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The amount of energy required for fast interstellar travel is mind-boggling. People do not comprehend the scale. Even with ridiculous things like massless fuel it would take multiple times the entire yearly energy expenditure of the earth for an ISS sized ship to travel 10 light years before the passengers died of old age.

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It’s almost like we never need to do it: just send seeds of life out into space: if we send people we can never hear from them again anyway. We can’t get the information back. So it’s mostly a hedonic exercise: a one way adventure holiday for the crew.

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