Skylab was the first United States manned space station, man's boldest step toward future colonization of space. This is the very story of the threee missions, the nine astronauts and thier 171 days in the manned laboratory. Criss-crossing 70 percent of the Earth's land area. Skylab's sensors gathered information about many features on Earth. Perhaps one day mankind will be ordering a new home in space with four rooms, Earth's view.