The number of things
• Emily Sandford,
• Zephyr Penoyre
The most basic view of the universe is of a uniform power spectrum of density pertubations, and gravity being the dominant force leading individual objects to collapse and form. Thus number density per unit mass $$\left( \frac{dN}{dVdM} \right)$$should follow a simple relationship $$(\propto M^{-2})$$. This is broadly true across a huge range of scales (see figure \ref{125409}) ,  and any deviations bely the more nuanced interaction of other physical processes which we will discus in more detail.