testedapollo soyuz test projectastpapollo soyuzapas-75smithsoniannational air and space museumudvar-hazy centeradam savageapollo programsoviet space programcold war space racespacecraft docking mechanismandrogynous peripheral assembly systemspace historyspace explorationspacecraft conservationmuseum artifact restorationnasa soyuz dockingaerospace engineeringadam savage smithsonianadam savage air and spaceadam savage nasm