During a lengthy news conference on Friday, NASA provided a detailed overview of how it plans to return astronauts to the lunar surface as soon as 2028 as part of its Artemis Program.

Although much of the information behind these plans has been previously reported at Ars Technica and elsewhere, this marked the first time NASA has laid them out in detail and acknowledged some substantial changes in the architecture.

Most notably, for SpaceX's Starship vehicle, the revised plan calls for the Orion spacecraft to dock with the Starship lunar lander in high-Earth orbit before transiting to the Moon. And for Blue Origin, the mission architecture includes four launches of the New Glenn rocket, but no spacecraft-to-spacecraft refuelings. Additionally, the Blue Origin plans allows for the possibility of its Blue Moon lander rendezvousing with Orion in low-Lunar orbit.

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NASA does not have, nor want, nuclear weapons. But when it comes to a particular metric that is part of the Artemis Program to land people on the Moon, NASA guards a particular number like it is trying to prevent outsiders from cracking nuclear codes.

I am speaking of the number of Starship launches required to fuel a Starship-based lunar lander in low-Earth orbit such that it can fly out to the Moon, land there, and return to lunar orbit.

This number has been a moving target over the years. The general response from NASA has typically been, 'We don't know for sure, so we're not going to say.' In 2023, for example, the then-director of NASA's Human Landing System, Lisa Watson-Morgan, told Ars, "We have a general idea, but I’m reluctant to say exactly what that is."

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