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Why is fission likelier than fusion for first Moon bases?

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Answer: Fission is far nearer deployment

Fission is far nearer deploymentCorrect! Controlled fusion remains a demanding research frontier, while small fission systems are much closer to deployable hardware. That is why current lunar power programs focus on reactors in the kilowatt-to-tens-of-kilowatts class, not on fusion plants.

Fusion cannot work in vacuumNot quite. Vacuum is not the decisive issue here. The real difficulty is that controlled fusion still requires extreme plasma conditions and complex systems that are far from practical early lunar deployment.

Fusion needs Earth gravityNot quite. Fusion does not depend on Earth gravity. Stars use gravity to help confinement, but human fusion concepts rely on magnets, lasers, and engineering. The reason it is not the near-term Moon choice is maturity, not gravity.

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