Using advanced computer simulations, researchers uncovered a previously overlooked lunar transfer path that leverages gravitational forces to save fuel and maintain continuous Earth communication.

The study identifies notable contributors, including Vitor Martins de Oliveira of the University of São Paulo and Allan Kardec de Almeida Júnior of the University of Coimbra.

A practical advantage is avoiding communications blackout during lunar occultations by maintaining continuous line-of-sight with Earth at L1, addressing issues seen in Artemis II.

The trajectory, rooted in the Interplanetary Transport Network, outlines a two-segment plan: depart Earth parking orbit to a stable manifold leading to L1, then depart L1 via an unstable manifold into lunar orbit, entering lunar orbit from the Moon-facing side.

The model primarily accounts for Earth and Moon gravity; incorporating the Sun and other perturbations could yield further savings but would tie results to specific launch dates.

Researchers suggest adding forces like solar gravity could yield even more efficient trajectories and foresee broader use of their systematic analysis in future mission planning.

Exploring the Interplanetary Transportation Network and entering the lunar variate from the Earth-opposite side achieves a more efficient trajectory, reducing fuel use by 58.8 m/s versus the prior best path.

The new path saves about 58.8 meters per second of delta‑V compared with the previous best route, providing meaningful propellant savings within a total ~3,343 m/s mission budget.

A Coimbra-led team identifies an Earth–Moon trajectory that maintains continuous Earth communication by routing via the L1 Lagrange point.

The research argues that even decades after Apollo, cheaper Moon routes remain discoverable through systematic, high-dimensional optimization with implications for broader cislunar and deep-space missions.

Findings indicate benefits for both crewed and robotic lunar missions by improving efficiency, reliability, and safety through optimized gravity-assisted trajectories.

Published in Astrodynamics on April 10, the study analyzed 30 million potential paths and shortlisted 280,000 promising candidates using the theory of functional connections to manage complex orbital dynamics.