"The 150-foot-wide asteroid 2012 DA14 — which will zoom within 17,200 miles of Earth on Friday, marking the closest approach by such a large space rock that astronomers have ever known about in advance — may harbor $65 billion of recoverable water and $130 billion in metals, say officials with celestial mining firm Deep Space Industries."

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See also: http://www.kurzweilai.net/how-much-is-an-asteroid-worth
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