Scientists discover optimal 'space route' to Moon, saving fuel

An international research team has identified a novel and highly fuel-efficient trajectory for spacecraft traveling between Earth and the Moon, potentially slashing the costs of future lunar missions. The discovery comes as lunar exploration intensifies, with numerous missions planned for scientific research, cargo transport, and base construction.

The new route, detailed in the journal Astrodynamics, was found after researchers analyzed 30 million possible Earth-Moon paths using advanced computer simulations. The optimal path involves a unique three-stage process. First, a spacecraft ignites its engine in low Earth orbit, then it makes a close flyby of the Moon within 73 kilometers of its surface. Following this, it enters a stable orbit around a Lagrange point – a gravitationally balanced spot between the Earth and Moon – before a final engine burn to enter lunar orbit.

This method leverages the unstable equilibrium of the first Lagrange point (L1), using its numerous unstable orbits to minimize fuel usage. The researchers employed a new mathematical tool called the Theory of Functional Connections, enabling them to sift through millions of potential orbits. The resulting path allows spacecraft to reduce their speed by 58.8 meters per second compared to previously known economical routes.

Traveling this new route takes approximately 32 days, longer than direct paths but offering significant fuel savings. A key advantage is that spacecraft orbiting the Lagrange point remain visible from Earth, avoiding communication blackouts that occurred during NASA's Artemis 2 mission when it passed behind the Moon. While the current calculation doesn't account for the Sun's gravitational influence, researchers believe incorporating this factor for actual launches could yield even greater fuel efficiency.

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This difference may seem insignificant, but it can have a major impact on the payload and launch costs applied to space missions.