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The habitable zones of low-mass stars are characterized by escape speeds thatcan be a few times higher than the Earth's orbit around the Sun. Owing to theexponential dependence of the required fuel mass on the terminal speed forchemical rockets, interstellar travel may not be easy for technological speciesinhabiting planets around M-dwarfs.

Limitations of Chemical Propulsion for Interstellar Escape from Habitable Zones around Low-Mass Stars