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From Scientific American:
Over at Nature, Zeeya Merali (a former AAAS Media Fellow here at Sci Am) has an interesting description of plans to keep the Endeavour shuttle on standby in case something goes wrong with Atlantis during the Hubble servicing mission this fall. I think it's worth asking two hard questions. First, is the cost of preparing a rescue mission justified by the likelihood (estimated at one in 400) of its happening? Second, would the cost of such a mission, if it came to pass, be justified?
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