Ed Gibson finally got the big solar flare he hoped for...an X-rated one? We want to learn more #Skylab50 #SkylabOTD

With the mission slowly inching towards the end, the crew was in high hopes for a solar spectacular. With some ribbing. #Skylab50 #SkylabOTD

Fun and games with the Robert Crippen Show, plus the mystery of Ed Gibson's bedroom. #Skylab50 #SkylabOTD

With a Marine, an Air Force officer, and a civilian onboard (Plus naval aviator Crippen on the radio) , interservice rivalry could take fun turns. #Skylab50 #SkylabOTD

S4's Ed Gibson wrote a textbook about the Sun before he flew to space to study it from that unique viewpoint - and seems like he got a review! We also have a link for you to the book: https://t.co/ThWZ9PUfrj #Skylab50 #SkylabOTD

Skylab's orbit varied and sometimes they received more sunlight than usually, leading to...fun and games. #Skylab50 #SkylabOTD

The jokes today are officially lame. #Skylab50 #SkylabOTD

Today, the crew broke the record for longest spaceflight yet. #Skylab50 #SkylabOTD

Skylab solar observations were full of waiting, and some spectacular results - and some wonderfully bad humor. #Skylab50 #SkylabOTD

Skylab was starting to show her age, but the crew spirits were still high. #Skylab50 #SkylabOTD

So just what was Ed Gibson doing to his crewmates? Bruce McCandless and Bill Pogue are not offering the perfect answer so far. #Skylab50 #SkylabOTD

Scatological humor today from Skylab 4 and Bob Crippen. The dye markers were part of the experiment to gather fecal samples from the crew. #Skylab50 #SkylabOTD

We think Ed Gibson is that good. #Skylab50 #SkylabOTD

There's a lot of stars in heavens. Sometimes, even astronauts make mistakes. #Skylab50 #SkylabOTD

Introducing today: The Crimson Cripper! #Skylab50 #SkylabOTD

An average day's work on Skylab, summed up by the crew. #Skylab50 #SkylabOTD

I bet nobody knew how long that status would persist. Interesting news from 1974 as read up to Skylab. #Skylab50 #SkylabOTD

Well, we sure would love to see those photos! #Skylab50 #SkylabOTD

Musical wakeup to the crew this morning. #Skylab50 #SkylabOTD

OTD, the crew surpassed a spaceflight record, and got some good feedback from their boss, Deke Slayton. #Skylab50 #SkylabOTD