More than a thousand hours in space, and now he teaches the world what it means
A man who once floated above the Earth for more than a thousand hours has come to stand among those who have only ever looked up. Donald Thomas, a retired NASA astronaut whose four Space Shuttle missions between 1994 and 1997 carried him through microgravity experiments and satellite deployments, visited Brazil's Space Adventure museum in Balneário Camboriú this week — not as a relic of a distant era, but as a living bridge between the cosmos and the curious. At 71, his presence in South America speaks to something enduring in human nature: the need to share what has been witnessed, and to make the extraordinary feel within reach.
- A man with over 1,040 hours in orbit and four Space Shuttle missions to his name arrived in Balneário Camboriú, carrying decades of firsthand knowledge that few people on Earth possess.
- Space Adventure — Brazil's largest collection of space agency artifacts outside the United States — became the unlikely stage for a collision between lived cosmic experience and public curiosity.
- Thomas's visit is part of a broader lecture circuit threading through international education and technology projects, signaling that the frontier of space exploration now runs through classrooms and museum floors as much as launch pads.
- At 71, a career that stretched from reviewing shuttle payload materials in Houston to directing NASA operations in Star City, Russia, is now being distilled into something a child in Brazil can touch and understand.
Donald Thomas arrived in Balneário Camboriú on Monday with a résumé that commands silence. The 71-year-old retired NASA astronaut had logged more than a thousand hours in space across four missions, conducted microgravity experiments, deployed satellites, and trained cosmonauts in Russia. His destination was Space Adventure, Brazil's largest collection of space agency artifacts outside the United States, where he toured the facility, engaged with its immersive experiences, and spoke with journalists as part of a lecture circuit on international education, science, and technology.
His road to orbit had been built on rigorous science. Born in Cleveland, Thomas earned degrees in physics and materials science before joining NASA's Johnson Space Center in 1988 as a materials engineer. He became an astronaut in July 1991 and went on to serve in multiple roles, including directing NASA operations at the Yuri Gagarin Cosmonaut Training Center in Star City, Russia — a posting that reflected how international space exploration had already become.
His four missions as a mission specialist left a distinct mark on the shuttle program. The STS-65 Columbia flight in 1994 set a shuttle duration record while running more than 80 experiments. STS-70 deployed the final tracking and data relay satellite in the shuttle program. STS-83 was cut short by a power failure, but Thomas flew the identical mission again three months later as STS-94, completing the full microgravity research program in materials and combustion science.
After his final flight, Thomas continued as a scientist overseeing NASA experiments aboard the International Space Station before retiring in 2007. Now, more than a decade later, he is carrying that full arc of experience — from laboratory benches to low Earth orbit — to audiences in Brazil, translating the work of space agencies into something tangible for people who have only ever watched the sky.
Donald Thomas arrived in Balneário Camboriú on Monday afternoon with the kind of résumé that stops conversation. The 71-year-old retired NASA astronaut had spent more than a thousand hours in space across four separate missions, conducted experiments in microgravity, deployed satellites, and trained cosmonauts in Russia. Now he was visiting Space Adventure, Brazil's largest collection of space agency artifacts outside the United States, to spend time with the museum and speak with the press.
Thomas was in the country as part of a lecture circuit focused on international projects in education, science, and technology. His visit to Space Adventure, scheduled for 3:30 p.m. at Avenida das Flores 455 in the Estados neighborhood, would include a tour of the facility, participation in the museum's immersive experiences, and conversations with journalists. It was the kind of public engagement that has become part of his work since retiring from NASA in July 2007.
His path to the astronaut corps had been methodical and grounded in serious science. Born in Cleveland, Thomas earned a bachelor's degree in physics, a master's in sciences, and a doctorate in materials science. Before joining NASA, he worked at the Lockheed Engineering and Sciences Company in Houston, where he reviewed materials used in Space Shuttle payloads. In 1988, he moved to NASA's Johnson Space Center as a materials engineer, working on advanced composite materials intended for the Space Station Freedom. He also served as principal investigator for the Microgravity Disturbances Experiment, a crystal-growth study that flew aboard the Space Shuttle in January 1990.
Thomas became an astronaut in July 1991 and served in multiple roles within the Astronaut Office, including communications specialist for three shuttle missions. From 1999 to 2000, he directed NASA operations at the Yuri Gagarin Cosmonaut Training Center in Star City, Russia—a position that reflected the international nature of space exploration even then. His four missions as a mission specialist spanned from 1994 to 1997 and accumulated 1,040 hours in orbit.
The STS-65 Columbia mission in July 1994 set a Space Shuttle program duration record, completing 353 hours and 55 minutes across 236 orbits while carrying the second International Microgravity Laboratory and conducting more than 80 experiments. The following year, STS-70 Discovery deployed the sixth and final tracking and data relay satellite for the shuttle program, traveling 3.7 million miles in 142 orbits. A third mission, STS-83 Columbia in April 1997, was cut short after 95 hours and 63 orbits due to a power generation unit failure. Thomas flew the same mission again three months later as STS-94, this time completing the full microgravity research program focused on materials and combustion, logging 376 hours and 45 minutes across 251 orbits.
After his final spaceflight, Thomas worked as a scientist on the International Space Station program, supervising NASA experiments conducted aboard the orbiting laboratory. His career represented the full arc of modern space exploration—from materials science on the ground to operations in orbit to training the next generation of space explorers. Now, at 71, he was bringing that experience to audiences in Brazil, making the work of space agencies tangible and accessible to people who had never left Earth.
Citas Notables
Thomas is in Brazil participating in international projects focused on education, science, and technology— NSC Total reporting
La Conversación del Hearth Otra perspectiva de la historia
What brings a retired astronaut to a museum in Brazil, of all places?
He's on a lecture tour focused on science and technology education. Space exploration isn't just about the missions anymore—it's about showing people what's possible, what we've learned, what we can do together across borders.
Four missions, over a thousand hours in space. That's a lot of time away from Earth. What was he actually doing up there?
Mostly microgravity research—experiments with materials, crystal growth, combustion. The kind of work that sounds abstract until you realize it leads to better materials, better medicines, better understanding of how things work when gravity isn't pulling them down.
He trained cosmonauts in Russia. That seems significant given the Cold War history.
It does. By the late 1990s, space exploration had become genuinely international. NASA and Russia were working together on the Space Station. Thomas directing operations at the Gagarin Center showed how far things had come.
Why would Brazil's space museum want him there specifically?
Because he's lived the work. He can tell people what it actually felt like, what the research meant, why it matters. That's different from reading about it.
Do you think he misses it—being in space?
Probably. But he's found another way to be part of it. Education and public engagement are their own kind of mission.