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I would like to point to two theories: first, the conservation of energy, then the so-called "life zone" around some stars. (Also, I am not a scientist, so if my references aren't exact, don't jump on me.)The idea of conservation of energy is that there is a finite amount of energy, or its alternate state mass (E=mc^2, after all), in any closed system. This universe very probably is a closed system, if the Big Bang Theory is correct, and therefore there is a finite amount of energy. Let's say, for argument's sake, that 75% of the energy in the universe it taking the form of matter. Then 90% of that is in the form of the theorized dark matter, leaving us with 7.5% in "normal" matter. Of this, probably 99.99% is the stuff of stars and gas giant planets. Then from what's left over, of the mass of a planet like Earth, we'd figure that, what, 0.0000001% is useful in any kind of interstellar tech? As you can see, we're rapidly approaching a point where resources are very, very scarce, even when you're looking a starting point of all the energy/mass in the universe. I'm modeling this argument after the Drake Equation, of course.