Artist’s rendering of a Mars artificial gravity transfer vehicle. NASA

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The ability to land rocket boosters makes them reusable, substantially reducing the cost of launches. SpaceX

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A statue of Konstantin Tsiolkovsky in Moscow, Russia. Shutterstock/VLADJ

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NASA/Marshall Space Flight Center

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Between the Earth and the moon: An artist’s rendering of a refueling depot for deep-space exploration. Sung Wha Kang (RISD), CC BY-ND

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