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It really depends on the size of the asteroid and early detection.  I am all in favor of funding that allows scientists to continue to keep looking.  There is really no need for a moon based platform for this purpose.  I agree that blasting one into smaller chunks is probably not a good idea.  A real killer asteroid will only become a group of killer asteroids if it is big enough to cause a world ending event.


If it is caught early enough, I do think that ion propulsion technology may be able to shift the trajectory enough to avoid an impact.  This concept is promising if early detection is possible.


I do, however, see other applications for a moonbase.  It would certainly be s great jump platform for planetary exploration and even deep space probes especially if water deposits were found on the moon.  The fact that it is a very low gravity environment is another advantage.


-Castle


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