. Is it likely? No way
in hell. I don't know what the numbers are here, but you can be sure the odds are insurmountable. As an exercise in probability, try throwing a
handful of sand onto a table in the hopes it will spell out your name. It might happen, but I sincerely doubt it (and this is far more likely to be a
success than the odds against a planet forming as a hollow sphere).
Conclusion? The Earth has an iron-nickel core and is NOT hollow..." etc.
Just my £0.02...