The Space Flyer Unit (SFU) was a Japanese experimental satellite launched in 1995. It was designed to test various technologies for future space missions, including satellite servicing and autonomous operations. The SFU was equipped with a robotic arm and could perform tasks like capturing and releasing payloads in orbit. The SFU was part of the Japanese Aerospace Exploration Agency (JAXA) efforts to advance space technology. It operated in low Earth orbit and provided valuable data for the development of future satellites and space systems. The mission concluded in 1999, contributing to the understanding of satellite operations in space.