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It would be great if you could build a base on other planets or even on the home planet...
I've got around 130+ hours into the game, and have yet to make it to some of the outer planets and their moons.
I'd also recommend two mods: MechJeb and KAS (Kerbal Attachment System). KAS adds a whole new dynamic to the game by making EVA's while in orbit useful. You can store parts in containers that can be placed in cargo bays and attach, repair, and replace parts while in orbit using that mod.