Travel characteristics of a solar sail. Results are shown as per Eq. (19) and as a function of the launch distance from the Sun (abscissa) and mass per cross section ratio over the radiative coupling constant (ordinate). Horizontal dashed lines refer to an aerographite hollow sphere with shell thickness values corresponding to those chosen in Fig. 2. Panel a: terminal speed at infinite distance from the Sun. White contours show v∞ in multiples of the speed of light (see white labels). Panel b: travel time to the nearest star, Proxima Centauri. White contours refer to constant travel times (labeled in white).
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