The Space Shuttle wasn’t just a tool for ferrying around astronauts, satellites, space probes, and supplies. It was also a unique opportunity for doing science in space. Toward that end, NASA and the European Space Agency (ESA), in the 1980s, committed to developing a mobile laboratory, Spacelab, that could function inside the Space Shuttle. Spacelab provided a platform for collaboration between the United States and Europe, considering the first entire laboratory module was provided by ESA, as were later components. Astronauts from several different countries eventually conducted research and experiments within Spacelab.