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I remember seeing a not very good documentary on Asterioid Doom on BBC2 recently, current thinking seems to be land something on the asteroid after you've determined is composition. Big and metal is good if you're using nukes, loose and rocky is bad as you get a shotgun type effect, not good. And for a while there the nuclear weapons techs were leading the running until an inconvient loosely packed rocky asteroid exploded over Canada.
The Near spacecraft managed to do a landing even when it wasn't designed to land on an asterioid, which is pretty impressive. If you got there early enough an Ion engine might be good enough, if you had enough time.
It's probably a good thing that we might have a few nations other than America which have the expertise to mount this sort of thing in the next 5-10 years, they could run multiple missions. Heh perhaps India and Brazil could save the world this time. |
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