The Universe of Honor Harrington

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The first manned interstellar ship departed the Solar System on September 30, 2103. Although no other ship followed for almost fifty years, 2013 ce, became accepted as Year One of the Diaspora, and January 1 of that year became January 1, 01 pd for purposes of interstellar dating.

For over seven centuries after the Prometheus became the first manned starship, FTL movement remained impossible, leaving generation ships (followed in the fourth century pd by the development of practical cryogenic hibernation vessels) as the only means of long-distance interstellar expansion. The original starships used fairly straightforward reaction drives with hydrogen catcher fields to sustain boost after the initial onboard reaction mass was exhausted. Later generations attempted more esoteric propulsion systems, but though they graduated to fusion and photon drives, they remained locked into the sublight reaction principle until 725 pd, when the first crude hyper drive was tested in the Solar System.

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