Letters to the Editor
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Speeding is one problem, slowing down is a much bigger problem
1/2kv^2 that exponent messes with you big time. Assuming that in order to brake you have to apply thrust in the opposite direction as your current motion. You would need the amount of fuel energy squared to slow down again unless you knew how far you were going and applied reverse thrust at the halfway point effectively multiplying your travel time by several orders of magnitude.
We will never ever ever ever ever ever not ever find any credible evidence of any intelligent civilization anywhere. We are for all practical purposes, alone and unique.