The problem with ideation and science is that the concrete nature of the external world is often ignored in the pursuit of pushing the permitted bourgeois envelope ever further toward ethereal theories that are non-threatening to the capitalist status quo – as bourgeois science can never be used to discredit capitalism in anyway. having said that, I think the distances are so vast between solar systems and different parts of the universe-multiverse – that humanity will not be able to traverse these distances in the traditional sense. A single light year still represents the distance light travels in one-year (5.88 trillion miles).