In the Starlight: Tristan McKnight Brings NASA’s Historic Moments to Life  

In the Starlight: Tristan McKnight Brings NASA’s Historic Moments to Life  

For more than a decade, Tristan McKnight has been a driving force behind some of NASA’s most iconic events, orchestrating the behind-the-scenes magic that brings each historic moment to life while sharing the agency’s advancements with the public. 

As a multimedia producer on the audiovisual team at Johnson Space Center in Houston, McKnight produces and directs live broadcasts and manages event planning, coordination, and execution. From overseeing resources, mitigating risks, and communicating with stakeholders, he ensures every detail aligns seamlessly.  

Professional headshot of a man wearing a dark suit and tie, smiling against a background featuring the United States flag and a NASA emblem.
Official portrait of Tristan McKnight.
NASA/Josh Valcarcel

McKnight has played an integral role in the audiovisual team’s coverage of major events including the Artemis II crew announcement, where NASA revealed the astronauts who will venture around the Moon and back, to Johnson’s 2023 Open House, which celebrated the agency’s 65th anniversary and the 25th anniversary of the International Space Station’s operations. These achievements highlight key milestones in human space exploration.  

A standout achievement was contributing to the Dorothy Vaughan Center in Honor of the Women of Apollo naming ceremony, held on the eve of the 55th anniversary of the Apollo 11 Moon landing. The event honored the unsung heroes who made humanity’s first steps on the Moon possible. 

The team’s dedication and passion are a testament to their commitment to sharing NASA’s legacy with the world. 

“Not only have these events been impactful to Johnson, but they have also resonated across the entire agency,” McKnight said. “That is what I’m most proud of!” 

Man wearing a black NASA polo shirt, smiling and holding a colorful poster titled ’The Color of Space.’
Tristan McKnight at the 45th Annual Original Martin Luther King Jr. Day Parade in downtown Houston.
NASA/James Blair

One of McKnight’s most memorable events was the 2023 “Back in the Saddle,” an annual tradition designed to refocus Johnson’s workforce at the start of a new year and renew the center’s commitment to safety and mission excellence. McKnight recalled how the speaker transformed Johnson’s Teague Auditorium into a venue filled with drum kits, inspiring messages, and lighting displays. Each audience member, drumsticks in hand, participated in a lesson on teamwork and synchronization to create a metaphor for working in harmony toward a shared goal. 

Like many high-achieving professionals. McKnight has faced moments of self-doubt. Then he realized that he is exactly where he is supposed to be. “As I settled into my role, I recognized that my contributions matter and simply being true to who I am adds value to the Johnson community,” he said.  

Tristan McKnight (right) receives a Group Special Act Award from Johnson Space Center Director Vanessa Wyche for his contributions to the Dorothy Vaughn in Honor of the Women of Apollo naming ceremony.
NASA

Each day brings its own set of challenges, ranging from minor issues like communication gaps and scheduling conflicts to major obstacles like technology failures. One of McKnight’s most valuable lessons is recognizing that there is no one-size-fits-all solution, and each situation requires a thoughtful analysis. 

McKnight understands the importance of the “check-and double-check,” a philosophy he considers crucial when working with technology. “Taking the extra time to do your due diligence, or even having someone else take a look, can make all the difference,” he said. 

“The challenges I’ve faced helped me grow as a problem solver and taught me valuable lessons on resilience and adaptability in the workplace,” he said. McKnight approaches obstacles with a level head, focusing on effective solutions rather than dwelling on the problem. 

Tristan McKnight (left) with his daughter Lydia McKnight and Johnson’s External Relations Director Arturo Sanchez at the 2024 Bring Your Youth To Work Day.
NASA/Helen Arase Vargas

As humanity looks to the stars, McKnight is energized about the future of exploration, particularly advancements in spacesuit and rocket technology that will enable us to travel farther, faster, and safer than ever before. His work, though grounded on Earth, helps create the inspiration that fuels these bold endeavors. 

“My hope for the next generation is that they dive deeper into their curiosity—exploring not only the world around them but also the Moon, planets, and beyond,” he said. “I also hope they carry forward the spirit of resilience and a commitment to making the world a better place for all.” 

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Sumer Loggins

Keeping Crews Healthy Farther Away from Earth Key Station Research Topic

Keeping Crews Healthy Farther Away from Earth Key Station Research Topic

Astronaut Suni Williams (center) is dwarfed near the SpaceX Dragon crew spacecraft during a spacewalk on Jan. 16, 2025, as the space station orbited 267 miles above a cloudy Pacific Ocean east of New Zealand. Astronauts undergo standard health checks prior to conducting a spacewalk to ensure their readiness.
Astronaut Suni Williams (center) is dwarfed near the SpaceX Dragon crew spacecraft during a spacewalk on Jan. 16, 2025, as the space station orbited 267 miles above a cloudy Pacific Ocean east of New Zealand. Astronauts undergo standard health checks prior to conducting a spacewalk to ensure their readiness.
NASA

The Expedition 72 crew continued its research on Wednesday to better understand space-caused eye pressure changes and ensure crew members stay healthy on future missions to the Moon, Mars, and beyond. The orbital residents also kept up the continuous operations of critical science gear and life support systems on the International Space Station.

Commander Suni Williams and Flight Engineer Nick Hague joined each other on Wednesday studying a method that may reduce space-caused pressure on the back of an astronaut’s eyes. The lack of gravity leads body fluids toward a crew member’s head potentially causing eye structure and vision problems. Williams tried on a thigh cuff that may reverse the headward fluid shifts and protect crews on long-term missions farther away from Earth. Hague performed an ultrasound scan on Williams, examined her eyes, and measured her blood pressure to test the effectiveness of the biomedical device during the human research study.

NASA Flight Engineers Don Pettit and Butch Wilmore spent their day servicing a variety of science hardware and life support systems throughout the orbital outpost’s U.S. segment. Maintaining the advanced science gear is necessary to ensure successful operations of space research experiments and the preservation of numerous types of samples for analysis both on Earth and on the space station. Keeping up life support systems is critical to preserving the orbital lab’s atmosphere for a safe, habitable crew environment in microgravity.

Pettit first disconnected a laptop computer that supported the Plant UV-B study observing how microgravity stress and high ultraviolet radiation affect plant growth in space. Next, he installed an airflow sensor in the Harmony module then measured air velocity inside the Kibo laboratory module’s ventilation system. Wilmore started his day downloading radiation exposure data to a laptop computer. Afterward, he swabbed surfaces in the Kibo, Columbus, and Unity modules to collect microbe samples for analysis. At the end of his shift, Wilmore disassembled the NanoRacks CubeSat Deployer, that deploys microsatellites outside the space station, in preparation for its return to Earth.

Working in the Roscosmos segment of the orbiting lab, Flight Engineers Alexey Ovchinin and Ivan Vagner explored the neutron radiation exposure the space station experiences and ways to shield space radiation. The duo installed components on the neutron radiation detection unit and also conducted a photographic inspection of the device. Flight Engineer Aleksandr Gorbunov repaired a water recovery system and worked on water transfer tasks.

Learn more about station activities by following the space station blog, @space_station and @ISS_Research on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

25 Years Ago: STS-99, the Shuttle Radar Topography Mission

25 Years Ago: STS-99, the Shuttle Radar Topography Mission

On Feb. 11, 2000, space shuttle Endeavour took to the skies on its 14th trip into space on the Shuttle Radar Topography Mission (SRTM). The international STS-99 crew included Commander Kevin Kregel, Pilot Dominic Gorie, and Mission Specialists Gerhard Thiele of Germany representing the European Space Agency, Janet Kavandi, Janice Voss, who served as payload commander on the mission, and Mamoru Mohri of the National Space Development Agency (NASDA) of Japan, now the Japan Aerospace Exploration Agency.  

During their 11-day mission, the astronauts used the radar instruments in Endeavour’s payload bay to obtain elevation data on a near global scale. The data produced the most complete, high-resolution digital elevation model of the Earth. The SRTM comprised a cooperative effort among NASA with the Jet Propulsion Laboratory (JPL) in Pasadena, California, managing the project, the Department of Defense’s National Imagery and Mapping Agency, the German space agency, and the Italian space agency. Prior to SRTM, scientists had a more detailed topographic map of Venus than of the Earth, thanks to the Magellan radar mapping mission. 

NASA assigned the STS-99 crew in October 1998. For Kregel, selected by NASA as an astronaut in 1992, STS-99 marked his fourth trip to space, having served as pilot on STS-70 and STS-78 and commanded STS-87. Gorie and Kavandi, both selected in 1994, previously flew together as pilot and mission specialist, respectively, on STS-91, the final Shuttle Mir docking mission. Voss, selected in 1990, served as a mission specialist on STS-57 and STS-63, and as payload commander on STS-83 and STS-94. NASDA selected Mohri as an astronaut in 1985 and he previously flew as a payload specialist on STS-47, the Spacelab-J mission. Selected as an astronaut by the German space agency in 1987, Thiele joined the European Astronaut Corps in 1998, completing his first spaceflight on STS-99.  

The SRTM used an innovative technique called radar interferometry to image the Earth’s landmasses at resolutions up to 30 times greater than previously achieved. Two of the synthetic aperture radar instruments comprising the SRTM payload had flown previously, on the STS-59 Shuttle Radar Laboratory-1 (SRL-1) and the STS-68 SRL-2 missions in April and October 1994, respectively.  A second receiver antenna, placed at the end of a 200-foot deployable mast, enabled the interferometry during SRTM. 

Workers rolled Endeavour to the Vehicle Assembly Building on Dec. 2 for mating with its external tank and solid rocket boosters, and then out to Launch Pad 39A on Dec. 13. The astronauts traveled to Kennedy to participate in the Terminal Countdown Demonstration Test Jan. 11-14, returning afterwards to Houston for final training. They traveled back to Kennedy on Jan. 27 for the first launch attempt four days later. After two launch attempts, the STS-99 mission prepared to liftoff on Feb. 11, 2000. 

Image of a space shuttle lifting off on a pillar of fire into a blue sky.
Liftoff! Space shuttle Endeavour takes to the skies to begin the STS-99 mission.

At 12:43 p.m. EST, Endeavour thundered into the sky from Kennedy’s Launch Pad 39A to begin the STS-99 mission. Thirty-seven minutes later, a brief firing of the orbiter’s two engines placed Endeavour in the proper 145-mile orbit for the radar scanning. 

Shortly after reaching orbit, the crew opened the payload bay doors and deployed the shuttle’s radiators.   Kavandi and Thiele turned on the instruments, deployed the 200-foot mast, and conducted initial checkouts of the radars. The crew split into two shifts to enable data collection around the clock during the mission. After overseeing the initial activation of the radars, the red shift of Kregel, Kavandi, and Thiele began their first sleep period as the blue shift of Gorie, Voss, and Mohri picked up with activation and began the first data takes. 

The major crew activity for SRTM involved changing tapes every 30 minutes. The SRTM generated 332 high density tapes during more than 222 hours of data collection and these recordings covered 99.96 percent of the planned observations. Data collection finished on the mission’s 10th flight day, after which the astronauts reeled the mast back into its container in the payload bay. 

NASA’s EarthKAM program enabled middle school students to remotely take photographs of the Earth using an electronic still camera mounted in one of the shuttle’s windows. The University of California at San Diego houses the control center for EarthKAM, linked with middle schools via the Internet. Students choose Earth targets of interest, and the camera takes photos of that region as the shuttle passes overhead. A then-record 75 schools from around the world participated in the EarthKAM project on STS-99, the camera returning 2,715 images of the Earth. 

The STS-99 astronauts also spent time taking photographs of the Earth using handheld cameras and the high inclination orbit enabled views of some parts of the Earth rarely seen by shuttle astronauts. 

On Feb. 22, the crew closed Endeavour’s payload bay doors, donned their launch and entry suits, and strapped themselves into their seats for entry and landing. Kregel piloted Endeavour to a smooth landing on Kennedy’s Shuttle Landing Facility. The crew had flown 181 orbits around the Earth in 11 days, 5 hours, and 39 minutes. Enjoy the crew narrate a video about the STS-99 mission.  

Postscript 

Multicolor Mercator projection of the world showing the areas imaged by the space shuttle - the most imagery in green, no imagery in red.
Final coverage map for the SIR-C radar, indicating 99.96 percent coverage of planned land mass targets, with many areas imaged more than once.

During the 11-day mission, SRTM collected more than one trillion data points, generating 12.3 terabytes of 3-D data of the Earth. Earnest Paylor, SRTM program scientist at NASA Headquarters in Washington, D.C., called the mission “a magnificent accomplishment.” He cited that SRTM imaged by radar equatorial regions of the Earth previously unmapped due to constant cloud cover. 

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John J. Uri

NASA’s Polar Ice Experiment Paves Way for Future Moon Missions 

NASA’s Polar Ice Experiment Paves Way for Future Moon Missions 

Artistic rendering of Intuitive Machines’ Nova-C lander on the surface of the Moon.
Credit: Intuitive Machines

NASA’s Polar Resources Ice Mining Experiment-1 (PRIME-1) is preparing to explore the Moon’s subsurface and analyze where lunar resources may reside. The experiment’s two key instruments will demonstrate our ability to extract and analyze lunar soil to better understand the lunar environment and subsurface resources, paving the way for sustainable human exploration under the agency’s Artemis campaign for the benefit of all. 

Its two instruments will work in tandem: The Regolith and Ice Drill for Exploring New Terrains (TRIDENT) will drill into the Moon’s surface to collect samples, while the Mass Spectrometer Observing Lunar Operations (MSOLO) will analyze these samples to determine the gas composition released across the sampling depth. The PRIME-1 technology will provide valuable data to help us better understand the Moon’s surface and how to work with and on it. 

“The ability to drill and analyze samples at the same time allows us to gather insights that will shape the future of lunar resource utilization,” said Jackie Quinn, PRIME-1 project manager at NASA’s Kennedy Space Center in Florida. “Human exploration of the Moon and deep space will depend on making good use of local resources to produce life-sustaining supplies necessary to live and work on another planetary body.” 

The PRIME-1 experiment is one of the NASA payloads aboard the next lunar delivery through NASA’s CLPS (Commercial Lunar Payload Services) initiative, set to launch from the agency’s Kennedy Space Center no earlier than Wednesday, Feb. 26, on Intuitive Machines’ Athena lunar lander and explore the lunar soil in Mons Mouton, a lunar plateau near the Moon’s South Pole. 

Developed by Honeybee Robotics, a Blue Origin Company, TRIDENT is a rotary percussive drill designed to excavate lunar regolith and subsurface material up to 3.3 feet (1 meter) deep. The drill will extract samples, each about 4 inches (10 cm) in length, allowing scientists to analyze how trapped and frozen gases are distributed at different depths below the surface.  

The TRIDENT drill is equipped with carbide cutting teeth to penetrate even the toughest lunar materials. Unlike previous lunar drills used by astronauts during the Apollo missions, TRIDENT will be controlled from Earth. The drill may provide key information about subsurface soil temperatures as well as gain key insight into the mechanical properties of the lunar South Pole soil. Learning more about regolith temperatures and properties will greatly improve our understanding of the environments where lunar resources may be stable, revealing what resources may be available for future Moon missions.  

A commercial off-the-shelf mass spectrometer, MSOLO, developed by INFICON and made suitable for spaceflight at Kennedy, will analyze any gas released from the TRIDENT drilled samples, looking for the potential presence of water ice and other gases trapped beneath the surface. These measurements will help scientists understand the Moon’s potential for resource utilization. 

Under the CLPS model, NASA is investing in commercial delivery services to the Moon to enable industry growth and support long-term lunar exploration. As a primary customer for CLPS deliveries, NASA is one of many customers on future flights. PRIME-1 was funded by NASA’s Space Technology Mission Directorate Game Changing Development program. 

Learn more about CLPS and Artemis at: 

https://www.nasa.gov/clps

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Stephanie Plucinsky

A Rainbow-colored “Feather” in the Martian Sky

A Rainbow-colored “Feather” in the Martian Sky

A shining, feather-shaped cloud in the dark gray Martian sky. The cloud is white, with a faint rainbow tint.
NASA/JPL-Caltech/MSSS

NASA’s Curiosity Mars rover captured this feather-shaped iridescent cloud just after sunset on Jan. 27, 2023. Studying the colors in iridescent clouds tells scientists something about particle size within the clouds and how they grow over time. These clouds were captured as part of a seasonal imaging campaign to study noctilucent, or “night-shining” clouds. A new campaign in January 2025 led to Curiosity capturing this video of red- and green-tinged clouds drifting through the Martian sky.

Learn more about iridescent twilight clouds on Mars.

Image credit: NASA/JPL-Caltech/MSSS

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Monika Luabeya