Saturn INT-21

Short answer
Saturn INT-21 was a two-stage version of Saturn V. NASA used it once to launch Skylab, the first American space station.
- Status
- retired
- Manufacturer
- National Aeronautics and Space Administration
- Height
- 80.00 m
- Diameter
- 10.00 m
- Mass
- 2200000 kg
- Payload to LEO
- 77000 kg
- Stages
- 2