His answer was very vague he didn't say that there was "one" explorable area per planet but he mentioned that they're calling the planets "destinations" and that they've already revealed all the "destinations" in the first version of the game which are "planets". So far we have Earth, Moon, Mars and Venus and they've also mentioned or have info on Mercury, Jupiter and Saturn and their Moons. We don't know how many or how big each area will even be. So I suggest for everyone to sit tight and wait until release.