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By NASA
NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Alex Parker This image, taken by NASA’s New Horizons spacecraft on July 14, 2015, is the most accurate natural color image of Pluto. This natural-color image results from refined calibration of data gathered by New Horizons’ color Multispectral Visible Imaging Camera (MVIC). The processing creates images that would approximate the colors that the human eye would perceive, bringing them closer to “true color” than the images released near the encounter. This single color MVIC scan includes no data from other New Horizons imagers or instruments added. The striking features on Pluto are clearly visible, including the bright expanse of Pluto’s icy, nitrogen-and-methane rich “heart,” Sputnik Planitia.
Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Alex Parker
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By NASA
Teresa Sindelar always knew she wanted to be a part of human spaceflight, but she was unsure how to make that dream a reality until a chance encounter with former NASA astronaut Tom Stafford when she was 11 years old.
The pair met in a local jewelry shop near Sindelar’s Nebraska home, where Gen. Stafford was signing autographs. In addition to his photo, Gen. Stafford gave Sindelar a valuable tip – she should check out the Kansas Cosmosphere, a space museum in Hutchinson, Kansas. “I proceeded to attend every camp the Cosmosphere offered as a student, interned during college, and worked there full time while earning my graduate degree,” Sindelar said.
Official portrait of Teresa Sindelar.NASA She discovered a passion for teaching and mentoring young students through her work in the museum’s education department and a stint as a high school science teacher. When she began looking for opportunities at NASA, she sought a position that melded instruction with technical work. “I like pouring into others and watching them grow,” she said.
Today, Sindelar is a chief training officer (CTO) within the Flight Operations Directorate at NASA’s Johnson Space Center in Houston. Along with her fellow CTOs, Sindelar oversees the correct and complete training of NASA astronauts, crew members representing international partners, and all flight controllers. “I put the pieces together,” she said. “It is my job to make sure instructors, schedulers, outside partners, facility managers, and others are all in sync.” She added that CTOs have a unique position because they see the big picture of a training flow and understand the long-term training goals and objectives.
Teresa Sindelar received a 2025 Space Flight Awareness Program Honoree Award, presented by NASA astronaut Randy Bresnik.NASA “I get to do a lot of cool things and go to a lot of cool places,” she said, noting that the training facilities at Johnson and other NASA centers, as well as facilities managed by international partners, are top-notch. While she does enjoy watching astronauts work through problems and learn new systems, she has a special fondness for flight controller training and mentoring young professionals. “What fills my cup the most is seeing a brand-new employee right out of college blossom into a confident flight controller, do their job well, and make our missions better,” she said. “I like knowing that I had something to do with that.”
Sindelar has been part of the Johnson team since 2010 and worked as an educator in what was then called the center’s Office of Education and as a crew training instructor in the Space Medicine Operations Directorate before becoming a CTO. In March 2025, Sindelar received a Space Flight Awareness Program Honoree Award for her outstanding leadership in the Private Astronaut Mission (PAM) program, which is an important component of NASA’s strategy for enabling a robust and competitive commercial economy in low Earth orbit. As the lead CTO for the third PAM, Axiom Mission 3, Sindelar managed training while identifying critical inefficiencies, enhancing mission safety and performance. She spearheaded a key stakeholder retreat to streamline operations, reorganized training resources for improved accessibility, and implemented efficiency improvements that optimized mission support. Sindelar’s work was recognized during an award ceremony at NASA’s Kennedy Space Center in Florida, and she got to attend the launch of NASA’s SpaceX Crew-10 mission as a special guest.
In her 15 years with the agency, she has learned the importance of leading by example. “My team needs to see that I meet the bar I set,” she said. “Leading is about motivating your people so they are committed, not just compliant.”
Teresa Sindelar (front row, third from left) and her Space Medicine Operations crew training team with the crew members of Expedition 48.NASA Keeping a team motivated and on track is particularly important to training success and safety. “We only get a matter of months to train astronauts to do the most hazardous activities that humans have done, or to train flight controllers who literally have the mission and the lives of astronauts in their hands,” Sindelar said, adding that they cannot afford to have an unfocused or indifferent team.
Sindelar observed that Johnson’s training team is acutely aware of their responsibilities. “We live and work in the same communities as the crew members,” she said. “We see them at school functions, at the grocery store, at the park. We know their families are counting on us to bring their loved ones home safely.”
She has also learned that her voice matters. “When I was a young professional, I just never felt I could be influential, but the only person holding me back was me,” she said. “I had to learn to trust in my own instincts. That was definitely outside of my comfort zone.” She credits her mentors with helping her build confidence and knowing when and how to speak up. “I have had many giants of the spaceflight community mold and shape me in my career, from my counselors at the Cosmosphere all the way to flight directors and astronauts,” she said. “It is my privilege to learn from them, and I am grateful to each of them.”
Outside of work, Sindelar uses her voice in a different way – as part of her church choir. She also plays piano, stating that she is as passionate about music and volunteerism as she is about human spaceflight. She is a member of the Friendswood Volunteer Fire Department, as well, serving on its rehab team and as the department’s chaplain
Teresa Sindelar (second from right) and her family with a Friendswood Volunteer Fire Department fire engine. Image courtesy of Teresa Sindelar As NASA prepares to return humans to the Moon and journey on to Mars, Sindelar hopes she has taught the next generation of explorers enough so they can show the world the wonders of the universe. “This next generation will see and do things my generation never even thought of,” she said, adding that it is time for them to start leading. “Use your voice. Take care of each other along the way. Reach out and help the next one in line.”
Sindelar keeps a reminder of that important message on her desk: the picture Gen. Stafford signed all those years ago.
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By NASA
As Hubble marks three and a half decades of scientific breakthroughs and technical resilience, the “Hubble at 35 Years” symposium offers a platform to reflect on the mission’s historical, operational, and scientific legacy. Hubble’s trajectory—from early challenges to becoming a symbol of American scientific ingenuity—presents valuable lessons in innovation, collaboration, and crisis response. Bringing together scientists, engineers, and historians at NASA Headquarters ensures that this legacy informs current and future mission planning, including operations for the James Webb Space Telescope, Roman Space Telescope, and other next-generation observatories. The symposium not only honors Hubble’s transformative contributions but also reinforces NASA’s commitment to learning from the past to shape a more effective and ambitious future for space science.
Hubble at 35 Years
Lessons Learned in Scientific Discovery and NASA Flagship Mission Operations
October 16–17, 2025
James Webb Auditorium, NASA HQ, Washington, D.C.
The giant Hubble Space Telescope (HST) can be seen as it is suspended in space by Discovery’s Remote Manipulator System (RMS) following the deployment of part of its solar panels and antennae on April 25, 1990.NASA The story of the Hubble Space Telescope confirms its place as the most transformative and significant astronomical observatory in history. Once called “the eighth wonder of the world” by a former NASA administrator, Hubble’s development since its genesis in the early 1970s and its launch, repair, and ultimate impact since 1990 provide ample opportunity to apply insights from its legacy. Scientists and engineers associated with groundbreaking discoveries have always operated within contexts shaped by forces including the government, private industry, the military, and the public at large. The purpose of this symposium is to explore the insights from Hubble’s past and draw connections that can inform the development of mission work today and for the future.
Contact the Organizer Keep Exploring Discover More Topics From NASA
Hubble’s 35th Anniversary
Universe
Humans In Space
NASA History
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By Space Force
The U.S. Space Force released its inaugural International Partnership Strategy July 8, outlining a comprehensive vision for deepening collaboration with allies and partners to ensure a secure, stable and sustainable space domain.
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By Space Force
The new facility is enabling Guardians and mission partners to seamlessly monitor space-based sensors and make rapid, data-driven decisions that enhance missile warning and threat responses for the joint force.
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