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But what about the bit about not hitting anything whilst travelling at that speed? Even a speck of space dust would do massive damage at those speeds, right?
Oh yeah, it's like flying the wrong way down the tube of the Large Hadron Collider. The tougher challenge though is like @MuThyme@lemmy.world said maintaining 1G acceleration. Following the rocket equation, which is logarithmic, a 50 year multi-stage rocket will be bigger than the universe itself, even if you use some kind of nuclear propulsion 10000 times more efficient than our chemical rockets.