A forgotten asteroid file held the blueprint for a 226-day Mars round trip. The route is real. The window opens in 2031. A spacecraft leaves Earth on April 20, 2031. 56 days later, it brakes into orbit around Mars. The crew spends five weeks on the surface, then burns for home, splashing down 135 days after that. The full trip, Earth to Mars and back, spans just 226 da... [5098 chars]
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