A robot has successfully assembled a construction in Earth’s orbit without human intervention, marking a potential shift in how large-scale infrastructure is built in space.
The experiment, known as ASTRA, demonstrated that a machine could autonomously retrieve components from storage and assemble them into a lattice girder, according to reporting by oe24.at.
The ASTRA project was developed by researchers at the California Institute of Technology (Caltech) in collaboration with the U.S. research agency DARPA. The equipment was launched on March 30, 2026, aboard the SpaceX Transporter-16 mission, occupying roughly one cubic meter of space during transit.
Once in low Earth orbit, the robotic arm moved components into place and attached a thin, perforated film designed to serve as a reflector. While the system proved that autonomous orbital assembly is possible, the mission faced technical hurdles. The team dealt with limited communication windows, receiving only about 15 minutes of contact with the satellite seven to eight times per day.
To manage technical disruptions, the researchers used a duplicate model in a Caltech laboratory to simulate issues and develop new commands. Although these constraints prevented the team from completing the originally planned 1.4-meter antenna, the core objective was achieved. "That is the first time that a structure has been autonomously constructed in space," project leader Sergio Pellegrino of Caltech stated.
The success of the ASTRA experiment supports the broader goals of DARPA’s NOM4D program, which aims to enable the construction of space-based structures ranging from hundreds of meters to several kilometers in length.
The mission was designed to test whether a robot could autonomously assemble a structural framework in space without human assistance. This capability is intended to facilitate the construction of large-scale space assets that are too bulky to launch from Earth in one piece.
Because the robot had limited communication windows with Earth, researchers relied on a ground-based replica at Caltech. They used this identical model to diagnose malfunctions and verify new software commands before transmitting them to the orbiting hardware.
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