Was Starkiller Base a rogue planet, wandering through the galaxy/universe?
The planet could be similar to Zonama Sekot,( a sentient world born from the homeworld of the Yuuzhan Vong, and capable of hyperspace travel.)
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Depends on your definition of Rogue Planet. If any planet equipped with Hyperdrive capabilities, then YES.
From Pablo Hidalgo's Twitter:
The Starkiller is mobile. Able to travel distances in hyperspace amid a very populous star cluster.