system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry potter] what if Voldemort sent one if his horcruxes to space flying away from earth. Would he essentially become immortal for ever or is there some sort of distance parameters required?
gpt
Well assuming it just drifted forever, if he needed to be reincarnated it would be at the location of the horcrux in a pretty limited, slightly more than ghostly form with very little ability to do anything for himself. So he'd be stuck drifting forever in space, immortal yes, but not how he wanted it to be.

As for apparition, it's doubtful he could do that and even if he could apparently  there's a range limit for magical teleportation, who would've thought? And the distances in space make that range limit look like peanuts. 

Unless the spacecraft has a fireplace attached to the flue network and he has a loyal Deatheater ready to go fetch him after he died. A portkey is 50/50, after all the spacecraft with the horcrux is a moving target.