So will mass.  The more you accelerate towards the speed of light, the more massive and the more energy required to propel the mass.  That's why the only thing nearing light speed is, well, light (massless particles).  By the time you're moving 80% the speed of light you'll need a couple million spare stars for power. :)

Longetivity, modes of transport, take-it-all-with-you are all speculative unfortunately.  The problem with the latter 'entire biosphere' ideology is that, for instance, Earth isn't a closed system.  It has been fed by asteriods, comets, dust, solar radiation, and extra-solar radiation for billions of years.  Life on Earth is dependent completely on the Sun - ignoring vent life and subsurface microbes.  So, you'd essentially want to take your entire solar system out for a spin - the propulsion being?

I'll take two tinfool hats and an ACME laser blaster to go. :)

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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