i wrote a short science fiction story once about a fleet of spider like rocket boosters...that swarm over an incoming comet..obviously they need to be close to the path it is following..but anyway...you pepper the surface of the comet with these spiders..which clamp into the surface and when you have a certain portion of the surface area covered..they fire their rockets in a concentrated direction and if you had enough distance between us and and the comet...you should be able to push it even a slight push overdistance changes the path hugely
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