“There are far, far cheaper upper stages that could be used for the rocket’s primary function to launch the Orion spacecraft to lunar orbit, including United Launch Alliance’s reliable (and ready) Centaur V upper stage. With Starship and New Glenn, NASA will also soon have two very powerful commercial super heavy lift rockets to draw upon.”
Centaur V looks good.
But putting “Starship” and “soon” in one sentence in the context of “next super heavy booster” is a bit of a stretch.
