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Would spaceships have to worry about nebula drag?

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There are really two components to drag that need to be considered: the force needed to move particles in the flight path out of the way of the oncoming craft, and the backward pressure those particles exert as they try to fill the deeper vacuum left in the craft's wake. read more

Speaking technically, there is going to be some drag effect anywhere in space. The deepest vacuum has about 1 atom or molecule for every 10 [math]cm^3[/math], which adds up significantly when we are talking about traveling across light years. read more

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