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how will you use vacuum for propulsion??? Even if there would be a black hole in a spacecraft which would suck in air from the front (or the back) side, it wouldn't create any propulsion. The black hole would need to fly in front of the spacecraft to create any lifting force, how will you achieve this? I know, there are some very theoretical ideas of flying with more than lightspeed with such ideas but to me this seems not to be a very practical idea...