On May 21, 2026, the ETH Focus Project ORBIT Robotics introduced Helios, a humanoid robot designed for future space missions. Unlike traditional humanoid robots like Tesla's Optimus, Helios boasts four arms instead of legs, which enhances its functionality in microgravity environments. In space, legs are ineffective for navigation, making arms more advantageous for performing tasks. Helios aims to assist astronauts by streamlining labor-intensive tasks such as cargo unloading and inventory management, which currently consume 35% of crew time and cost around $140,000 USD per hour for each astronaut. The robot's innovative design incorporates a tendon-driven mechanism for its arms, positioning motors near the shoulders and utilizing cables for movement, resulting in a lighter and more agile structure. Furthermore, Helios features a rolling contact joint at the elbow, enabling a balance of strength and gentle control, ideal for various operational tasks in the challenging environment of space.