NASA just gave us our best look yet at its Artemis III moon-lander test flight.The agency laid out a detailed concept of operations for Artemis III today (Oct. 23) during a press conference at Kennedy Space Center, stressing how important the flight is to its moon plans and how challenging it will be to make everything go right."We're launching three of the most powerful rockets in the world, and undertaking what is likely the most complicated launch campaign ever undertaken," Jeremy Parsons, NASA’s Artemis program manager, said during today's event, which lasted more than two hours. The baseline concept of operations for NASA's Artemis III docking test in low Earth orbit. (Image credit: NASA)Those three rockets are NASA's Space Launch System (SLS), SpaceX's Starship and Blue Origin's New Glenn, all of which will fly from Florida's Space Coast.If all goes according to plan, New Glenn will lift off first, carrying Blue Origin's Blue Moon lunar lander to low Earth orbit (LEO). SLS will go next, launching the Artemis III astronauts — NASA's Randy Bresnik, Andre Douglas and Frank Rubio, and the European Space Agency's Luca Parmitano — aboard NASA's Orion spacecraft.SLS will deploy Orion into a highly elliptical orbit, one that gets as close to Earth as 18 miles (29 kilometers) and as far away as 1,122 miles (1,806 km), according to Parsons. The capsule will then maneuver itself into an orbit with an altitude of about 345 miles (555 km)."That's really about getting thermal stability," Parsons said. "Orion was built as a deep-space vehicle, and so we're going to have to really manage the thermal environments, which are higher in a low Earth orbit."The Artemis III crew will spend two days checking out Orion and its systems in LEO before meeting up with Blue Moon, which will take place on Flight Day 3 at an altitude of 273 miles (439 km). "Over the next two days, the crew will conduct operations docked with Blue Moon," Parsons said. "They're going to open up the hatch. They're going to enter the lander. They're going to evaluate the environmental controls, the life support systems. We'll confirm that the spacecraft can maintain the right atmospheric pressure, and we're also going to test emergency scenarios, dual vehicle control, and we're going to put our Mission Control teams through their paces."After those operations are complete — likely on Flight Day 6 or thereabouts — Starship will launch, with a specially built docking adapter on its nose.The SpaceX vehicle — the 171-foot-tall (52 meters) upper stage of its fully reusable Starship megarocket — will meet up with Orion in LEO on Flight Day 8, at an altitude of about 237 miles (381 km). But this will be a very different encounter than the rendezvous with Blue Moon."The demonstration with Starship is shorter, about two hours," Parsons said. "The crew will not enter the Starship during the mission, but it gives us critical data and allows us to really understand the forces of docking, how we're going to push, how we're going to work together."Artemis III will continue for another six to nine days after Orion undocks from Starship before finally heading back down to Earth for a parachute-aided ocean splashdown. (The nominal mission length is 14 days, Parsons said, but it could last as long as 17 days.) During that time, the crew will evaluate their survival suits — something that didn't get done during the 10-day Artemis II flight around the moon this past April — and do a variety of other work as well, from detailed health assessments to scientific experiments and technology demonstrations. The main goal is to keep everything on track for Artemis IV, which will land astronauts near the moon's south pole in 2028, if all goes to plan."Everything we do on Artemis III is designed to reduce risk for our future lunar landing missions," Parsons said. "We're teaching these teams how to work together, how to make critical real-time mission decisions, all in an environment that is low Earth orbit, where if something goes wrong, we can come home much more quickly."It's unclear at the moment which of these two privately developed landers — Blue Moon or Starship — will fly on Artemis IV, pulling off the first crewed lunar touchdown since Apollo 17 in 1972. NASA is still preserving optionality, "to give both of our lunar landing partners the greatest opportunity for readiness in advance of astronauts landing on the moon in 2028," NASA Administrator Jared Isaacman said during today's event."We have no intention of surrendering a viable path to the surface before the data and schedule compels us to do so," he added.No matter what decision NASA makes for Artemis IV, both Blue Moon and Starship should hit the gray dirt relatively soon, according to Parsons. "Regardless of who goes first, both providers are planning for lunar landing missions in 2028," he said.And those missions will be quite different from each other. For example, on Blue Origin touchdowns, Orion will meet up with Blue Moon in lunar orbit. On SpaceX landings, however, Starship will likely dock with the NASA capsule in Earth orbit and propel it to the moon, Parsons said — the "push" he referred to above. It remains unclear when exactly Artemis III will launch. NASA is targeting the summer of next year but may find it tough to meet that timeline: Last month, in an internal memo, Isaacman told agency employees that Artemis III was about 90 days behind schedule. Some of the biggest challenges have involved the supply chain for the mission's lunar landers, Parsons said during today's event. But he and Isaacman both stressed that NASA is confident in its ability to work through such issues."We're moving with real speed and purpose right now," Isaacman said.