A Return, Half a Century Later

The Artemis program is the story of humanity going back to the Moon.

In 1969, when Apollo 11 touched down on the lunar surface, the entire world held its breath. More than half a century later, NASA has decided to return, and this time the goal isn't just to visit and come back. Artemis aims to establish a permanent presence on the Moon and pave the way to Mars, expanding where humans can live and work beyond Earth.

The United States and NASA are leading this charge. The development of the massive SLS rocket, the design of the Orion spacecraft, the procurement of lunar landers through commercial partnerships: all of it rests on American engineering, American money, and the will to send humans back to the Moon. In 2020, the Artemis Accords were signed by eight founding nations, and the partnership has since grown to include over 50 countries. It was American leadership that built this framework and brought the world together.

On a personal note, it's hard not to feel a twinge of disappointment at the recent conduct, on the international stage, of a nation great enough to spearhead such a magnificent project for all of humanity. But back to the Moon.

On April 2, 2026, at 7:35 AM Japan time, an SLS rocket lifted off from Kennedy Space Center, launching the Artemis II mission. Orion carried four astronauts around the far side of the Moon on April 6 (US Eastern time) and splashed down in the Pacific on April 10, completing the first crewed flight to lunar vicinity in 53 years, since Apollo 17 in 1972. Commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch, and Jeremy Hansen of the Canadian Space Agency made up the crew, which included the first woman, the first Black astronaut, and the first non-American to reach the Moon's neighborhood.

Where the Plan Stands Now

After adjustments to budgets and schedules, the current Artemis roadmap is as follows:

Artemis II (April 2026): Complete. Four astronauts flew past the Moon on a roughly 10-day mission that verified crewed operations. No lunar landing.

Artemis III (mid-2027): An integrated demonstration mission in low Earth orbit, testing docking between Orion and a lunar lander, spacewalk suit verification, and other systems. The originally planned Moon landing has been removed from this mission.

Artemis IV (2028): The first crewed lunar landing under the current plan. The mission architecture has been changed from a Gateway-based approach to a direct-to-surface profile.

Artemis V and beyond: Targeting at least one landing per year, with ambitions to eventually increase to semi-annual missions.

On March 24, 2026, NASA Administrator Jared Isaacman used a presentation titled "Ignition" to announce that the Lunar Gateway would be paused in its current form. In its place comes a permanent base near the lunar south pole, built in three phases: Phase 1 (through 2028, robotic scouting and foundational infrastructure), Phase 2 (2029–2032, early habitation), and Phase 3 (2033–2036, a permanent outpost with long-duration stays). NASA put the cost of the initial elements at roughly $20 billion.

What Japan Actually Supplies

So what products and technologies is Japan bringing to the program?

Artemis I: Small Satellite Technology

Two JAXA CubeSats hitched a ride on the uncrewed Artemis I test flight in 2022.

OMOTENASHI was designed to demonstrate lunar landing technology on a CubeSat scale. While it didn't achieve its primary objectives after failing to acquire sun-pointing following separation, it provided valuable data on operating micro-satellites in deep space. EQUULEUS, jointly developed by the University of Tokyo and JAXA, achieved the world's first orbital maneuver using water-based propulsion after a lunar flyby.

At this stage, Japan's involvement centered on university and JAXA research institutions rather than major corporate hardware.

Lunar Cruiser: Japan's First Independent Crewed Space Vehicle

Japan's largest contribution to Artemis will arrive on the Moon from 2031 onward: the pressurized lunar rover known as the "Lunar Cruiser." Unlike the open-top rovers of the Apollo era, the Lunar Cruiser has a pressurized cabin where astronauts can live and work in regular clothing, effectively a mobile Moon base. Two crew members can operate for up to 30 days, and the vehicle can be remotely operated as an uncrewed rover between manned missions.

NASA's Ignition plan explicitly includes JAXA's pressurized rover as a key element of Phase 2 (2029–2032) for the lunar surface base.

Multiple Japanese companies are contributing their specialized technologies to this development:

Toyota Motor Corporation has been conducting joint research with JAXA since 2019 and leads vehicle development. Drawing on the reliability, durability, and off-road capability refined through the Land Cruiser lineage, Toyota is equipping the Lunar Cruiser with an advanced version of the fuel cell technology used in the MIRAI. The concept presented to Japan's MEXT space policy subcommittee describes a vehicle roughly 6.3 m long, 4.7 m wide and 4.9 m tall, weighing about 15 tonnes, with six wheels driven by in-wheel motors. In May 2025, Toyota posted openings across 21 job categories to expand the development team.

Mitsubishi Heavy Industries (MHI) is developing the Regenerative Fuel Cell (RFC) system. While a conventional fuel cell generates electricity and water from hydrogen and oxygen, the RFC takes it a step further, using solar energy to electrolyze that water back into hydrogen and oxygen. This closed-loop energy cycle is essential for surviving the Moon's roughly 14-day-long nights. MHI is also applying expertise from the Environmental Control and Life Support System (ECLSS) originally developed for the now-suspended Gateway, covering atmospheric pressure control, oxygen supply, CO₂ removal and trace contaminant removal, to the Lunar Cruiser's life support systems.

Bridgestone is responsible for developing lunar tires. Vacuum, a 290°C temperature swing, and the fine dust called regolith: none of it suits conventional tire design. Bridgestone is adapting its airless tire technology, using thin metal spokes and segmented treads to bear loads without air. Tread patterns that resist sinking into regolith are also under development.

Yokogawa Electric signed a research and development agreement with Toyota in September 2025 to work on the Lunar Cruiser's measurement and control platform, as well as battery monitoring components. The company is taking instrumentation hardened in polar regions and on the deep seabed and pointing it at the Moon.

Koito Manufacturing, a major automotive and aircraft lighting supplier, joined the project in 2025 through a contract with Toyota to develop exterior lighting for the Lunar Cruiser. Lunar night runs roughly 14 days, so the durability and reliability of the lights bear directly on crew safety.

Impact of the Gateway Suspension

The March 2026 suspension of Gateway construction affects Japanese technologies that were being developed for the station.

MHI's ECLSS was being built for Gateway's I-Hab (International Habitation Module), which remains under construction. NASA has indicated it is exploring how to repurpose existing hardware for the lunar surface base.

Mitsubishi Electric's lithium-ion batteries were being supplied for Gateway's HALO and I-Hab modules and for the PPE (Power and Propulsion Element). The PPE has now been reassigned to Space Reactor-1 Freedom, a nuclear-electric propulsion demonstrator headed for Mars and targeting a 2028 launch. What happens to the battery cells has yet to be announced.

Both transfer readily to life support and power on a surface base, so there is room for them to survive the program in altered form.

HTV-XG and Resupply Technology

JAXA has a long track record of resupply missions to the International Space Station, and is developing the next-generation cargo vehicle HTV-X with MHI. The Gateway-bound variant, HTV-XG, was planned for operation by 2030, but will likely be reconfigured following the Gateway suspension. Once base construction begins, though, demand for cargo delivery grows rather than shrinks, and Japan's resupply expertise has more, not less, to do.

Japanese Astronauts Heading to the Moon

Under a NASA-JAXA agreement, two Japanese astronaut slots for lunar surface missions have been secured, in exchange for providing the Lunar Cruiser. If realized, a Japanese astronaut could become the first non-American to set foot on the Moon. The timing is projected for 2031 or later, following the Lunar Cruiser's deployment.

Unglamorous, and Load-Bearing

Japan is not building the headline hardware, the rockets or the landers. It is building the parts that keep people alive, mobile and working once they are on the surface. Toyota's mobile habitat, MHI's energy loop and life support, Bridgestone's traction, Yokogawa's instrumentation, Koito's lighting: subtract any one and the crew's usable hours on the Moon shrink.

With Artemis II home safely, the return to the Moon moved a step closer. Next comes Artemis III in mid-2027, then the landing in 2028. And in 2031, a Japanese vehicle starts driving on the Moon.

What companies and technologies from your country are involved in space exploration? Share your thoughts in the comments!