Well, there are reasons for war even in a post scarcity society...
1. Someone who isn't in power wants to be in power.
2. For the Evulz
(especially since a human life being lost in a war is unthinkable in these times of lag free communication with virtually unlimited bandwith over interstellar distances and compact automated factories capable of building an army.)
3. It's not quite post scarcity. Everyone has as much energy as they need, but people always want more, even if they have no reason for wanting access to a tsar bomb's worth of energy (more like a few million in their solar system alone) every second. (most of that goes into interstellar travel anyway.). And while space habitats and terraforming have helped alleviate.
How does this sound for a form of interstellar travel?
Interstellar travel begins with a trajectory through a solar system to an interstellar vector seeded with dense clouds of hydrogen. On the initial acceleration to 10% of light speed, the ship is powered by a Bussard Ramjet, which uses a magnetic "scoop" to gather the hydrogen for fusion torches. To keep the craft's mass down, the products of the reaction are used directly for thrust instead of acting through an intermediate reaction mass.
Once the craft has reached the edge of the solar system, now traveling at 10% of light speed, it stars accumulating hydrogen from the interstellar medium. About a month later, the ships main antimatter powered engine, which uses the hydrogen as reaction mass. When the hydrogen is depleted the main engine turns off, and the magnetic scoop begins accumulating hydrogen. The ship accelerates to a final velocity of .50 c over several years, then coasts for several more. In the final leg of its journey, after depleting the antimatter, the ship rotates its fusion thrusters towards the destination and fires them. Because of drag caused by the magnetic scoop (which remains off during main engine burns) catching the extremely high velocity (relative to the ship) hydrogen particles, the ship decelerates fairly quickly.
edited 14th Mar '11 7:10:37 AM by Archereon
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