From: mikkelhaaheim@gmail.com   
      
   Le lundi 31 octobre 2016 02:22:07 UTC+1, Sjouke Burry a écrit :   
   > On 30.10.16 21:56, 0something0 wrote:   
   > > but what about redirecting large asteroids? Not enough to devastate a   
   planet but enough to devastate a large region? You can't do that with nukes.   
   > >   
   > Have you tried to estimate the mass of a large asteroid?   
   > volume=4/3.pi.r.r.r, for 100 meter ~ 4 milion cube meter   
   > at 1 to 5 ton per cube meter, so 4 to 20 million   tons.   
   > No chemical rocket will be powerful enough to change   
   > the trajectory the way you wish.   
   > And if you use a nuclear drive, you might just a well   
   > use a nuke.   
      
   Nuclear drives are not necessary. Mass drivers or batteries of ion or   
   electrothermal drives, powered by sufficiently large solar arrays, would be   
   manageable.   
      
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