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Fridge Logic: The Messiah has an Orion Propulsion System and was assembled in space. It's way too small to be one. (Orion was a military project to build a deep space craft in the late 50's, it works by exploding nuclear bombs behind a very thick metal plate and getting hit by the explosion. Most designs are assembled on the Earth and are about 1 mile in Radius).
Further, if it was an Orion Craft, which could achieve the course required by the ship to not only reach the comet, but match course with it, there would be a heck of a lot more nuclear weapons on the ship. No reason to not simply try again at altering the course of the comet fragments.
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