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Edited by Kamots: 1/24/2015 10:46:08 PMThey probably can't. The only argument I could think of that might work would be the Force, but I don't think there is any evidence supporting that.
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The forerunners can sort of do it with theline installations and slow it down with the halos. I know of a machine in star wars that forced ships out of hyperspace but it only worked once I think.