 These Mariners carried cameras, and Mariner 4 successfully returned pictures of Mars as it flew by.The Mariner 5 was successfully launched to Venus on June 14, 1967 and flew by in October, probing Venus' atmosphere with radio waves, scanning its brightness in ultraviolet light, and sampling solar particles and magnetic field fluctuations above the planet.The Agena rocket stage was used as the passive docking target for the Gemini crewed space program.