JAXA and MHI studying next gen reusable rockets


The development of a new, large, and reusable launch vehicle marks a significant step in Japan’s ambitious space exploration endeavors. This project, undertaken collaboratively by JAXA and MHI, is a response to the evolving landscape of space exploration. As space missions become more complex and frequent, there is a growing demand for versatile and cost-effective launch systems that can adapt to a wide range of payloads and mission profiles.

The initiative, backed by Japan’s revised space policy, reflects a forward-looking vision. This vision encompasses not only achieving cost savings and improving launch efficiency but also contributing to environmental sustainability. Reusable launch vehicles hold the promise of reducing space debris and lowering the environmental impact of space exploration.

As space exploration enters an exciting phase with missions to the Moon, Mars, and beyond, Japan is positioning itself as a key player in this global endeavor. The new rocket, which builds on the advancements of the H3, aims to increase satellite capacity, making it more versatile for various mission requirements. Moreover, by incorporating reusability, Japan seeks to drive down the costs associated with space missions, making space more accessible and affordable for scientific research, commercial ventures, and international collaboration.

While the new rocket’s design and development are still in their early stages, it represents Japan’s commitment to pushing the boundaries of space exploration. The collaboration between JAXA and MHI, both renowned for their contributions to space technology, underscores Japan’s intention to remain at the forefront of space exploration and contribute to a more sustainable and efficient future for space transportation. As this project progresses, it holds the potential to open new possibilities for international cooperation in space exploration and research.

The consideration of fuel options, such as liquid methane and liquid hydrogen, for the new rocket underscores the evolving landscape of space exploration technologies. Liquid methane, in particular, has gained prominence as an environmentally friendly and cost-effective propellant choice for rocket engines. The interest in methane propulsion aligns with global trends observed in the United States and China, where both government agencies and commercial firms have been working on methane-liquid oxygen launchers.

JAXA has a goal of reducing the cost per kilogram to low Earth orbit (LEO) by about half compared to the H3 rocket reflects a broader industry objective of driving down launch costs. Achieving this cost reduction will not only make space access more affordable but will also facilitate an increase in launch frequency, accommodating a more diverse array of space missions.

While specific details about the new rocket’s design and capabilities remain in development, its intended purpose is clear: to transport cargo vehicles to lunar orbit and landers to the moon’s surface. This lunar capability is particularly significant, aligning with the global push for lunar exploration, including NASA’s Artemis program and other international lunar missions.

The new rocket, anticipated to be ready for the 2030s, presents an exciting opportunity for Japan to play a pivotal role in lunar exploration and potentially support human spaceflight endeavors in the future. By leaving space for private space companies to contribute to Japan’s space transportation capabilities, the plan promotes innovation, fostering a competitive environment and driving advancements in space technology.

As the global space sector continues to expand, these developments align Japan with the international community’s shared aspirations for scientific research, exploration, and commercial ventures in space. Collaboration and partnerships are at the heart of this vision, with both public and private entities contributing to the future of space transportation and exploration.