An asteroid made of mostly iron, to have any impact on the commodity market for iron or steel, would have to be worth a good deal more than $139 billion. An asteroid containing significant amounts of some less common material (e.g., rare earth metals) could potentially have an impact on the commodity prices of those -- if it were economic to capture and mine the thing, which of course it's not, at our current level of technology.
In fact, however, this asteroid probably doesn't contain anywhere near $139 billion worth of metals at commodity prices. (It's only about the size of a football field, and they don't yet know precisely what it's made of.) The article talks about how much its materials would be worth in orbit, which is mostly a function of how expensive it is to get things up there from the surface. For example, they're imagining it might contain water, which could be used as reaction mass for spacecraft. On the surface, water is one of the cheapest materials there is. (Air is even cheaper.) But it costs money to lift it out of Earth's gravity well.
They're dreaming, though. Without sci-fi technology (e.g., a tractor beam), capturing (let alone mining) a passing asteroid would be a ridiculously expensive (and also dangerous) operation, and all the equipment and personnel needed to do it would have to be lifted to orbit from the surface.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/IcLYuoa7LQM/story01.htm
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