Ultimate space-manufactured solar sails will allow the possibility of Earth-Mars round trips with durations measured in months rather than years. The same technology may allow visits to the nearer stars at solar-system exit velocities higher than 1,000 km /sec. The one-way travel time to the Sun’s nearest interstellar neighbors (proxima and Alpha Centauri) will be about 1,000 years for such spacecraft. Advances in laser and maser power-beaming technologies may eventually substantially reduce interstellar-voyage durations.
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