Families of stable, prograde, low-energy Earth-Moon cycler orbits loop between geocentric and selenocentric trajectories indefinitely without propulsion or station-keeping propellant: resonant gravity assists from both bodies naturally maintain the repeating shuttle corridor, eliminating the heavy fuel overhead required to accelerate and decelerate large habitat shielding on cis-lunar transit runs.

2026-10-20: Coupling Sun-Earth L1/L2 manifolds to Earth-Moon cyclers eliminates the km/s braking burn otherwise required to capture asteroid payloads into cislunar orbits

1: Asteroid material arrives at the Rim, about 1.5 million km out, on natural paths into orbits around Sun-Earth L1 and L2. 2: From the Rim, refined material coasts to the Moon on gravity alone (~40 days) and is captured. 3: A few m/s burn puts it on an Earth-Moon cycler, which drops packages onto other orbits along its route. The Earth-Moon system is threaded with natural routes like these. Find the right ones, and moving material around cislunar space costs 10s of m/s, not km/s.