In a science lab at Tohoku University in northern Japan, engineers have been thinking about a question that sounds almost science fiction:
What if humanity could build cities in space the same way we build bridges on Earth?
That idea sits at the heart of a young Japanese startup called Space Quarters.
And in October 2025, the company took a meaningful step toward that vision, raising $5 million in seed funding to develop autonomous robots designed to construct large structures in orbit.
It’s a small funding round by Silicon Valley standards. But the ambition behind it is enormous.
Because if the technology works, it could fundamentally change how humanity builds in space.
The problem with building beyond Earth
Right now, nearly everything in orbit is built on Earth first.
Satellites, space station modules, antennas – they’re all carefully assembled on the ground, packed inside a rocket, and launched into space.
Once there, astronauts or robotic systems unfold them like giant pieces of origami.
This method has worked for decades. But it comes with serious limitations.
Rockets are expensive, payload space is limited, and every piece of hardware must survive the brutal vibration and acceleration of launch.
That means space structures are forced to fit inside the narrow dimensions of a rocket fairing.
In other words, the size and shape of space infrastructure is determined by rockets, not by what engineers actually want to build.
For a future where humans might live, work and manufacture in orbit, that approach simply doesn’t scale.
That’s the problem Space Quarters is trying to solve.
Robots that build in space
Founded in 2022 by Japanese engineer Shogo Onishi, Space Quarters is developing a system of autonomous construction robots designed to assemble structures directly in space.
Instead of launching massive pre-built modules, rockets would carry flat panels, structural components, and robotic builders.
Once in orbit, the robots would get to work.
Panels would be moved into position by assembly robots. Welding robots would then travel along the seams, fusing metal structures together using electron beam welding, a process particularly well suited to the vacuum of space.
Inspection robots would verify the welds, pressurise the structure, and confirm its integrity.
The company calls this platform the DAIQ System, essentially a robotic construction crew designed to operate in zero gravity.
It sounds complicated. But the core idea is simple.
Ship materials to space, and build everything there.
That single change could unlock far larger and cheaper infrastructure in orbit.
Why investors are paying attention
The startup’s $5 million seed round was led by Frontier Innovations, and backed by several prominent Japanese venture firms including SMBC Venture Capital, Keio Innovation Initiative, Global Brain, XTech Ventures and Mitsubishi UFJ Capital.
The funds will help expand the engineering team and upgrade testing facilities.
They also prepare the company for its next major milestone: demonstration missions in orbit and potentially on the Moon later this decade.
It’s still early days. But the interest from investors reflects a broader shift in the global space economy.
The space sector is already valued at more than US$500 billion globally, and analysts expect it to double within the next decade.
But many of the most valuable opportunities – orbital manufacturing, satellite servicing, lunar mining, space tourism – require one crucial capability.
Infrastructure.
Space Quarters is trying to become the company that builds it.
Japan’s different approach to the space race
The company’s rise also reflects a distinct strategy in Japan’s growing space sector.
While the United States has produced headline-grabbing private giants like SpaceX and Blue Origin, Japan has taken a quieter route.
Much of its innovation comes from university spinouts and industrial partnerships, where academic research combines with corporate engineering.
Space Quarters sits squarely in that model.
The startup has already collaborated with Japan’s national space agency JAXA, as well as aerospace manufacturer IHI Aerospace, and major engineering firm Obayashi Corporation.
These partnerships are helping validate the technology through ground experiments while laying the groundwork for larger projects.
Potential future applications range from orbital research platforms to satellite repair stations, and even large antennas stretching more than 100 metres across.
And perhaps most ambitiously, lunar bases built partly from local materials like moon dust.
The engineering challenge ahead
Of course, building in space is not easy.
Welding metal structures in zero gravity requires extreme precision.
Autonomous robots must operate reliably in radiation, vacuum and temperature swings that can exceed hundreds of degrees.
Regulatory frameworks for commercial construction in orbit are also still evolving.
And like most deep tech ventures, the development cycle is long and capital intensive.
But the direction of travel is clear.
Launch costs are falling rapidly as new rockets increase payload capacity and reduce cost per kilogram.
Private space stations are already being planned. And NASA’s Artemis program aims to establish a long term human presence on the Moon.
The space race was never only about getting there first.
The real challenge was always figuring out how to build once we arrived.
This article is not financial advice. Always do your own research or speak with a licensed adviser before making investment decisions
Read another story: Why Japan’s chip comeback puts Rapidus in the investor spotlight
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