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TOPIC: wekipedia Detecting the attack (spoilers)
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Dwight E. Howell (Visitor)
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wekipedia Detecting the attack (spoilers)  
This is just going to splatter the inbound, you won't get enough sideways velocity to save the planet. A change in velocity should be as good as a change in direction, shouldn't it? The planet is moving as well, after all. In this case, no. Lets assume an intercept 1 light-hour out of a projectile at .9c and aimed for a central impact with Earth. Knocking it aside:  We need to impart 4000 mph to generate a miss. Slowing it that much, though, what happens?  At the moment that it would originally impact it's going to be still 4000 miles away.  It's going about 170,000 mps so that means it hits about 1/40th of a second later.  During that time the Earth moves less than half a mile. Extending this, we need to slow it by more than 8000 times as much as we need to deflect it. Of course if you hit it that hard a good deal of it is still going to be heading on a path that will miss the planet. Maybe all of it. One of the thing you learn from shooting through twigs is that hitting one can instantly change the path of the bullet hugely. Sure the missile/bullet might plow through a leaf or something and end up where it was aimed but nobody with experience is going to bet on that or expect it. If it hits a twig, no way. Your missile could change directions by thirty degrees or more while tumbling wildly. Tumbling won't change it's course one iota.  It's not in atmosphere! Tumbling/spin would just be a side effect of the impact if anything wasn't turned into plasma. I wonder if you would have a gyroscopic effect or if the rpms would be high enough to tear it apart? Maybe some of both?
 
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wekipedia Detecting the attack (spoilers)
Dwight E. Howell 2010/02/23 15:17
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