The Window Observational Research Facility (WORF) is an experiment rack facility manufactured by the Brazilian Space Agency, which remotely operated payloads and crew members can perform Earth and space science research, including hand held photography, at the U.S. Laboratory Science Window on the International Space Station. WORF is based on an International Standard Payload Rack (ISPR) and utilizes avionics and hardware adapted from the EXPRESS Rack program. The rack provides a payload volume equivalent to 0.8 m3 (28 cu ft), and will be able to support up to three payloads simultaneously, depending on available resources and space available at the window. The WORF will also provide access and equipment for crew Earth observations, such as crew restraints, camera/camcorder brackets, and condensation prevention. WORF payloads include those focusing on geology, agriculture, ranching, environmental and coastal changes, and education.

The Brazilian Space Agency is the civilian authority in Brazil responsible for the country's space program. It operates a spaceport at Alcântara, and a rocket launch site at Barreira do Inferno. It is the largest and most prominent space agency in Latin America.