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I'm not claiming to 'know' anything about liquid mercury or gravity modification propulsion systems other than what I've read and heard.
But to me, common sense tells me we can't travel the vast distances to other solar systems and galaxy's the same way we travel to the grocery store or even our conventional aircraft.
Unless we find a way to sidestep the distance, we aren't going at all.
I mean, using today's technology, it would take 6300 years to get to Alpha Centauri, and everyone aboard would be a mass of tumors in 6 months.