The discussion centers on the relationship between the expansion of the Universe and galaxy clustering. It posits that while the expanding Universe increases the volume of space, it does not necessarily lead to less clustering; in fact, there may be more clustering in certain conditions. The rate of expansion influences clustering dynamics, as overdense regions can collapse if they possess sufficient mass. Conversely, a faster expansion requires more mass or smaller sizes for collapse to occur, resulting in less massive galaxies that are more distantly spaced. Overall, the interplay between expansion rate and mass distribution is complex and critical to understanding galaxy formation.
