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Old 01-22-2018, 12:35 PM   #881 (permalink)
sendler
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They did at least mention resource depletion. Again, anyone that runs the numbers will easily see that the energy required for harvesting an asteroid and bringing it back to earth orbit falls squarely past won't happen into the category of can't happen.

What is the total sum of mass we ever brought back from the moon? Which is several orders of magnitude energetically closer than the asteroids.