The Columbus Man-Tended Free Flyer (MTFF) was a European Space Agency (ESA) program to develop a space station that could be used for a variety of microgravity experiments while serving ESA's needs for an autonomous manned space platform. It consisted of a Columbus module docked to a service module containing solar power collectors, communications and other services. The program ran from 1986 to 1991, was expected to cost $3.56 billion including launch and utilization, and was cancelled while still in the planning stage. Aspects of the program were later realised in the Columbus science laboratory attached to the International Space Station (ISS).