The American Apollo spacecraft as seen in earth orbit from the Soviet Soyuz spacecraft during the joint U.S.-USSR Apollo Soyuz Test Project mission. The Command/Service Module and Docking Module are contrasted against a black-sky background. This picture was furnished by the USSR in an exchange of photography taken during the ASTP flight. The bell-shaped engine nozzle of the service propulsion system protrudes from the rear of the Service Module. Note the docking mechanism on the Docking Module.