If a civilization can cross interstellar space, the war is already decided. In this episode of Entropy Rising, we examine planetary invasion through the lens of real physics. No cinematic dogfights. No convenient alien weaknesses. Just propulsion energy, orbital mechanics, and strategic reality. Any ship capable of traveling between stars already carries extinction-level energy. Once an invading force controls orbit, they don’t need to land troops. They can freeze a planet with solar shades, ...