Musk says the key to his moon mission is a ‘mass driver,’ a giant magnetic catapult that was originally designed in the 1970s. “I really want to see a mass driver on the moon that is shooting AI satellites into deep space,” Elon Musk said last week when he announced his plan to go to the moon. “It’s going to be incredibly exciting to see it happen.” He’s right. I want to see it too, although probably we will both be dead before his vision is realized.