In a manner relating to the physics of the earth, including its structure, composition, and physical processes.
From geophysical (adjective, from geophysics) plus the adverb suffix '-ly.' This adverbial form standardized in 20th-century scientific writing.
When scientists describe how 'geophysically similar' two planets are, they're comparing everything from magnetic fields to mantle density—language revealing that Earth's physics is just one solution in a multiverse of planetary possibilities.
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