Skylab

Skylab was the first American space station, 118 feet long, orbiting about 270 miles above the Earth's surface. It served as an orbital laboratory where astronauts conducted various Earth and Sun observations, with the first crew staying for 28 days, and a second staying for 60, a third for 84.
 (NASA) United States 1973 Skylab

Skylab was the first American space station, 118 feet long, orbiting about 270 miles above the Earth's surface. It served as an orbital laboratory where astronauts conducted various Earth and Sun observations, with the first crew staying for 28 days, and a second staying for 60, a third for 84.