I heard that 1 year (365 days) at 1 G acceleration got you to 0.77 C. From what I figured, 20% the speed of light could be reached at 1G in 95 days (94.54545 days at 9.81 m/s^2= 20% the speed of light). So could we get to anywhere interesting at that speed?
If we could reverse the force to slow down, how long would we have to coast plus decelerate for 95 day, to get somewhere interesting?
Then it becomes the question of how to sustain 1G acceleration for almost 200 days plus survive the coasting.
Just curious if there is anything out there we would be interested in getting to in 2/3rds of a year out plus 2/3rds of a year back not including the coasting . It is a long time to be gone.

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it a neat thought but to much. 1G constant force is a lot of power. i thought of a similar one but at 1inch/s of acceleration for ten years. and then the same in deceleration for another ten. i forget the exact numbers but it might get to alpha centuri. it's rather far away but small amount of acceleration for a longer period is somewhat more feasible tho a sustained 1inch a second for ten years is still a butt load of power thats pretty well non existent in space. and don't have to many fantasies about dark matter being there for us hahahaha... Dark matter is like the sum of a misunderstanding so lets try not to go straight to fanciful ideas...

and perpetual motion in itself is a common thing (ie constant motion), it's just to take the perpetual motion of matter and turn (entropy) it into a usable source of power for us to use can be much more complicated... let alone the fact that we're talking about generally empty space.