This paper examines the strategic necessity of a permanent planetary defense architecture in response to the persistent threat of asteroid impacts. The Solar System is a dynamic environment populated by millions of near-Earth objects (NEOs), some of which follow trajectories that intersect Earth’s orbit. Historical evidence—including the Chicxulub impact that caused the extinction of the dinosaurs—demonstrates that large-scale collisions are inevitable on geological timescales. While extinction-level events require asteroids approximately 10 kilometers in diameter, even smaller objects pose catastrophic regional or global risks. The unpredictability of detection timelines creates a critical vulnerability: late discovery would leave insufficient time to design and deploy effective mitigation systems.

The paper proposes a proactive planetary defense framework, “Terrashield,” integrating artificial intelligence–driven detection and trajectory modeling with megascale space infrastructure. Advances in AI enable continuous monitoring of astronomical datasets, rapid risk assessment, and optimization of interception strategies. Simultaneously, emerging space-based capabilities— including orbital manufacturing, autonomous assembly systems, kinetic impactors, and the potential development of a space elevator— could support a standing, continuously operational defense system rather than emergency response missions.

Multiple mitigation strategies are analyzed, including kinetic impactors, gravity tractors, nuclear deflection, laser ablation, asteroid redirection, and artificial impactor construction. Each alternative is evaluated in terms of feasibility, effectiveness, technological readiness, and political implications. The paper includes a recommended solution with the combat stations as essential instruments to intercept and deflect any incoming asteroid. The study argues that the cost of preparation is negligible compared to the irreversible consequences of inaction. Planetary defense must therefore be recognized not as speculative ambition, but as a global moral and strategic responsibility to safeguard civilization and future generations.