Skylab was the United States' first space station and a major step from short spaceflights toward living and working in orbit. Launched in 1973, it was built from the upper stage of a Saturn V rocket, called the S-IVB. Skylab showed that astronauts could repair spacecraft, perform long science missions, and study Earth and the Sun from space.
Its story matters because many ideas used on later stations were tested there first.
Skylab was damaged during launch when a micrometeoroid shield tore away and one solar array was lost. Astronaut crews repaired the station by installing a sunshade and freeing a stuck solar array, which restored power and reduced overheating. Inside the orbital workshop, crews performed experiments in human biology, materials science, astronomy, and Earth observation.
The Apollo Telescope Mount gave scientists valuable solar data, including observations of flares and the Sun's outer atmosphere.
Key Facts
- Skylab launched on May 14, 1973, using a Saturn V rocket.
- Skylab was made from a Saturn V S-IVB upper stage converted into an orbital workshop.
- Three crews lived aboard Skylab: Skylab 2, Skylab 3, and Skylab 4.
- The longest Skylab mission lasted about 84 days, setting a major endurance record at the time.
- Orbital speed near low Earth orbit is about v = sqrt(GM/r), which is roughly 7.7 km/s for Skylab.
- Skylab reentered Earth's atmosphere on July 11, 1979, after its orbit decayed.
Vocabulary
- Skylab
- Skylab was the first United States space station, used for long-duration astronaut missions and scientific research in low Earth orbit.
- S-IVB
- The S-IVB was the third stage of the Saturn V rocket and served as the structure converted into Skylab's main workshop.
- Apollo Telescope Mount
- The Apollo Telescope Mount was Skylab's solar observatory system used to study the Sun in several wavelengths of light.
- Docking Adapter
- A docking adapter is the spacecraft structure that allows a visiting Apollo command and service module to connect safely to Skylab.
- Orbital Decay
- Orbital decay is the gradual lowering of a spacecraft's orbit due to drag from the thin upper atmosphere.
Common Mistakes to Avoid
- Calling Skylab a Moon mission is wrong because Skylab stayed in low Earth orbit and was not designed to travel to the Moon.
- Assuming Skylab worked perfectly after launch is wrong because launch damage caused overheating and power problems that astronauts had to repair.
- Confusing the Apollo Telescope Mount with a docking port is wrong because the telescope mount was mainly a solar observatory, while docking happened through the docking adapter.
- Ignoring atmospheric drag in low Earth orbit is wrong because even thin air can slowly reduce orbital altitude and eventually cause reentry.
Practice Questions
- 1 Skylab's orbital speed was about 7.7 km/s. How far would it travel in 10 minutes, assuming constant speed?
- 2 The longest Skylab mission lasted about 84 days. Convert this time into hours, then into minutes.
- 3 Explain why repairing the sunshade and solar array was essential for Skylab's crew safety and scientific mission success.