The Greatest "Return" in Human History

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 — but 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. It is a sweeping vision to expand human activity beyond Earth.

The United States and NASA are leading this charge. The development of the massive SLS rocket, the design of the Orion spacecraft, and the procurement of lunar landers through commercial partnerships — all of it is powered by American technological capability, financial investment, and the sheer 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 be that as it may —

On April 2, 2026, at 7:35 AM Japan time, an SLS rocket lifted off from Kennedy Space Center, launching the Artemis II mission. Four astronauts aboard the Orion spacecraft are now headed toward the Moon — the first crewed flight to lunar vicinity in 53 years, since Apollo 17 in 1972. The crew includes the first woman and first Black astronaut to reach the Moon's neighborhood, making this mission a milestone in more ways than one.

Where the Plan Stands Now

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

Artemis II (April 2026) — Successfully launched today. Four astronauts will fly past the Moon on an approximately 10-day mission to verify 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.

In March 2026, NASA also announced the suspension of the Lunar Gateway orbital station and unveiled the "Ignition" plan — a phased strategy to build a permanent Moon base near the lunar south pole by 2030. Phase 1 (through 2029) focuses on foundational infrastructure, Phase 2 (2029–2032) establishes early habitation, and Phase 3 (2032–2036) aims for a permanently inhabited outpost.

Japan's Contributions — What and How

So what products and technologies is Japan bringing to this grand endeavor?

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 features a pressurized cabin where astronauts can live and work in regular clothing — essentially 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 vehicle measures 6.6m long × 4.8m wide × 5.1m tall and runs on six independently driven in-wheel motors. In May 2025, Toyota posted openings for 21 positions to significantly 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 the 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 — including 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. Operating in vacuum, with temperature swings of 290°C, and on fine lunar dust called regolith, conventional tire design simply doesn't work. 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 extending measurement and control technologies honed in extreme environments on Earth — polar regions and the deep sea — to the ultimate extreme: outer space.

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. With darkness lasting roughly 14 days on the Moon, durable and reliable illumination is critical for safe exploration operations.

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, as well as for the PPE (Power and Propulsion Element) built by Maxar. The PPE is being redirected to a Mars-oriented nuclear propulsion demonstration mission called Space Reactor-1 Freedom, though the fate of the battery cells has yet to be formally announced.

Both technologies have high potential for application in lunar surface base life support and energy systems, and may be integrated into the program in new forms.

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. On the other hand, the demand for cargo delivery to a lunar surface base is expected to grow significantly, potentially expanding the role of Japan's resupply expertise.

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.

In Closing

The Artemis program is unquestionably one of the most ambitious projects in human history. The vision of building a permanent outpost on the Moon and opening the road to Mars is a challenge that transcends national borders.

Within this endeavor, Japan's role is not building the flashy centerpieces — the rockets or the landers — but providing the technologies that keep people alive, moving, and working on the Moon. Toyota's mobile habitat, MHI's energy cycling and life support, Bridgestone's lunar traction, Yokogawa's measurement and control systems, Koito's lighting — all are technologies that sustain human life and activity, quietly and indispensably.

With the successful launch of Artemis II today, humanity's return to the Moon has taken another step from dream to reality. It will be fascinating to watch the role Japanese technology plays as this grand story unfolds.

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