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Skylab: NASA Commemorates 40th Anniversary of America's First Space Station - Photo Gallery/Broadcast - Universe Today
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Our SpaceFlight Heritage: Skylab-4 rises and closes out U.S.' first space station - SpaceFlight Insider
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File:Artist's concept of Skylab 4 astronauts observing Comet Kohoutek (S73-37274).jpg - Wikimedia Commons
![Con Stoitsis on Twitter: "On this day in 1973 Comet Kohoutek-Skylab became the first comet photographed from space. NASA picture. https://t.co/B7matE7tOT" / Twitter Con Stoitsis on Twitter: "On this day in 1973 Comet Kohoutek-Skylab became the first comet photographed from space. NASA picture. https://t.co/B7matE7tOT" / Twitter](https://pbs.twimg.com/media/DSUZRYNVAAE8scn.jpg)