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Comment: Re:Great, how long till we can strip mine them? (Score 1) 112 112

From what we know about asteroids, they seem to be composed mostly of things like iron, nickel and silica, none of which are particularly rare or hard to extract here on Earth. Preventing an impact event is one thing, but it's doubtful that there's much money in harvesting asteroids.

Work expands to fill the time available. -- Cyril Northcote Parkinson, "The Economist", 1955