Commander Steve Hagen had been one of their instructors, but the rest of the crew—pilot Hank Redmond and mission specialists John Griffin, Lydia Danes, and Vanessa Ford—are the people Joan’s come up with, trained with, learned how to do this job alongside.

They are more than just her friends; some of them are her family. And her complicated histories with each of them are part of what is going to make her the exact CAPCOM they need today, but also the very last person who should have to do the job.

The shuttle’s mission is to launch the Arch-6, an Earth observation satellite for the U.S. Navy. However, yesterday, on day two of the flight, as the team prepared to deploy the Arch-6, the payload retention latches would not release.

This morning, they have been preparing Vanessa Ford and John Griffin for a spacewalk, so they can go into the payload bay and release the latches manually.

Joan joins the team in the flight control center. She waves good morning to Ray Stone, the flight surgeon, and nods at Greg Ullman, also known as EECOM—electrical, environmental, and consumables management.

The previous CAPCOM, Isaac Williams, reads her in, updating her on the telemetry and timeline. Ford and Griff are in their space suits. Their pre-breathe will be completed in six minutes.

Isaac leaves, and Joan takes her place at the console.

Jack gets on the flight loop—as do Joan, Ray, Greg, and the rest of the Orion Flight Team, which is made up of twenty members, each at their own stations on the floor, with a team of people in other rooms supporting them.

Ford and Griff complete the pre-breathe and get into the airlock, waiting for it to complete depressurization so that they can be ready to function within space.

The flight deck and the mid-deck—where the astronauts live and work on the shuttle—are pressurized to mimic the atmosphere on Earth’s surface. But the payload bay—where the satellites are held until they are deployed—is not. It is exposed to the vacuum of space. Which means if Ford and Griff were to enter it without their space suits, all of the oxygen would be sucked out of their lungs and bloodstream instantly, causing them to pass out within fifteen seconds and be dead within two minutes.

The human body—intelligent as it is—was formed in response to the atmosphere of Earth.

It would be easy to make the case that humans are ill-equipped to be in space. Whatever led to our design, it was not meant for this. But Joan sees it as the exact opposite.

Human intelligence and curiosity, our persistence and resilience, our capacity for long-term planning, and our ability to collaborate have led the human race here.