If we can source some of that from the moon and eventually from mars, that will allow us to bring more and to go more often. making our own fuel makes regular trips to and from the gateway space station much more viable. now, mining moon dust is called isru... and, because they love an acronym round these parts, the robot to do this will be called the isru pilot excavator, ipex. we had to really reinvent how you do excavation for doing mining on the moon, and eventually mars. the challenge is the technology we have for mining here on earth relies on a lot of mass and a lot of weight, right? the more steel you put on an excavator, the heavier it becomes and the better it digs. we can't launch something as heavy as we want on a rocket. it's still very expensive, right? so we have to reduce the mass