I don't believe in a magma filled ball Earth theory either.
Well I at least studied geophysics in university level...
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rectilineator
Only intellectually sound discussion, please. This is not NASA!
The North Star is one of the easiest "disproofs" I have managed to operationalize. If it is at the same time visible to all the people in the northern hemisphere as usual, but also to some in the southern, then either Earth is not a globe, or it is transparent
