What was the first space station owned and operated by NASA?

Skylab was the first space station launched and operated by NASA, occupied for about 24 weeks between May 1973 and February 1974; it was the only space station that the United States has operated exclusively. It fell back to Earth amid worldwide media attention in 1979. Skylab included a workshop, a solar observatory, and several hundred life science and physical science experiments.

Skylab included the Apollo Telescope Mount (a multi-spectral solar observatory), a multiple docking adapter with two docking ports, an airlock module with extravehicular activity (EVA) hatches, and the orbital workshop, the main habitable space inside Skylab. Electrical power came from solar arrays and fuel cells in the docked Apollo CSM. The rear of the station included a large waste tank, propellant tanks for maneuvering jets, and a heat radiator. Astronauts conducted numerous experiments aboard Skylab during its operational life.