Cinematic and pictures at a angle tend to blow up proportions. Have you calculated the amount of energy it would be needed to move that thing?
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Enough that the core to power the thing could wipe out half the system at least
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By my half-hour calculations and intense research the dreadnaught would take roughly 77.5293742 pounds per cm^3 to move itself
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Well that would require knowing it's mass. Which is, well, impossible to find out.