What is the earliest reference for planetary differentiation?

24 June 2013 1 7K Report

There are plenty of references about density distribution out there, but I am struggling to find a good early citation for use in a publication. Any bright ideas?

Szaniszlo Berczi

May I propose the authors in the 19th century who – on the basis of the existence of stony, iron, and stony-iron meteorites – suggested the idea of asteroidal or planetary differentiation.

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