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HeadlineROBOTICS

Space Autonomous Assembly Robot SpaceBuilder Prototype Completes Zero-Gravity Testing: In-Orbit Assembly of Solar Panel Arrays

NASA and Astrobotic's SpaceBuilder robot completed autonomous assembly testing in zero-gravity outside the International Space Station, successfully assembling a 2-square-meter solar panel array.

Space Autonomous Assembly Robot SpaceBuilder Prototype Completes Zero-Gravity Testing: In-Orbit Assembly of Solar Panel Arrays

On January 9, 2031, NASA and its commercial partner Astrobotic jointly announced that the SpaceBuilder space autonomous assembly robot successfully completed its first in-orbit assembly test in the zero-gravity environment outside the International Space Station. The robot autonomously assembled a 2-square-meter solar panel array in 4 hours, with all connection points achieving precision within 0.5 millimeters.

SpaceBuilder is equipped with a six-degree-of-freedom robotic arm and a multi-modal perception system including lidar, stereo cameras, and force/torque sensors. In zero-gravity, the robot's control algorithms must compensate for Newton's third law — every grasping and placement action generates a reaction force that affects the robot's posture.

"Screwing bolts in space is completely different from doing it on Earth," explained Jason Schoolcraft, CTO of Astrobotic. "You need one hand to secure the workpiece, another to operate the tool, while simultaneously managing your own reaction forces. SpaceBuilder's control system can handle these coupled dynamics in real time."

SpaceBuilder is designed to assemble large-scale space structures in orbit, such as kilometer-scale antenna arrays for space-based solar power stations and large heat dissipation panels for deep space probes. Traditional methods require structures to be folded inside rocket fairings for launch and deployed in space, but are limited by the rocket's diameter.

Jim Reuter, Associate Administrator of NASA's Space Technology Mission Directorate, said: "SpaceBuilder represents a critical leap in the technological maturity of in-orbit assembly, from laboratory verification to engineering application. We plan to conduct the first full-scale in-orbit assembly mission in 2032."

However, SpaceBuilder's operational speed is still relatively slow — assembling 2 square meters of solar panels took 4 hours. Astrobotic says it is training the robot's operational skills through reinforcement learning, with a goal of increasing assembly speed by 10x.