A Chinese satellite equipped with a robotic "octopus arm" has passed a key refueling test in low Earth orbit (LEO), according to state-run media. The achievement highlights China's continued leadership with this particular technology, which NASA has not yet caught up with.

The experimental spacecraft will eventually deploy a giant balloon in LEO, which could help solve another important issue surrounding satellite "megaconstellations" like SpaceX's Starlink network.

The satellite, dubbed Hukeda-2 (also known as Yuxing-3 06 within China), launched March 16 aboard the Kuaizhou-11 rocket from Jiuquan Satellite Launch Center, according to the website of Jonathan McDowell, a now-retired astronomer at the Harvard and Smithsonian Center for Astrophysics who has been tracking the movements of Earth-orbiting spacecraft for more than two decades. It was one of eight satellites deployed during this mission, and it is now orbiting Earth at an altitude of around 335 miles (540 kilometers).

Hukeda-2 is a demonstration satellite intended to test new technologies in LEO. Its most notable attachment is an octopus-like robotic arm that "can curl, twist and wrap around objects to work in tight, complex spaces, with a nozzle-like tip at one end designed to line up and connect with a target port," according to the South China Morning Post.

The arm is made of a series of spring-like tubes threaded with cables attached to a motor, allowing it to bend in almost any direction and make the small adjustments needed to dock with another satellite while both spacecraft are traveling at speeds of around 16,800 mph (27,000 km/h).