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By NASA
Dr. Steven “Steve” Platnick took the NASA agency Deferred Resignation Program (DRP). His last work day was August 8, 2025. Steve spent more than three decades at, or associated with, NASA. While he began his civil servant career at the NASA’s Goddard Space Flight Center (GSFC) in 2002, his Goddard association went back to 1993, first as a contractor and then as one of the earliest employees of the Joint Center for Earth Systems Technology (JCET), a cooperative agreement between the University of Maryland, Baltimore County (UMBC) and GSFC’s Earth Science Division. At JCET Steve helped lead the development of the Atmosphere Physics Track curricula. Previously, he had held an NRC post-doctoral fellow at the NASA’s Ames Research Center. Along with his research work on cloud remote sensing from satellite and airborne sensors, Steve served as the Deputy Director for Atmospheres in GSFC’s Earth Sciences Division from January 2015–July 2024.
Dr. Steve Platnick Image credit: NASA During his time at NASA, Steve played an integral role in the sustainability and advancement of NASA’s Earth Observing System platforms and data. In 2008, he took over as the Earth Observing System (EOS) Senior Project Scientist from Michael King. In this role, he led the EOS Project Science Office, which included support for related EOS facility airborne sensors, ground networks, and calibration labs. The office also supported The Earth Observer newsletter, the NASA Earth Observatory, and other outreach and exhibit activities on behalf of NASA Headquarter’s Earth Science Division and Science Mission Directorate (further details below). From January 2003 – February 2010, Steve served as the Aqua Deputy Project Scientist.
Improving Imager Cloud Algorithms
Steve was actively involved in the Moderate Resolution Imaging Spectroradiometer (MODIS) Science Team serving as the Lead for the MODIS Atmosphere Discipline Team (cloud, aerosol and clear sky products) since 2008 and as the NASA Suomi National Polar-orbiting Partnership (Suomi NPP)/JPSS Atmosphere Discipline Lead/co-Lead from 2012–2020. His research team enhanced, maintained, and evaluated MODIS and Visible Infrared Imaging Radiometer Suite (VIIRS) cloud algorithms that included Level-2 (L2) Cloud Optical/Microphysical Properties components (MOD06 and MYD06 for MODIS on Terra and Aqua, respectively) and the Atmosphere Discipline Team Level-3 (L3) spatial/temporal products (MOD08, MYD08). The L2 cloud algorithms were developed to retrieve thermodynamic phase, optical thickness, effective particle radius, and derived water path for liquid and ice clouds, among other associated datasets. Working closely with longtime University of Wisconsin-Madison colleagues, the team also developed the CLDPROP continuity products designed to bridge the MODIS and VIIRS cloud data records by addressing differences in the spectral coverage between the two sensors; this product is currently in production for VIIRS on Suomi NPP and NOAA-20, as well as MODIS Aqua. The team also ported their CLDPROP code to Geostationary Operational Environmental Satellites (GOES) R-series Advanced Baseline Imager (ABI) and sister sensors as a research demonstration effort.
Steve’s working group participation included the Global Energy and Water Exchanges (GEWEX) Cloud Assessment Working Group (2008–present); the International Cloud Working Group (ICWG), which is part of the Coordination Group for Meteorological Satellites (CGMS), and its original incarnation, the Cloud Retrieval Evaluation Working (CREW) since 2009; and the NASA Observations for Modeling Intercomparison Studies (obs4MIPs) Working Group (2011–2013). Other notable roles included Deputy Chair of the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) Science Definition Team (2011–2012) and membership in the Advanced Composition Explorer (ACE) Science Definition Team (2009–2011), the ABI Cloud Team (2005–2009), and the Climate Absolute Radiance and Refractivity Observatory (CLARREO) Mission Concept Team (2010-2011).
Steve has participated in numerous major airborne field campaigns over his career. His key ER-2 flight scientist and/or science team management roles included the Monterey Area Ship Track experiment (MAST,1994), First (International Satellite Cloud Climatology Project (ISCCP) Regional Experiment – Arctic Cloud Experiment [FIRE-ACE, 1998], Southern Africa Fire-Atmosphere Research Initiative (SAFARI-2000), Cirrus Regional Study of Tropical Anvils and Cirrus Layers – Florida Area Cirrus Experiment (CRYSTAL-FACE, 2002), and Tropical Composition, Cloud and Climate Coupling (TC4, 2007).
Supporting Earth Science Communications
Through his EOS Project Science Office role, Steve has been supportive of the activities of NASA’s Science Support Office (SSO) and personally participated in many NASA Science exhibits at both national and international scientific conferences, including serving as a Hyperwall presenter numerous times.
For The Earth Observer newsletter publication team in particular, Steve replaced Michael King as Acting EOS Senior Project Scientist in June 2008, taking over the authorship of “The Editor’s Corner” beginning with the May–June 2008 issue [Volume 20, Issue 3]. The Acting label was removed beginning with the January–February 2010 issue [Volume 22, Issue 1]. Steve has been a champion of continuing to retain a historical record of NASA science team meetings to maintain a chronology of advances made by different groups within the NASA Earth Science community. He was supportive of the Executive Editor’s efforts to create a series called “Perspectives on EOS,” which ran from 2008–2011 and told the stories of the early years of the EOS Program from the point of view of those who lived them. He also supported the development of articles to commemorate the 25th and 30th anniversary of The Earth Observer. Later, Steve helped guide the transition of the newsletter from a print publication – the November–December 2022 issue was the last printed issue – to fully online by July 2024, a few months after the publication’s 35th anniversary. The Earth Observer team will miss Steve’s keen insight, historical perspective, and encouragement that he has shown through his leadership for the past 85 issues of print and online publications.
A Career Recognized through Awards and Honors
Throughout his career, Steve has amassed numerous honors, including the Goddard William Nordberg Memorial Award for Earth Science in 2023 and the Verner E. Suomi Award from the American Meteorological Society (AMS) in 2016. He was named an AMS Fellow that same year. He received two NASA Agency Honor Awards – the Exceptional Achievement Medal in 2008 and the Exceptional Service Medal in 2015.
Steve received his bachelor’s degree and master’s degree in electrical engineering from Duke University and the University of California, Berkeley, respectively. He earned a Ph.D. in atmospheric sciences from the University of Arizona.
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By NASA
NASA/Keegan Barber The members of NASA’s SpaceX Crew-10 mission – Roscosmos cosmonaut Kirill Peskov, left, NASA astronauts Nichole Ayers and Anne McClain, and JAXA (Japan Aerospace Exploration Agency) astronaut Takuya Onishi – are all smiles after having landed in the Pacific Ocean off the coast of San Diego, Calif., Saturday, Aug. 9, 2025. The crew spent seven months aboard the International Space Station.
Along the way, Crew-10 contributed hundreds of hours to scientific research, maintenance activities, and technology demonstrations. McClain, Ayers, and Onishi completed investigations on plant and microalgae growth, examined how space radiation affects DNA sequences in plants, observed how microgravity changes human eye structure and cells in the body, and more. The research conducted aboard the orbiting laboratory advances scientific knowledge and demonstrates new technologies that enable us to prepare for human exploration of the Moon and Mars.
McClain and Ayers also completed a spacewalk on May 1. It was the third spacewalk for McClain and the first for Ayers.
See more photos from Crew-10 Splashdown.
Image credit: NASA/Keegan Barber
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By NASA
The SpaceX Crew Dragon Endurance spacecraft is seen as it lands with NASA astronauts Anne McClain and Nichole Ayers, JAXA (Japan Aerospace Exploration Agency) astronaut Takuya Onishi, and Roscosmos cosmonaut Kirill Peskov aboard in the Pacific Ocean off the coast of San Diego, Saturday, Aug. 9, 2025.Credit: NASA/Keegan Barber The first crew to splash down in the Pacific Ocean off the coast of California as part of NASA’s Commercial Crew Program completed the agency’s 10th commercial crew rotation mission to the International Space Station on Saturday.
NASA astronauts Anne McClain and Nichole Ayers, JAXA (Japan Aerospace Exploration Agency) astronaut Takuya Onishi, and Roscosmos cosmonaut Kirill Peskov returned to Earth at 11:33 a.m. EDT. Teams aboard SpaceX recovery vessels retrieved the spacecraft and its crew. After returning to shore, the crew will fly to NASA’s Johnson Space Center in Houston and reunite with their families.
“Splashdown! Crew-10 is back on Earth from the International Space Station marking the completion of another successful flight,” said NASA acting Administrator Sean Duffy. “Our crew missions are the building blocks for long-duration, human exploration pushing the boundaries of what’s possible. NASA is leading the way by setting a bold vision for exploration where we have a thriving space industry supporting private space stations in low Earth orbit, as well as humans exploring the Moon and Mars.”
The agency’s SpaceX Crew-10 mission lifted off at 7:03 p.m. on March 14, from Launch Complex 39A at NASA’s Kennedy Space Center in Florida. About 29 hours later, the crew’s SpaceX Dragon spacecraft docked to the Harmony module’s space-facing port at 12:04 a.m. on March 16. Crew-10 undocked at 6:15 p.m. Aug. 8, to begin the trip home.
During their mission, crew members traveled nearly 62,795,205 million miles and completed 2,368 orbits around Earth. The Crew-10 mission was the first spaceflight for Ayers and Peskov, and the second spaceflight for McClain and Onishi. McClain has logged 352 days in space over her two flights, and Onishi has logged 263 days in space during his flights.
Along the way, Crew-10 contributed hundreds of hours to scientific research, maintenance activities, and technology demonstrations. McClain, Ayers, and Onishi completed investigations on plant and microalgae growth, examined how space radiation affects DNA sequences in plants, observed how microgravity changes human eye structure and cells in the body, and more. The research conducted aboard the orbiting laboratory advances scientific knowledge and demonstrates new technologies that enable us to prepare for human exploration of the Moon and Mars.
McClain and Ayers also completed a spacewalk on May 1, relocating a communications antenna, beginning the installation of a mounting bracket for a future International Space Station Roll-Out Solar Array, and other tasks. It was the third spacewalk for McClain, the first for Ayers, and the 275th supporting space station assembly, maintenance, and upgrades.
Crew-10’s return to Earth follows the Crew-11 mission, which docked to the station on Aug. 2 for its long-duration science expedition.
NASA’s Commercial Crew Program provides reliable access to space, maximizing the use of the International Space Station for research and development, and supporting future missions beyond low Earth orbit, such as to the Moon and Mars, by partnering with private U.S. companies, including SpaceX, to transport astronauts to and from the space station.
Learn more about NASA’s Commercial Crew Program at:
https://www.nasa.gov/commercialcrew
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Joshua Finch / Jimi Russell
Headquarters, Washington
202-358-1100
joshua.a.finch@nasa.gov / james.j.russell@nasa.gov
Sandra Jones / Joseph Zakrzewski
Johnson Space Center, Houston
281-483-5111
sandra.p.jones@nasa.gov / joseph.a.zakrzewski@nasa.gov
Steven Siceloff
Kennedy Space Center, Florida
321-867-2468
steven.p.siceloff@nasa.gov
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Last Updated Aug 09, 2025 LocationNASA Headquarters Related Terms
International Space Station (ISS) Commercial Crew Humans in Space ISS Research View the full article
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By NASA
The SpaceX Dragon spacecraft carrying the Axiom Mission 4 crew launches atop the Falcon 9 rocket from NASA’s Kennedy Space Center to the International Space Station.Credit: NASA As part of NASA’s efforts to expand access to space, four private astronauts are in orbit following the successful launch of the fourth all private astronaut mission to the International Space Station.
A SpaceX Dragon spacecraft lifted off at 2:31 a.m. EDT Wednesday from Launch Complex 39A at NASA’s Kennedy Space Center in Florida, carrying Axiom Mission 4 crew members Peggy Whitson, former NASA astronaut and director of human spaceflight at Axiom Space as commander, ISRO (Indian Space Research Organisation) astronaut and pilot Shubhanshu Shukla, and mission specialists ESA (European Space Agency) project astronaut Sławosz Uznański-Wiśniewski of Poland and HUNOR (Hungarian to Orbit) astronaut Tibor Kapu of Hungary.
“Congratulations to Axiom Space and SpaceX on a successful launch,” said NASA acting Administrator Janet Petro. “Under President Donald Trump’s leadership, America has expanded international participation and commercial capabilities in low Earth orbit. U.S. industry is enabling astronauts from India, Poland, and Hungary to return to space for the first time in over forty years. It’s a powerful example of American leadership bringing nations together in pursuit of science, discovery, and opportunity.”
A collaboration between NASA and ISRO allowed Axiom Mission 4 to deliver on a commitment highlighted by President Trump and Indian Prime Minister Narendra Modi to send the first ISRO astronaut to the station. The space agencies are participating in five joint science investigations and two in-orbit science, technology, engineering, and mathematics demonstrations. NASA and ISRO have a long-standing relationship built on a shared vision to advance scientific knowledge and expand space collaboration.
This mission serves as an example of the success derived from collaboration between NASA’s international partners and American commercial space companies.
Live coverage of the spacecraft’s arrival will begin at 5 a.m., Thursday, June 26, on NASA+. Learn how to watch NASA content through a variety of platforms, including social media.
The spacecraft is scheduled to autonomously dock at approximately 7 a.m. to the space-facing port of the space station’s Harmony module.
Once aboard the station, Expedition 73 crew members, including NASA astronauts, Nicole Ayers, Anne McClain, and Jonny Kim, JAXA (Japan Aerospace Exploration Agency) astronaut Takuya Onishi, and Roscosmos cosmonauts Kirill Peskov, Sergey Ryzhikov, and Alexey Zubritsky will welcome the astronauts.
The crew is scheduled to remain at the space station, conducting microgravity research, educational outreach, and commercial activities for about two weeks before a return to Earth and splashdown off the coast of California.
The International Space Station is a springboard for developing a low Earth economy. NASA’s goal is to achieve a strong economy off the Earth where the agency can purchase services as one of many customers to meet its science and research objectives in microgravity. NASA’s commercial strategy for low Earth orbit provides the government with reliable and safe services at a lower cost, empowers U.S. industry, and enables the agency to focus on Artemis missions to the Moon in preparation for Mars while also continuing to use low Earth orbit as a training and proving ground for those deep space missions.
Learn more about NASA’s commercial space strategy at:
https://www.nasa.gov/commercial-space
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Josh Finch
Headquarters, Washington
202-358-1100
joshua.a.finch@nasa.gov
Anna Schneider
Johnson Space Center, Houston
281-483-5111
anna.c.schneider@nasa.gov
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Last Updated Jun 25, 2025 LocationNASA Headquarters Related Terms
Commercial Crew Commercial Space Humans in Space International Space Station (ISS) ISS Research Johnson Space Center View the full article
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