SpaceX has big dreams to build cities on Mars and bases on the moon at the same time, one of the plan’s key architects revealed over the weekend.

Paul Wooster, SpaceX’s principal Mars development engineer, explained that the Starship vessel under development is designed for versatility. That means, as the company aims to complete its first city on Mars by 2050, there’s no need to switch development priorities or move the focus to complete one or the other.

“The [Starship] system also opens up capabilities, for example, to deliver very large payloads to the moon, set up and operate lunar bases,” Wooster explained on Saturday at the 22nd annual Mars Society Convention at the University of Southern California. “Because it’s the same system that’s being used for going to the moon and going to Mars, it’s not something where you have to stop going to the moon in order to go to Mars…we’re really excited about the possibilities of doing both, having bases on the moon while we’re also setting up these cities on Mars.”