We don't "have other planets" in any useful sense. We know there are other planets out there. We're a long way from knowing with even a shred of certainty wheth

We don't "have other planets" in any useful sense. We know there are other planets out there. We're a long way from knowing with even a shred of certainty whether we will ever be capable of relocating to them, let alone when it may become feasible or what it will cost.