alt Hacker NewsAlso as for changing course - that is in many cases impossible, at least unless you want to make it 100% certain that you will die alone in the coldness of space. Just too much energy needed to signficantly change the trajectory & starts, at least in our part of the Galaxy, being too far apart.
A small nudge near the outset would produce a massive ultimate change in’s trajectory, so maybe not too much energy is needed to redirect.