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Nov19-11, 08:52 AM
P: 109

With the "before" orbit of YU55, there would be zero chance of the asteroid colliding with Mars since it never crosses Mars' orbit. With the "after" orbit of YU55, there are two times that the asteroid crosses Mars' orbit. This has to increase the chance of a collision between the two bodies with all things remaining the same. I assume that YU55 and Mars are on the same orbital plane.