Part of the "Planet Earth" film series, this film "[t]races the development of space research; explains the need for satellites, rockets, and other space probes; demonstrates how such tools operate, shows how their findings are reported, and discusses what they have contributed to man's knowledge of space and of the solar system. Includes actual scenes of the assembly of instruments, the launching of satellites, and of the operation of tracking stations and computer centers."--Summary from WorldCat