yeah you went to the space with helecopter.
but can you travel from sylvia to atrox on foot?
(if no then it's a good time to try it)
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2559608408

>Just a Stellaris Fan...
that glitch fixed on 2018/05/09 ,before that version without doing anything, the car will fly to the sky by itself, that's pretty insane

Accidentally ended up in space too, by attaching a large rover to itself with two trailers. Was in an earlier version of the game, so not sure if it still works, as they certainly have changed some of the physics of vehicles.