NASA has begun trials of a new orbital refueling system for spacecraft. In the future, this technology could become a key enabler for missions to the Moon, Mars, and other destinations in the Solar System.
The core of the innovation is a cryogenic coupling node developed by L3Harris. Essentially, it functions as an automatic fuelling nozzle for space: it links a spacecraft to an orbital fuel station and facilitates the transfer of liquid hydrogen and liquid oxygen.
Travis Belcher, the project lead at the Marshall Space Flight Center, noted that no one has ever conducted fully autonomous cryogenic refuelling between two spacecraft before. This challenge is considered among the most complex in modern spaceflight.
The primary advantage of the new system is its ability to repeatedly connect and disconnect the fuel interface without requiring astronaut intervention. At the same time, the mechanism can tolerate minor docking inaccuracies: the design allows for a slight misalignment of the connecting components.
During the initial test phase, engineers employed liquid nitrogen at approximately -196 °C. They repeatedly connected and disconnected the node, evaluating its leak-tightness, reliability, and resistance to extreme cold. Additionally, specialists deliberately simulated imperfect docking to verify the system remains functional under realistic conditions.
For now, the technology remains in early development. Going forward, NASA plans to adapt it for specific space missions, including the Lunar exploration program and future expeditions to Mars.
The agency believes that orbital refuelling could fundamentally transform the approach to deep-space travel. If spacecraft can replenish their fuel supplies while already in orbit, they will not need to launch all the required propellant from Earth, which would enable the construction of larger, more long-range vehicles.
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