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Childhood Snow Days Transformed Linette Boisvert into a Sea Ice Scientist
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
A ship plows through rough seas in the Bering Sea in the aftermath of Typhoon Tip, one of the largest hurricanes on record. The Sentinel-6B satellite will provide data crucial to forecasting sea states, information that can help ships avoid danger. CC BY 2.0 NOAA/Commander Richard Behn Sea surface height data from the Sentinel-6B satellite, led by NASA and ESA, will help with the development of marine weather forecasts, alerting ships to possible dangers.
Because most global trade travels by ship, accurate, timely ocean forecasts are essential. These forecasts provide crucial information about storms, high winds, and rough water, and they depend on measurements provided by instruments in the ocean and by satellites including Sentinel-6B, a joint mission led by NASA and ESA (European Space Agency) that will provide essential sea level and other ocean data after it launches this November.
The satellite will eventually take over from its twin, Sentinel-6 Michael Freilich, which launched in 2020. Both satellites have an altimeter instrument that measures sea levels, wind speeds, and wave heights, among other characteristics, which meteorologists feed into models that produce marine weather forecasts. Those forecasts provide information on the state of the ocean as well as the changing locations of large currents like the Gulf Stream. Dangerous conditions can result when waves interact with such currents, putting ships at risk.
“Building on NASA’s long legacy of satellite altimetry data and its real-world impact on shipping operations, Sentinel-6B will soon take on the vital task of improving ocean and weather forecasts to help keep ships, their crews, and cargo safe”, said Nadya Vinogradova Shiffer, lead program scientist at NASA Headquarters in Washington.
Sentinel-6 Michael Freilich and Sentinel-6B are part of the Sentinel-6/Jason-CS (Continuity of Service) mission, the latest in a series of ocean-observing radar altimetry missions that have monitored Earth’s changing seas since the early 1990s. Sentinel-6/Jason-CS is a collaboration between NASA, ESA, the European Union, EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), and NOAA (U.S. National Oceanic and Atmospheric Administration). The European Commission provided funding support, and the French space agency CNES (Centre National d’Études Spatiales) contributed technical support.
Keeping current
“The ocean is getting busier, but it’s also getting more dangerous,” said Avichal Mehra, deputy director of the Ocean Prediction Center at the National Weather Service in College Park, Maryland. He and his colleagues produce marine weather forecasts using data from ocean-based instruments as well as complementary measurements from five satellites, including Sentinel-6 Michael Freilich. Among those measurements: sea level, wave height, and wind speed. The forecasters derive the location of large currents from changes in sea level.
One of the planet’s major currents, the Gulf Stream is located off the southeastern coast of the United States, but its exact position varies. “Ships will actually change course depending on where the Gulf Stream is and the direction of the waves,” said Mehra. “There have been instances where, in calm conditions, waves interacting with the Gulf Stream have caused damage or the loss of cargo containers on ships.”
Large, warm currents like the Gulf Stream can have relatively sharp boundaries since they are generally higher than their surroundings. Water expands as it warms, so warm seawater is taller than cooler water. If waves interact with these currents in a certain way, seas can become extremely rough, presenting a hazard to even the largest ships.
“Satellite altimeters are the only reliable measurement we have of where these big currents can be,” said Deirdre Byrne, sea surface height team lead at NOAA in College Park.
There are hundreds of floating sensors scattered about the ocean that could pick up parts of where such currents are located, but these instruments are widely dispersed and limited in the area they measure at any one time. Satellites like Sentinel-6B offer greater spatial coverage, measuring areas that aren’t regularly monitored and providing essential information for the forecasts that ships need.
Consistency is key
Sentinel-6B won’t just help marine weather forecasts through its near-real-time data, though. It will also extend a long-term dataset featuring more than 30 years of sea level measurements, just as Sentinel-6 Michael Freilich does today.
“Since 1992, we have launched a series of satellites that have provided consistent sea level observations from the same orbit in space. This continuity allows each new mission to be calibrated against its predecessors, providing measurements with centimeter-level accuracy that don’t drift over time,” said Severine Fournier, Sentinel-6B deputy project scientist at NASA’s Jet Propulsion Laboratory in Southern California.
This long-running, repeated measurement has turned this dataset into the gold standard sea level measurement from space — a reference against which data from other sea level satellites is checked. It also serves as a baseline, giving forecasters a way to tell what ocean conditions have looked like over time and how they are changing now. “This kind of data can’t be easily replaced,” said Mehra.
More about Sentinel-6B
Sentinel-6/Jason-CS was jointly developed by ESA, EUMETSAT, NASA, and NOAA, with funding support from the European Commission and technical support from CNES.
A division of Caltech in Pasadena, JPL contributed three science instruments for each Sentinel-6 satellite: the Advanced Microwave Radiometer, the Global Navigation Satellite System – Radio Occultation, and the Laser Retroreflector Array. NASA is also contributing launch services, ground systems supporting operation of the NASA science instruments, the science data processors for two of these instruments, and support for the U.S. members of the international Ocean Surface Topography and Sentinel-6 science teams.
For more about Sentinel-6/Jason-CS, visit:
https://sealevel.jpl.nasa.gov/missions/jason-cs-sentinel-6
News Media Contacts
Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
626-491-1943 / 626-379-6874
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov
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Last Updated Sep 11, 2025 Related Terms
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By NASA
NASA Stennis Buffer ZoneNASA / Stennis NASA’s Stennis Space Center is widely known for rocket propulsion testing, especially to support the NASA Artemis program to send astronauts to the Moon to prepare for future human exploration of Mars.
What may not be so widely known is that the site also is a unique federal city, home to more than 50 federal, state, academic, and commercial tenants and serving as both a model of government efficiency and a powerful economic engine for its region.
“NASA Stennis is a remarkable story of vision and innovation,” Center Director John Bailey said. “That was the case 55 years ago when the NASA Stennis federal city was born, and it remains the case today as we collaborate and grow to meet the needs of a changing aerospace world.”
Apollo Years
Nearly four years after its first Saturn V stage test, NASA’s Stennis Space Center faced a crossroads to the future. Indeed, despite its frontline role in supporting NASA’s Apollo lunar effort, it was not at all certain a viable future awaited the young rocket propulsion test site.
In 1961, NASA announced plans to build a sprawling propulsion test site in south Mississippi to support Apollo missions to the Moon. The news was a significant development for the sparsely populated Gulf Coast area.
The new site, located near Bay St. Louis, Mississippi, conducted its first hot fire of a Saturn V rocket stage in April 1966. Saturn V testing progressed steadily during the next years. In fall 1969, however, NASA announced an end to Apollo-related testing, leading to an existential crisis for the young test site.
What was to become of NASA Stennis?
An Expanded Vision
Some observers speculated the location would close or be reduced to caretaker status, with minimal staffing. Either scenario would deliver a serious blow to the families who had re-located to make way for the site and the local communities who had heavily invested in municipal projects to support the influx of workforce personnel.
Such outcomes also would run counter to assurances provided by leaders that the new test site would benefit its surrounding region and involve area residents in “something great.”
For NASA Stennis manager Jackson Balch and others, such a result was unacceptable. Anticipating the crisis, Balch had been working behind the scenes to communicate – and realize – the vision of a multiagency site supporting a range of scientific and technological tenants and missions.
A Pivotal Year
The months following the Saturn V testing announcement were filled with discussions and planning to ensure the future of NASA Stennis. The efforts began to come to fruition in 1970 with key developments:
In early 1970, NASA Administrator Thomas Paine proposed locating a regional environmental center at NASA Stennis. U.S. Sen. John C. Stennis (Mississippi) responded with a message of the president, “urgently requesting” that a National Earth Resources and Environmental Data Program be established at the site. In May 1970, President Richard Nixon offered assurances that an Earth Resources Laboratory would be established at NASA Stennis and that at least two agencies are preparing to locate operations at the site. U.S. congressional leaders earmarked $10 million to enable the location of an Earth Resources Laboratory at NASA Stennis. On July 9, 1970, the U.S. Coast Guard’s National Data Buoy Project (now the National Data Buoy Center) announced it was relocating to NASA Stennis, making it the first federal city tenant. The project arrived onsite two months later on September 9. On Sept. 9, 1970, NASA officially announced establishment of an Earth Resources Laboratory at NASA Stennis. Time to Grow
By the end of 1970, Balch’s vision was taking shape, but it needed time to grow. The final Saturn V test had been conducted in October – with no new campaign scheduled.
A possibility was on the horizon, however. NASA was building a reusable space shuttle vehicle. It would be powered by the most sophisticated rocket engine ever designed – and the agency needed a place to conduct developmental and flight testing expected to last for decades.
Three sites vied for the assignment. Following presentations and evaluations, NASA announced its selection on March 1, 1971. Space shuttle engine testing would be conducted at NASA Stennis, providing time for the location to grow.
A Collaborative Model
By the spring of 1973, preparations for the space shuttle test campaign were progressing and NASA Stennis was on its way to realizing the federal city vision. Sixteen agencies and universities were now located at NASA Stennis.
The resident tenants followed a shared model in which they shared in the cost of basic site services, such as medical, security, and fire protection. The shared model freed up more funding for the tenants to apply towards innovation and assigned mission work. It was a model of government collaboration and efficiency.
As the site grew, leaders then began to call for it to be granted independent status within NASA, a development not long in coming. On June 14, 1974, just more than a decade after site construction began, NASA Administrator James Fletcher announced the south Mississippi location would be renamed National Space Technology Laboratories and would enjoy equal, independent status alongside other NASA centers.
“Something Great”
For NASA Stennis leaders and supporters, independent status represented a milestone moment in their effort to ensure NASA Stennis delivered on its promise of greatness.
There still were many developments to come, including the first space shuttle main engine test and the subsequent 34-year test campaign, the arrival and growth of the U.S. Navy into the predominant resident presence onsite, the renaming of the center to NASA Stennis, and the continued growth of the federal city.
No one could have imagined it all at the time. However, even in this period of early development, one thing was clear – the future lay ahead, and NASA Stennis was on its way.
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Last Updated Sep 09, 2025 EditorNASA Stennis CommunicationsContactC. Lacy Thompsoncalvin.l.thompson@nasa.gov / (228) 688-3333LocationStennis Space Center Related Terms
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By NASA
NASA/Rachel Tilling Sea ice is frozen seawater that floats in the ocean. This photo, taken from NASA’s Gulfstream V Research Aircraft on July 21, 2022, shows Arctic sea ice in the Lincoln Sea north of Greenland.
This image is the NASA Science Image of the Month for September 2025. Each month, NASA’s Science Mission Directorate chooses an image to feature, offering desktop wallpaper downloads, as well as links to related topics, activities, and games.
Text and image credit: NASA/Rachel Tilling
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By European Space Agency
ESA Open Days 2025
Your chance to meet the European Space Agency
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By NASA
Titans Space Industries, a commercial space company, selected a new cohort of astronaut candidates this spring – and among them is NASA citizen scientist, Benedetta Facini. She has participated in not one, but many NASA citizen science projects: Cloudspotting on Mars, Active Asteroids, Daily Minor Planet, GLOBE, Exoasteroids and International Astronomical Collaboration (IASC). We asked her a few questions about her work with NASA and her path to becoming an astronaut candidate.
Benedetta Facini visiting Kennedy Space Center in 2023 Credit: B.F. Q: How did you learn about NASA Citizen Science?
A: Through colleagues and social media, I often came across people talking about Citizen Science, and this immediately caught my curiosity. I did some online research on the subject, and I asked some colleagues already involved in it. Finally, I managed to find the way to participate by exploring the programs offered by NASA Citizen Science, which impressed me with their variety.
Q: What would you say you have gained from working on these NASA projects?
A: Curiosity in discovering new things and a lot of patience: many projects indeed require attention and, as mentioned, patience. I was pleased to discover that even NASA relies on “ordinary people” to carry out research, giving them the opportunity to learn new things using simple tools.
I also gained hands-on experience in analyzing real data and identifying celestial objects to contribute to real research efforts. My favorite part was to learn to recognize the pattern of clouds in data collected by the Mars Climate Sounder on the Mars Reconnaissance Orbiter.
I have learned the importance of international collaboration: I know many citizen scientists now, and interacting with them teaches me a lot every day.
Q. What do you do when you’re not working on citizen science?
A: I am a student and a science communicator. I share my knowledge and enthusiasm through social media, schools, webinars around the world, and space festivals across Italy where I have the opportunity to engage with a wide audience, from young students to adults.
Recently, I achieved a major milestone: I was selected as an Astronaut Candidate by the commercial space company, Titans Space Industries. I am thrilled to soon begin the basic training, which marks the first step toward realizing my dream of becoming an astronaut and contributing directly to human spaceflight and scientific research.
Q. What do you need to do to become an astronaut?
A: Gain as much experience as possible. During astronaut selection, not only academic achievements are evaluated, but also professional and personal experiences.
Every skill can be useful during the selection process: the ability to work in a team, which is essential during space missions; survival skills; experience as a diver, skydiver, or pilot; knowledge of other languages; and the ability to adapt to different situations.
I would also like to debunk a myth: you don’t need to be Einstein and fit as an Olympic level athlete; you just need to be good at what you do and be healthy.
Q: How has citizen science helped you with your career?
A: Citizen Science was very helpful for my career as a science communicator, as it gave me the opportunity to show people that anyone can contribute to the space sector. At the same time, it has allowed me to become a mentor and a point of reference for many students (mainly with the IASC project).
The hands-on experience I gained in analyzing real data was also very helpful for my academic career, too. I had never had real data to work with before, and this experience proved extremely valuable for the practical courses in my physics degree program.
Q. Do you have any advice you’d like to share for other citizen scientists or for people who want to become astronauts?
A: For other citizen scientists my advice is to stay curious and persistent.
Don’t be afraid to ask for help and interact with other colleagues because the goal of the NASA Citizen Science program is international collaboration and every small contribution can make a difference.
For aspiring astronauts, my advice is to gain as much experience as possible. Academic results are important but hands-on skills, teamwork, adaptability, and real experiences are also important.
Stay passionate and never lose your curiosity; the astronaut path is challenging; don’t give up after an eventual first rejection. You will always meet people trying to make you change your mind and your dream, even people from your family, but don’t stop in front of obstacles. The greatest regret is knowing you didn’t try to make your dream come true.
Quoting my inspiration, Italian astronaut Paolo Nespoli: “You need to have the ability and the courage to dream of impossible things. Everyone can dream of things that are possible. Dream of something impossible, one of those things that, when you say it out loud, people look at you and say: “Sure, study hard and you’ll make it,” but deep down no one really believes it. Those are the impossible things that are worth trying to do!”
Q: Thank you for sharing your story with us! Is there anything else you would like to add?
A: I would like to thank the team behind NASA Citizen Science.
These projects play a crucial role in keeping students’ passion for science alive and guiding them toward a potential career in this field.
Knowing that I have contributed to helping scientists is incredibly motivating and encourages me and students around the world to keep going, stay curious, and continue pursuing our path in the science field.
The opportunity to participate in these projects while learning is inspiring and it reinforces the idea that everyone, regardless of their background, can make a real impact in the scientific community.
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Last Updated Aug 25, 2025 Related Terms
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