Board Thread:New on SporeWiki/@comment-1309126-20150816180546/@comment-47205-20150820070933

If the fantasyverse is anything to go by, space isn't going to be a problem even on an Earth-sized planet (and I don't think most people are likely to make creatures that are suited to living in 5g, or would it be an artificial planet with just a crust around an Earth-mass black hole?).

As for a double planet in which both bodies were inhabited, in that case it would be reasonable for even a 20th-century-equivalent civilisation to engage in frequent space travel between the two; it's just that in our world there's little practical motivation to go beyond low Earth orbit. So in principle that could work and the planets wouldn't be isolated, even though we do intended for there to be relatively little interplanetary travel here otherwise it'll be just another scifiverse.