Although these achievements have allowed SpaceX to reshape humanity’s journey into orbit in its own image, they overshadow what could be the company’s most impressive, and most iterable, legacy: A growing universe of former employees have founded companies dedicated to solving the next generation of very hard engineering challenges. By applying what they learned at SpaceX, especially its once-heterodox approach to problem-solving, they’re seeking to remake much of the industrial economy—and potentially become the next SpaceX.