If interstellar travel is as time- or energy- demanding as the above figures indicate it is far from obvious what the motive for colonization might be.
Restless and in desperate need of adventure I quit my job at an insurance company to travel west with a couple of guys I smoked pot with scandalizing my family.
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It would be a pity if frustrated by the price of travel we elected to become a society that never made contact that never gave SETI a fair chance.
