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Deep diveROBOTICS

Humanoid Space Repair Robot OrbitHand In-Depth: Independently Completing Solar Panel Replacement During Spacewalk Outside the ISS

NASA and Boston Dynamics' OrbitHand humanoid robot completed the first uncrewed spacewalk outside the ISS, autonomously replacing a damaged solar panel during a 6-hour EVA.

A Robot's First Spacewalk

On June 25, 2029, a historic event occurred outside the International Space Station: a humanoid robot independently completed a 6-hour spacewalk (EVA), replacing a solar panel damaged by micrometeorite impact. Named OrbitHand, the robot was co-developed by NASA and Boston Dynamics — the first humanoid robot to independently perform complex repair tasks in a real space environment.

OrbitHand stands 1.85 meters tall, weighs 120 kilograms, and resembles a human wearing a spacesuit. Its design philosophy: "If the space station was built for humans, a human-like robot is best suited to use it." OrbitHand can directly operate handrails, tools, and interfaces designed for human astronauts without additional adapters.

Boston Dynamics developed specialized space motion control algorithms for OrbitHand. On Earth, Atlas's backflips are impressive, but in zero and microgravity, motion control faces entirely different challenges — every action produces an equal and opposite reaction, and without proper control the robot drifts away from the work area. OrbitHand moves along the station exterior by alternating hand grips on handrails, with AI calculating force and direction for every step.

"The most tense moment was removing the old solar panel," said NASA robotics project manager Julie Kramer White. "A solar panel is 12 meters long and 4 meters wide — in microgravity, its inertia could throw the robot away. OrbitHand needed to precisely coordinate 12 joints to operate safely."

An unexpected moment occurred during installation: a mounting bolt seized due to thermal expansion. OrbitHand's AI autonomously decided to use a backup tool (a heat gun) to warm the bolt for 20 seconds before successfully removing it — a decision not in the preset program but generated by the AI in response to the situation.

OrbitHand's success has sparked discussion about the space labor structure. International Association of Astronauts president and former NASA astronaut Terry Virts said: "Robots won't replace astronauts, but they can let astronauts focus on science experiments rather than repair labor. That's the right division of work."