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It is well known that interstellar travel is bounded by the finite speed oflight, but on very large scales any rocketeer would also need to consider theinfluence of cosmological expansion on their journey. This paper examinesaccelerated journeys within the framework of Friedmann-Lemaitre-Robertson-Walker universes, illustrating how the duration of a fixedacceleration sharply divides exploration over interstellar and intergalacticdistances. Furthermore, we show how the universal expansion increases thedifficulty of intergalactic navigation, with small uncertainties incosmological parameters resulting in significantly large deviations. This paperalso shows that, contrary to simplistic ideas, the motion of any rocketeer isindistinguishable from Newtonian gravity if the acceleration is kept small.

The Adventures of the Rocketeer: Accelerated Motion Under the Influence of Expanding Space