the space spider that assembles structures

When we say that China steps on NASA’s heels In your space race we are not kidding. It is not just about the missions to the Moon or the launch of your own space station. The Asian country has been able to recover one of NASA’s frustrated dreams: creating a robot that assembles large constructions directly in space.

A space spider. China has replicated and improved the SpiderFaba robot designed by NASA to weave structures with carbon fiber thread, directly under microgravity conditions. In very rough terms, it is a kind of spatial 3D printer that behaves like a spider. At the moment an antenna has been woven in a terrestrial laboratory, so it would be necessary to check if it is equally viable in space. However, the results have been very promising and have also overcome several of the obstacles that NASA encountered at the time.

Obstacles overcome. The idea for SpiderFab came from NASA, although the project was launched together with the company Tethers Unlimited. Although at the beginning everything seemed to be going well, during the process they encountered two obstacles so big that the project ended up being archived. These were related to the fit of the pieces in space and the resistance of the structures. Therefore, China has added some changes to the process.

For starters, they use carbon fiber composite reels, rather than pure carbon fiber. These more complex compounds are stronger, but also lighter. Ideal for spatial structures. On the other hand, the robot makes assembly joints so that the pieces can fit together without the need for screws or glue. In the most extreme cases, if necessary, fusion using laser rays could be used.

A much needed robot. In reality, the use of a robot like SpiderFab is very necessary to continue advancing in the space race. Spaceships have a load limit that cannot be exceeded, both for a simple matter of space and for the necessary investment in fuel.

With respect to space, sometimes we resort to placing the necessary structures very well folded into orbit, and then opening them at their destination or even along the way. This is precisely what was done with the mirrors of the James Webb Space Telescope. However, this is not always feasible. That is why it is so useful to resort to strategies like this robot, capable of weaving antennas or solar panels as if it were a spider manipulating silk.

Challenges still remain. At the moment, China has already gone further than NASA with its own SpiderFab. However, there are still other challenges to overcome. For example, the assembly of the robot itself must be tested in microgravity conditions. It will also be necessary to check that it adequately resists other spatial elements, such as cosmic radiation. They are on the right track, but the bells cannot yet be launched into the air. Also, thinking about it, instead of throwing the bells into the air, it would be better to weave them directly into place.

Images | Tethers Unlimited

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