Space as a Reactive Medium: A Fluid-Dynamic Approach to Gravity, Inertia, and the Dark Matter Problem

Modern physics often treats space as either an abstract mathematical geometry (in general relativity) or a quantum vacuum filled with fluctuating fields (in quantum mechanics). However, neither framework adequately explains key physical anomalies such as the Pioneer anomaly, the Casimir effect, or galaxy rotation curves attributed to dark matter.This paper presents a new model that treats space as a reactive physical medium with fluid-like properties. Using a fluid-dynamic framework, we derive equations showing that matter moving through space interacts with it—displacing, absorbing, and expelling space in a way that mirrors hydrodynamic behavior. These interactions provide novel explanations for gravity, inertia, and unexplained resistance effects in cosmic motion.We also propose that dark matter may be an emergent effect of spatial resistance rather than an exotic particle. The model offers reinterpretations of cosmological observations, including black holes and the cosmic microwave background, as structural phenomena of space itself. This approach lays the groundwork for a unified and physically intuitive foundation for fundamental physics.