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50 Years Ago: Skylab 4 Astronauts Push Past the One-Month Mark


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In December 1973, Skylab 4 astronauts Gerald P. Carr, Edward G. Gibson, and William R. Pogue passed the one-month mark of the third and final mission aboard the Skylab space station. Launching on Nov. 16, they began a planned 56-day flight that mission managers fully expected to extend to 84 days. They continued the science program begun by the previous two Skylab crews, including biomedical studies on the effects of long-duration space flight on the human body, Earth observations using the Earth Resources Experiment Package (EREP), and solar observations with instruments mounted on the Apollo Telescope Mount (ATM). To study newly discovered Comet Kohoutek, scientists added cometary observations to the crew’s already busy schedule, including adding a far ultraviolet camera to Skylab’s instrument suite.

Image of a massive solar flare taken by one of the Apollo Telescope Mount instruments Earth Resources Experiment Package infrared photograph of Florida’s central Atlantic coast including NASA’s Kennedy Space Center Gerald P. Carr monitors Edward G. Gibson during a lower body negative pressure test of his cardiovascular system
Left: Image of a massive solar flare taken by one of the Apollo Telescope Mount instruments. Middle: Earth Resources Experiment Package infrared photograph of Florida’s central Atlantic coast including NASA’s Kennedy Space Center. Right: Gerald P. Carr monitors Edward G. Gibson during a lower body negative pressure test of his cardiovascular system.

On Dec. 13, the mission’s 28th day, program officials assessed the astronauts’ performance and the status of the station and fully expected that they could complete the nominal 56-day mission and most likely the full 84 days. Despite being overworked and often behind the timeline, Carr, Gibson, and Pogue had already accomplished 84 hours of ATM solar observations, 12 EREP passes, 80 photographic and visual Earth observations, all of the scheduled medical experiments, as well as numerous other activities such as student experiments, and science demonstrations. The astronaut’s major concern centered around the timelining process that had not given them time to adjust to their new environment and did not consider their on-orbit daily routine. Despite the crew sending taped verbal messages to the ground asking for help in fixing these issues, the problem persisted. Skylab 4 Lead Flight Director Neil B. Hutchinson later admitted that the ground team learned many lessons about timelining long duration missions during the first few weeks of Skylab 4.

Soyuz 13 cosmonauts Pyotr I. Klimuk, left, and Valentin V. Lebedev during their mission Model of Soyuz 13, showing the replacement of the forward docking system with the Orion-2 telescope inside its housing Preflight view of the Orion-2 instrument package
Left: Soyuz 13 cosmonauts Pyotr I. Klimuk, left, and Valentin V. Lebedev during their mission. Middle:  Model of Soyuz 13, showing the replacement of the forward docking system with the Orion-2 telescope inside its housing. Right: Preflight view of the Orion-2 instrument package. Image credits: courtesy of Roscosmos.

On Dec. 18, Carr, Gibson, and Pogue received visitors in low Earth orbit. On their 33rd day aboard the Skylab space station, the Soviet Union launched Soyuz 13, with Pyotr I. Klimuk and Valentin V. Lebedev aboard. Although the event marked the first time in history that American astronauts and Soviet cosmonauts orbited the Earth at the same time, the two crews neither met nor communicated with each other, traveling in very different orbits with different missions. The Soyuz 13 cosmonauts operated a scientific package called Orion-2, comprised of three ultraviolet spectrographs for stellar observations and an X-ray telescope to image the Sun. Soviet engineers modified the orbital compartment of the Soyuz, removing its docking apparatus to accommodate the Orion-2 instruments. On Dec. 26, the cosmonauts landed in Kazakhstan in the middle of a snowstorm. The success of Soyuz 13 gave the Soviets and their American counterparts confidence that the spacecraft, modified after the Soyuz 11 accident, would be safe for the Apollo-Soyuz Test Project (ASTP), a joint mission agreed to in May 1972 and planned for July 1975.

Gerald P. Carr flying the Astronaut Maneuvering Unit A far ultraviolet image of Comet Kohoutek William R. Pogue at the controls of the Apollo Telescope Mount
Left: Gerald P. Carr flying the Astronaut Maneuvering Unit. Middle: A far ultraviolet image of Comet Kohoutek. Right: William R. Pogue at the controls of the Apollo Telescope Mount.

Carr, Gibson, and Pogue increased their focus on observing Comet Kohoutek as it neared perihelion, or its closest approach to the Sun, on Dec. 28. At that point, Skylab’s solar telescopes could observe the comet better than any ground-based instruments. In addition to dedicated observations during two spacewalks, the astronauts continued to monitor the comet well into January as it headed rapidly away from the Sun, to return in maybe 75,000 years. The astronauts continued their medical studies and Earth observations as well as tests inside the large dome of the workshop of the Astronaut Maneuvering Unit, a precursor of the Manned Maneuvering Unit used during the space shuttle program to retrieve satellites.

Skylab 4 astronauts Gerald P. Carr, left, Edward G. Gibson, and William R. Pogue build and decorate their makeshift Christmas tree Carr, left, Gibson, and Pogue’s Christmas stockings Gibson, left, Carr, and Pogue open Christmas presents
Left: Skylab 4 astronauts Gerald P. Carr, left, Edward G. Gibson, and William R. Pogue build and decorate their makeshift Christmas tree. Middle: Carr, left, Gibson, and Pogue’s Christmas stockings. Right: Gibson, left, Carr, and Pogue open Christmas presents.

For only the second time, American astronauts celebrated Christmas in space. On the first occasion five years earlier, Apollo 8 astronauts observed Christmas as the first crew to orbit the Moon. In the more spacious Skylab workshop, and with more time to prepare, Carr, Gibson, and Pogue built a makeshift Christmas tree by repurposing food cans, used colored decals as decorations, and topped it with a cardboard cutout in the shape of a comet. They hung stockings on the wall beneath the tree and sent holiday greetings to people on the ground.

Image of Skylab 4 astronaut Gerald P. Carr from the mission’s second spacewalk, changing film cassettes in the Apollo Telescope Mount (ATM) Image of Skylab 4 astronaut Gerald P. Carr from the mission’s second spacewalk, repairing one of the ATM instruments Image of Skylab 4 astronaut Gerald P. Carr from the mission’s second spacewalk, observing Comet Kohoutek.
Skylab 4 astronaut Gerald P. Carr in three scenes from the mission’s second spacewalk, with tasks including changing film cassettes in the Apollo Telescope Mount (ATM), repairing one of the ATM instruments, and observing Comet Kohoutek.

The main task on Christmas Day involved the mission’s second spacewalk. Carr and Pogue spent 7 hours and 1 minute outside the space station, then a record for Earth orbital spacewalks. In addition to replacing film cartridges in the ATM, they repaired a stuck filter wheel on an ATM instrument, and used an ultraviolet camera to photograph Comet Kohoutek. Once back inside the station, they enjoyed a Christmas dinner complete with fruitcake, talked to their families, and opened presents from the astronauts’ wives that the ground crew at NASA’s Kennedy Space Center in Florida had hidden in lockers in the Command Module.

In the Mission Control Center at NASA’s Johnson Space Center in Houston, Professor Luboš Kohoutek talks with the Skylab 4 crew Astronauts Gerald P. Carr, left, Edward G. Gibson, and William R. Pogue during the videoconference with Professor Kohoutek Gibson during the third Skylab 4 spacewalk, exclusively dedicated to study Comet Kohoutek
Left: In the Mission Control Center at NASA’s Johnson Space Center in Houston, Professor Luboš Kohoutek talks with the Skylab 4 crew. Middle: Astronauts Gerald P. Carr, left, Edward G. Gibson, and William R. Pogue during the videoconference with Professor Kohoutek. Right: Gibson during the third Skylab 4 spacewalk, exclusively dedicated to study Comet Kohoutek.

On Dec. 28, the day the astronauts reached the halfway point of their 84-day mission, they held an 11-minute video conference with the comet’s discoverer, Czech astronomer Luboš Kohoutek during his visit to the Mission Control Center at NASA’s Johnson Space Center (JSC) in Houston. The next day, Carr and Gibson completed the mission’s third spacewalk lasting 3 hours 29 minutes and dedicated to observing and photographing the comet. Although the crew’s work schedule had improved over the previous few weeks, the astronauts still found it difficult to accomplish the timeline the planners laid out for them. To rectify the problem, Carr requested a dedicated space to ground voice conference so the issues could be aired and rectified. Following what Carr later called the first sensitivity session in space on Dec. 30, planners understood the astronauts’ constraints and the crew worked more effectively the second half of the mission. Capsule communicator Richard H. Truly mentioned that JSC Director Christopher C. Kraft and Flight Crew Operations Chief Donald K. “Deke” Slayton had listened to the conversation and agreed that the teams “made about a million bucks” during the 55-minute conversation. The lessons learned about scheduling activities for long-duration spaceflights proved useful to later programs such as Shuttle/Mir and the International Space Station.

Williams R. Pogue, left, and Gerald P. Carr place bags into the trash airlock Edward G. Gibson floats into the large volume of the orbital workshop from airlock module Carr and Pogue demonstrate weightlessness
Left: Williams R. Pogue, left, and Gerald P. Carr place bags into the trash airlock. Middle: Edward G. Gibson floats into the large volume of the orbital workshop from airlock module. Right: Carr and Pogue demonstrate weightlessness.

On Jan. 1, 1974, Carr, Gibson, and Pogue celebrated the coming of the new year, the first space crew to observe that holiday along with Thanksgiving and Christmas. An American astronaut would not repeat that for 23 years until John E. Blaha during his four-month stay aboard the Mir space station in 1996-7. On Jan. 10, Carr, Gibson, and Pogue enjoyed a day off, meaning planners only scheduled one third of their time, freeing them to pursue activities of their own choosing. On the ground, mission managers held the 56-day review of the mission and based on the crew’s health and the station’s condition declared the mission go for 84 days, although strictly speaking, managers and flight surgeons approved the mission’s extension one week at a time.

For more insight into the Skylab 4 mission, read Carr’s, Gibson’s, and Pogue’s oral histories with the JSC History Office.

To be continued …

With special thanks to Ed Hengeveld for his expert contributions on Skylab imagery.

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Dec 18, 2023

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      At NASA’s Kennedy Space Center in Florida, engineers completed the Flight Readiness Test of the Apollo 13 Saturn V on Feb. 26. The test ensured that all systems are flight ready and compatible with ground support equipment, and the astronauts simulated portions of the countdown and powered flight. Successful completion of the readiness test cleared the way for a countdown dress rehearsal at the end of March. 
      John Young prepares for a flight aboard the Lunar Landing Training Vehicle.NASA John Young after a training flight aboard the landing trainer. NASA Fred Haise prepares for a flight at the Lunar Landing Research Facility. NASA One of the greatest challenges astronauts faced during a lunar mission entailed completing a safe landing on the lunar surface. In addition to time spent in simulators, Apollo mission commanders and their backups trained for the final few hundred feet of the descent using the Lunar Landing Training Vehicle at Ellington Air Force Base near the Manned Spacecraft Center, now NASA’s Johnson Space Center, in Houston. Bell Aerosystems of Buffalo, New York, built the trainer for NASA to simulate the flying characteristics of the Lunar Module. Lovell and Young completed several flights in February 1970. Due to scheduling constraints with the trainer, lunar module pilots trained for their role in the landing using the Lunar Landing Research Facility at NASA’s Langley Research Center in Hampton, Virginia. Haise and Duke completed training sessions at the Langley facility in February. 

      Charles Duke practices Lunar Module egress during a KC-135 parabolic flight. NASA Charles Duke rehearses unstowing equipment from the Lunar Module during a KC-135 parabolic flight. NASA The astronauts trained for moonwalks with parabolic flights aboard NASA’s KC-135 aircraft that simulated the low lunar gravity, practicing their ladder descent to the surface. On the ground, they rehearsed the moonwalks, setting up the American flag and the large S-band communications antenna, and collecting lunar samples. Engineers improved their spacesuits to make the expected longer spacewalks more comfortable for the crew members by installing eight-ounce bags of water inside the helmets for hydration. 

      James Lovell, left, and Fred Haise practice setting up science equipment, the American flag, and the S-band antenna.NASA Lovell, left, and Haise practice collecting rock samples. NASA John Young, left, and Charles Duke train to collect rock samples. NASA Fred Haise, left, and James Lovell practice lowering the Apollo Lunar Surface Experiment Package from the Lunar Module.NASA Lovell, left, and Haise practice setting up the experiments. NASA Lovell, left, and Haise practice drilling for the Heat Flow Experiment. NASA During their 35 hours on the Moon’s surface, Lovell and Haise planned to conduct two four-hour spacewalks to set up the Apollo Lunar Surface Experiment Package (ALSEP), a suite of four investigations designed to collect data about the lunar environment after the astronauts’ departure, and to conduct geologic explorations of the landing site. The four experiments included the: 
      Charged Particle Lunar Environment Experiment designed to measure the flexes of charged particles  Cold Cathode Gauge Experiment designed to measure the pressure of the lunar atmosphere  Heat Flow Experiment designed to make thermal measurements of the lunar subsurface  Passive Seismic Experiment designed to measure any moonquakes, either naturally occurring or caused by artificial means   As an additional investigation, the astronauts planned to deploy and retrieve the Solar Wind Composition experiment, a sheet of aluminum foil to collect particles from the solar wind for analysis by scientists back on Earth after about 20 hours of exposure on the lunar surface. 

      Apollo 14 astronauts Eugene Cernan, left, Joe Engle, Edgar Mitchell, and Alan Shepard with geologist Richard Jahns in the Pinacates Mountains of northern Mexico. NASA Shepard, left, Engle, Mitchell, and Cernan training with the Modular Equipment Transporter, accompanied by geologist Jahns. NASA With one lunar mission just two months away, NASA continued preparations for the following flight, Apollo 14, then scheduled for October 1970 with a landing targeted for the Littrow region of the Moon, an area scientists believed to be of volcanic origin. Apollo 14 astronauts Alan Shepard, Stuart Roosa, and Edgar Mitchell and their backups Eugene Cernan, Ronald Evans, and Joe Engle  learned spacecraft systems in the simulators. Accompanied by a team of geologists led by Richard Jahns, Shepard, Mitchell, Cernan, and Engle participated in a geology expedition to the Pinacate Mountain Range in northern Mexico Feb. 14-18, 1970. The astronauts practiced using the Modular Equipment Transporter, a two-wheeled conveyance to transport tools and samples on the lunar surface. 

      Mail out of the Apollo 12 lunar samples. Apollo 12 astronauts Charles Conrad, left, Richard Gordon, and Alan Bean ride in a motorcade in Lima, Peru.NASA On Feb. 13, 1970, NASA began releasing Apollo 12 lunar samples to 139 U.S. and 54 international scientists in 16 countries, a total of 28.6 pounds of material. On Feb. 16, Apollo 12 astronauts Charles Conrad, Richard Gordon, and Alan Bean, accompanied by their wives and NASA and State Department officials, departed Houston’s Ellington Air Force Base for their 38-day Bullseye Presidential Goodwill World Tour. They first traveled to Latin America, making stops in Venezuela, Peru, Chile, and Panama before continuing on to Europe, Africa, and Asia. 
      The groundbreaking science and discoveries made during Apollo missions has pushed NASA to explore the Moon more than ever before through the Artemis program. Apollo astronauts set up mirror arrays, or “retroreflectors,” on the Moon to accurately reflect laser light beamed at them from Earth with minimal scattering or diffusion. Retroreflectors are mirrors that reflect the incoming light back in the same incoming direction. Calculating the time required for the beams to bounce back allowed scientists to precisely measure the Moon’s shape and distance from Earth, both of which are directly affected by Earth’s gravitational pull. More than 50 years later, on the cusp of NASA’s crewed Artemis missions to the Moon, lunar research still leverages data from those Apollo-era retroreflectors. 

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    • By NASA
      Official portrait of NASA Associate Administrator Jim Free, taken on Nov. 22, 2024, at the agency’s headquarters in Washington.Credit: NASA/Bill Ingalls NASA Associate Administrator Jim Free announced Wednesday his retirement, effective Saturday, Feb. 22. As associate administrator, Free has been the senior advisor to NASA Acting Administrator Janet Petro and leads NASA’s 10 center directors, as well as the mission directorate associate administrators at NASA Headquarters in Washington. He is the agency’s chief operating officer for more than 18,000 employees and oversaw an annual budget of more than $25 billion.  
      During his tenure as associate administrator since January 2024, NASA added nearly two dozen new signatories of the Artemis Accords, enabled the first Moon landing through the agency’s CLPS (Commercial Lunar Payload Services) initiative to deliver NASA science to the lunar surface, launched the Europa Clipper mission to study Jupiter’s icy ocean moon, and found molecules containing the ingredients for life in samples from asteroid Bennu delivered to Earth by NASA’s OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification and Security–Regolith Explorer) spacecraft.
      “Throughout his career, Jim has been the ultimate servant leader – always putting the mission and the people of NASA first,” said Petro. “A remarkable engineer and a decisive leader, he combines deep technical expertise with an unwavering commitment to this agency’s mission. Jim’s legacy is one of selfless service, steadfast leadership, and a belief in the power of people.”
      Among the notable contributions to the nation during his NASA career, Free also championed a new path forward to return samples from Mars ahead of human missions to the Red Planet, supported the crews living and working aboard the International Space Station as they conduct hundreds of experiments and technology demonstrations, and engaged industry in new ways to secure a public/private partnership for NASA’s VIPER (Volatiles Investigating Polar Exploration Rover) mission on the Moon. 
      “It has been an honor to serve NASA and walk alongside the workforce that tackles the most difficult engineering challenges, pursues new scientific knowledge in our universe and beyond, develops technologies for future exploration endeavors, all while prioritizing safety every day for people on the ground, in the air, and in space,” Free said. “I am grateful for the opportunity to be part of the NASA family and contribute to the agency’s mission for the benefit of humanity.”
      During his more than three decades of service, Free has held several leadership roles at the agency. Before being named NASA associate administrator, Free served as associate administrator of the Exploration Systems Development Mission Directorate, where he oversaw the successful Artemis I mission and the development of NASA’s Moon to Mars architecture, defining and managing the systems development for the agency’s Artemis missions and planning for NASA’s integrated deep space exploration approach. 
      Free began his NASA career in 1990 as an engineer, working on Tracking and Data Relay Satellites at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. He later transferred to the agency’s Glenn Research Center in Cleveland and served in a variety of roles supporting the International Space Station and the development of the Orion spacecraft before transferring to NASA’s Johnson Space Center in Houston in 2008. Free returned to NASA Glenn in 2009 and was promoted to chief of the Space Flight Systems Directorate, where he oversaw the center’s space work. Free was named deputy center director in November 2010 and then served as center director from January 2013 until March 2016, when he was appointed to the NASA Headquarters position of deputy associate administrator for Technical [sic] in the Human Exploration and Operations Mission Directorate.
      A native of Northeast Ohio, Free earned his bachelor’s degree in aeronautics from Miami University in Oxford, Ohio, and his master’s degree in space systems engineering from Delft University of Technology in the Netherlands. 
      Free is the recipient of the Presidential Rank Award, NASA Distinguished Service Medal, NASA Outstanding Leadership Medal, NASA Exceptional Service Medal, NASA Significant Achievement Medal, and numerous other awards.
      For more information about NASA, visit:
      https://www.nasa.gov
      -end-
      Kathryn Hambleton / Cheryl Warner
      Headquarters, Washington
      202-358-1600
      kathryn.hambleton@nasa.gov / cheryl.m.warner@nasa.gov
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      Last Updated Feb 19, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
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