Lunar Hypertelescope Roadmap Revives Apollo-Era Concepts with Modern Robotics and Formation Flying

{"The paper synthesizes six decades of lunar astronomy proposals, noting that Apollo-era studies collapsed under launch costs and lack of sustained operations rather than fundamental physics barriers. Current enabling technologies—additive manufacturing for mirror segments, autonomous formation flying, and precision metrology—directly address those gaps. The authors argue that diluted hypertelescope arrays spanning 500 m to several km could achieve imaging of exoplanet surfaces and stellar surfaces at scales impossible from Earth or low-Earth orbit.","Analysis of missed opportunities shows that earlier concepts over-relied on human-tended large apertures instead of robotic, modular deployment now feasible under Artemis and Chinese lunar programs. Cross-referencing with the 2023 NASA Lunar Surface Science Workshop reports and the 2024 ESA lunar observatory white paper reveals consistent underestimation of how commercial lander cadence reduces per-mission risk. The roadmap prioritizes radio-quiet far-side sites for both optical and radio arrays, a synergy rarely quantified in prior single-discipline studies.","Key limitation remains the absence of any end-to-end technology demonstration at lunar scale; the paper relies on terrestrial testbeds and simulations. Strengthening evidence would require a funded 10–20 m baseline robotic interferometer precursor within the next five years to validate thermal stability and autonomous alignment under actual lunar conditions. Without such a step, projections to kilometer baselines remain extrapolations.","Integration with ongoing south-polar infrastructure could accelerate timelines, yet the review underplays coordination challenges between international partners and the need for standardized optical metrology protocols. Success hinges on treating astronomy payloads as secondary payloads on early landers rather than standalone mega-projects."}