Re: Semi-OT: We will go to Stars.
I think the real problem is the effect of time-dilation (when travelling near the speed of light, time "slows down" by a factor of 1/sqrt(1-v^2/c^2), so travelling at 99.99% the speed of light makes 5000 years seem like 1 year).
In other words, the Earth goes through another ice age every time you go on vacation.
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Assume you have a 1kg squirrel
E=mc^2
E=1kg(3x10^8m/s)^2=9x10^16J
which, if I'm not mistaken, is equivilent to roughly a 50 megaton nuclear bomb.
Fear the squirrel.
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