Courtesy of NASA's National Space Science Data Center . ... The Lunar Orbiter 4 spacecraft was designed primarily to photograph smooth areas of the lunar surface for selection and verification of safe landing sites for the Surveyor and Apollo missions. ... This experiment consisted of a dual-lens camera system designed to satisfy the primary mission objective of providing photogaphic information for mapping and for the evaluation of Apollo and Surveyor landing sites. ...

... Mass . ... Following several successful moon landings,NASA decided to use its last Saturn V not to fly to the moon but to place in low Earth orbit a large space station, named Skylab. ... It was followed that year by three manned flights using the smaller Saturn IB, each carrying 3 astronauts for a prolonged stay aboard Skylab. ... Mass measurements aboard Skylab were part of the medical experiments conducted there. ... Measuring body mass in the M172 chair (see illustration) was not a simple matter...

... Launch Date/Time: 1959-10-04 at 02:24:00 UTC . ... Luna 3, an automatic interplanetary station, was equipped with radio communication and telemetering systems, a television system with an automatic film processing unit, a set of scientific instruments, systems for orientation relative to the sun and moon, solar cells for electric power supply, and a temperature control system. This spacecraft was controlled by radio command from Earth. ...