But is it in the same system as Endor? How far could that wreckage travel in three decades?
It doesn’t say yet, though in the old canon Endor (the planet) had 9 moons (incl. Endor the moon) so it could be one of them. Or alternatively it could be a different planet in the same system. I’m not very knowledgeable in physics (and SW isn’t exactly known for being scientifically accurate) but I’d imagine something propelled by the force of the DS II explosion should be able to travel to another planet in the same solar system in 30 years?