A week ago, China launched the newest version of its largest rocket, the Long March 5B, from its southernmost spaceport. The launch proceeded normally and represented another success for China as it seeks to build a robust human spaceflight program. Over the next few years, this rocket will launch components of a modular space station.

Notably, because of this rocket’s design, its large core stage reached orbit after the launch. Typically during a launch, a rocket’s large first stage will provide the majority of thrust during the first minutes of launch and then drop away before reaching an orbital velocity, falling back into…