The discussion centers on the relationship between a planet's smoothness and its surface gravitational acceleration, particularly focusing on the maximum height of mountains and the percentage of Earth's surface that would be covered by water if gravitational conditions changed during its formation. It highlights that while gravity influences mountain height, other factors such as geological composition, tectonic activity, and isostatic equilibrium also play significant roles. The conversation references the heights of mountains on Mars and Venus, attributing their elevation to lower gravity and different geological conditions. The need for mathematical formulations to relate gravitational acceleration, density, and mountain height is emphasized, with suggestions for further research and relevant literature. The complexities of rock density and compression under pressure are discussed, pointing out that density varies with depth and is influenced by temperature and composition. Overall, the thread underscores the multifaceted nature of planetary geology and the need for a nuanced understanding of how gravity interacts with geological processes.