Hollow Earth Returns to the Physical Stage: TMMC Theory Enters the World of Geology

This document examines the stability of Earth’s system over 4.5 billion years under the traditional hypothesis of a “solid Earth with a molten core,” and presents a comparison with the Multi-Medium Cosmos Theory (TMMC). The study shows that a purely solid structure is insufficient to maintain Earth’s long-term thermal, magnetic, and gravitational stability, highlighting the role of an internally dynamic medium as proposed by TMMC.