This robotic arm, moving along a 33-m-long track, forms ESA’s GNC Rendezvous, Approach and Landing Simulator, used to simulate close approach to targets such as drifting satellites or asteroids.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/imagearmoutt.jpg)
Source:
https://phys.org/news/2020-06-image-arm-asteroid.html