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By NASA
NASA/Aubrey Gemignani A SpaceX Falcon 9 rocket carrying the SpaceX Dragon spacecraft Endeavour lifts off from Launch Complex 39A at NASA’s Kennedy Space Center in Florida on Aug. 1, 2025. NASA astronauts Zena Cardman and Mike Fincke, JAXA (Japan Aerospace Exploration Agency) astronaut Kimiya Yui, and Roscosmos cosmonaut Oleg Platonov are aboard the spacecraft. After the crew arrives at the International Space Station, they will perform research, technology demonstrations, and maintenance activities aboard the orbiting laboratory. Crew-11 will also contribute to NASA’s Artemis campaign by simulating Moon landing scenarios that astronauts may encounter near the lunar South Pole, showing how the space station helps prepare crews for deep space human exploration.
The flight is the 11th crew rotation mission with SpaceX to the space station as part of NASA’s Commercial Crew Program.
Image credit: NASA/Aubrey Gemignani
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By NASA
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
Europa Clipper’s radar instrument received echoes of its very-high-frequency radar signals that bounced off Mars and were processed to develop this radargram. What looks like a skyline is the outline of the topography beneath the spacecraft.NASA/JPL-Caltech/UT-Austin The agency’s largest interplanetary probe tested its radar during a Mars flyby. The results include a detailed image and bode well for the mission at Jupiter’s moon Europa.
As it soared past Mars in March, NASA’s Europa Clipper conducted a critical radar test that had been impossible to accomplish on Earth. Now that mission scientists have studied the full stream of data, they can declare success: The radar performed just as expected, bouncing and receiving signals off the region around Mars’ equator without a hitch.
Called REASON (Radar for Europa Assessment and Sounding: Ocean to Near-surface), the radar instrument will “see” into Europa’s icy shell, which may have pockets of water inside. The radar may even be able to detect the ocean beneath the shell of Jupiter’s fourth-largest moon.
“We got everything out of the flyby that we dreamed,” said Don Blankenship, principal investigator of the radar instrument, of the University of Texas at Austin. “The goal was to determine the radar’s readiness for the Europa mission, and it worked. Every part of the instrument proved itself to do exactly what we intended.”
In this artist’s concept, Europa Clipper’s radar antennas — seen at the lower edge of the solar panels — are fully deployed. The antennas are key components of the spacecraft’s radar instrument, called REASON.NASA/JPL-Caltech The radar will help scientists understand how the ice may capture materials from the ocean and transfer them to the surface of the moon. Above ground, the instrument will help to study elements of Europa’s topography, such as ridges, so scientists can examine how they relate to features that REASON images beneath the surface.
Limits of Earth
Europa Clipper has an unusual radar setup for an interplanetary spacecraft: REASON uses two pairs of slender antennas that jut out from the solar arrays, spanning a distance of about 58 feet (17.6 meters). Those arrays themselves are huge — from tip to tip, the size of a basketball court — so they can catch as much light as possible at Europa, which gets about 1/25th the sunlight as Earth.
The instrument team conducted all the testing that was possible prior to the spacecraft’s launch from NASA’s Kennedy Space Center in Florida on Oct. 14, 2024. During development, engineers at the agency’s Jet Propulsion Laboratory in Southern California even took the work outdoors, using open-air towers on a plateau above JPL to stretch out and test engineering models of the instrument’s spindly high-frequency and more compact very-high-frequency antennas.
But once the actual flight hardware was built, it needed to be kept sterile and could be tested only in an enclosed area. Engineers used the giant High Bay 1 clean room at JPL, where the spacecraft was assembled, to test the instrument piece by piece. To test the “echo,” or the bounceback of REASON’s signals, however, they’d have needed a chamber about 250 feet (76 meters) long — nearly three-quarters the length of a football field.
Enter Mars
The mission’s primary goal in flying by Mars on March 1, less than five months after launch, was to use the planet’s gravitational pull to reshape the spacecraft’s trajectory. But it also presented opportunities to calibrate the spacecraft’s infrared camera and perform a dry run of the radar instrument over terrain NASA scientists have been studying for decades.
As Europa Clipper zipped by the volcanic plains of the Red Planet — starting at 3,100 miles (5,000 kilometers) down to 550 miles (884 kilometers) above the surface — REASON sent and received radio waves for about 40 minutes. In comparison, at Europa the instrument will operate as close as 16 miles (25 kilometers) from the moon’s surface.
All told, engineers were able to collect 60 gigabytes of rich data from the instrument. Almost immediately, they could tell REASON was working well. The flight team scheduled the full dataset to download, starting in mid-May. Scientists relished the opportunity over the next couple of months to examine the information in detail and compare notes.
“The engineers were excited that their test worked so perfectly,” said JPL’s Trina Ray, Europa Clipper deputy science manager. “All of us who had worked so hard to make this test happen — and the scientists seeing the data for the first time — were ecstatic, saying, ‘Oh, look at this! Oh, look at that!’ Now, the science team is getting a head start on learning how to process the data and understand the instrument’s behavior compared to models. They are exercising those muscles just like they will out at Europa.”
Europa Clipper’s total journey to reach the icy moon will be about 1.8 billion miles (2.9 billion kilometers) and includes one more gravity assist — using Earth — in 2026. The spacecraft is currently about 280 million miles (450 million kilometers) from Earth.
More About Europa Clipper
Europa Clipper’s three main science objectives are to determine the thickness of the moon’s icy shell and its interactions with the ocean below, to investigate its composition, and to characterize its geology. The mission’s detailed exploration of Europa will help scientists better understand the astrobiological potential for habitable worlds beyond our planet.
Managed by Caltech in Pasadena, California, NASA’s Jet Propulsion Laboratory in Southern California leads the development of the Europa Clipper mission in partnership with the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, for NASA’s Science Mission Directorate in Washington. APL designed the main spacecraft body in collaboration with JPL and NASA’s Goddard Space Flight Center in Greenbelt, Maryland, NASA’s Marshall Space Flight Center in Huntsville, Alabama, and Langley Research Center in Hampton, Virginia. The Planetary Missions Program Office at NASA Marshall executes program management of the Europa Clipper mission. NASA’s Launch Services Program, based at NASA Kennedy, managed the launch service for the Europa Clipper spacecraft. The REASON radar investigation is led by the University of Texas at Austin.
Find more information about Europa Clipper here:
https://science.nasa.gov/mission/europa-clipper/
Check out Europa Clipper's Mars flyby in 3D News Media Contacts
Gretchen McCartney
Jet Propulsion Laboratory, Pasadena, Calif.
818-287-4115
gretchen.p.mccartney@jpl.nasa.gov
Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.govt
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Last Updated Aug 01, 2025 Related Terms
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By NASA
A SpaceX Falcon 9 rocket carrying the company’s Dragon spacecraft is launched on NASA’s SpaceX Crew-11 mission to the International Space Station with NASA astronauts Zena Cardman, Mike Fincke, JAXA (Japan Aerospace Exploration Agency) astronaut Kimiya Yui, and Roscosmos cosmonaut Oleg Platonov onboard, Friday, Aug. 1, 2025, from NASA’s Kennedy Space Center in Florida. NASA’s SpaceX Crew-11 mission is the eleventh crew rotation mission of the SpaceX Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency’s Commercial Crew Program. Cardman, Fincke, Yui, Platonov launched at 11:43 a.m. EDT from Launch Complex 39A at the NASA’s Kennedy Space Center to begin a six month mission aboard the orbital outpost. Credit: NASA/Aubrey Gemignani Four crew members of NASA’s SpaceX Crew-11 mission launched at 11:43 a.m. EDT Friday from Launch Complex 39A at the agency’s Kennedy Space Center in Florida for a science expedition aboard the International Space Station.
A SpaceX Falcon 9 rocket propelled the Dragon spacecraft into orbit carrying NASA astronauts Zena Cardman and Mike Fincke, JAXA (Japan Aerospace Exploration Agency) astronaut Kimiya Yui, and Roscosmos cosmonaut Oleg Platonov. The spacecraft will dock autonomously to the space-facing port of the station’s Harmony module at approximately 3 a.m. on Saturday, Aug. 2.
“Thanks to the bold leadership of President Donald J. Trump, NASA is back! The agency’s SpaceX Crew-11 mission to the space station is the first step toward our permanent presence on the Moon. NASA, in conjunction with great American companies, continues the mission with Artemis in 2026. This Moon mission will ensure America wins the space race – critical to national security – and leads in the emerging, exciting and highly profitable private sector commercial space business,” said acting NASA Administrator Sean Duffy. “The Commercial Crew Program and Artemis missions prove what American ingenuity, and cutting-edge American manufacturing can achieve. We’re going to the Moon…to stay! After that, we go to Mars! Welcome to the Golden Age of exploration!”
During Dragon’s flight, SpaceX will monitor a series of automatic spacecraft maneuvers from its mission control center in Hawthorne, California. NASA will monitor space station operations throughout the flight from the Mission Control Center at the agency’s Johnson Space Center in Houston.
NASA’s live coverage resumes at 1 a.m., Aug. 2, on NASA+ with rendezvous, docking, and hatch opening. After docking, the crew will change out of their spacesuits and prepare cargo for offload before opening the hatch between Dragon and the space station’s Harmony module around 4:45 a.m. Once the new crew is aboard the orbital outpost, NASA will provide coverage of the welcome ceremony beginning at approximately 5:45 a.m.
Learn how to watch NASA content through a variety of platforms, including social media.
The number of crew aboard the space station will increase to 11 for a short time as Crew-11 joins NASA astronauts Anne McClain, Nichole Ayers, and Jonny Kim, JAXA astronaut Takuya Onishi, and Roscosmos cosmonauts Kirill Peskov, Sergey Ryzhikov, and Alexey Zubritsky.
NASA’s SpaceX Crew-10 will depart the space station after the arrival of Crew-11 and a handover period. Ahead of Crew-10’s return, mission teams will review weather conditions at the splashdown sites off the coast of California prior to departure from station.
During their mission, Crew-11 will conduct scientific research to prepare for human exploration beyond low Earth orbit and benefit humanity on Earth. Participating crew members will simulate lunar landings, test strategies to safeguard vision, and advance other human spaceflight studies led by NASA’s Human Research Program. The crew also will study plant cell division and microgravity’s effects on bacteria-killing viruses, as well as perform experiments to produce a higher volume of human stem cells and generate on-demand nutrients.
The mission is part of NASA’s Commercial Crew Program, which provides reliable access to space, maximizing the use of the station for research and development and supporting future missions beyond low Earth orbit by partnering with private companies to transport astronauts to and from the space station.
Learn more about the agency’s Commercial Crew Program at:
https://www.nasa.gov/commercialcrew
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Josh Finch / Claire O’Shea
Headquarters, Washington
202-358-1100
joshua.a.finch@nasa.gov / claire.a.o’shea@nasa.gov
Steven Siceloff
Kennedy Space Center, Florida
321-867-2468
steven.p.siceloff@nasa.gov
Sandra Jones
Johnson Space Center, Houston
281-483-5111
sandra.p.jones@nasa.gov
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By NASA
NASA Astronaut Kate RubinsNASA NASA astronaut and microbiologist Kate Rubins retired Monday after 16 years with the agency. During her time with NASA, Rubins completed two long-duration missions aboard the International Space Station, logging 300 days in space and conducting four spacewalks.
“I want to extend my sincere gratitude to Kate for her dedication to the advancement of human spaceflight,” said Steve Koerner, acting director of NASA’s Johnson Space Center in Houston. “She is leaving behind a legacy of excellence and inspiration, not only to our agency, but to the research and medical communities as well. Congratulations, Kate, on an extraordinary career.”
Rubins’ first mission to the orbiting laboratory began in July 2016, aboard the first test flight of the new Soyuz MS spacecraft. As part of Expedition 48/49, she contributed to more than 275 scientific experiments, including molecular and cellular biology research, and she was the first person to sequence DNA in space. Her work enabled significant advances with in-flight molecular diagnostics, long-duration cell culture, and the development of molecular biology tools and processes, such as handling and transferring small amounts of liquids in microgravity. Rubins also led the integration and deployment of biomedical hardware aboard the space station, supporting crew health and scientific research in space and on Earth.
She again launched in October 2020, aboard a Soyuz spacecraft from the Baikonur Cosmodrome in Kazakhstan, taking part in Expedition 63/64. Alongside her crewmates, Rubins spent hundreds of hours working on new experiments and furthering research investigations conducted during her mission, including heart research and multiple microbiology studies. She also advanced her work on DNA sequencing in space, which could allow future astronauts to diagnose illness or identify microbes growing aboard the station or during future exploration missions.
“From her groundbreaking work in space to her leadership on the ground, Kate has brought passion and excellence to everything she’s done,” said Joe Acaba, chief of the Astronaut Office at NASA Johnson. “She’s been an incredible teammate and role model. We will miss her deeply, but her impact will continue to inspire.”
In addition to her flight assignments, Rubins served as acting deputy director of NASA’s Human Health and Performance Directorate, where she helped guide strategy for crew health and biomedical research. More recently, she contributed to developing next-generation lunar spacesuits, helping prepare for future Artemis missions to the Moon.
Before her selection as an astronaut in 2009, Rubins received a bachelor’s degree in molecular biology from the University of California, San Diego, and a doctorate in cancer biology from Stanford University Medical School’s Biochemistry Department and Microbiology and Immunology Department. After returning from her second space mission, Rubins commissioned as a major in the U.S. Army Reserve, serving as a microbiologist in the Medical Service Corps. She currently holds the role of innovation officer with the 75th U.S. Army Reserve Innovation Command’s MedBio Detachment, headquartered in Boston.
A frequent keynote speaker at scientific, educational, and industry events on space biology, biomedical engineering, and human exploration, Rubins has advocated for NASA’s scientific and exploration missions. As she transitions from government service, she remains committed to advancing innovation at the intersection of biology, technology, and space.
“It has been the honor of a lifetime to live and work in space,” said Rubins. “I am grateful for the extraordinary advances at NASA, and it was a privilege to serve and contribute to something so meaningful. The mission of exploration continues, and I can’t wait to watch this nation do what once seemed impossible.”
Learn more about how NASA explores the unknown and innovates for the benefit of humanity at:
https://www.nasa.gov/
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Raegan Scharfetter
Johnson Space Center, Houston
281-910-4989
raegan.r.scharfetter@nasa.gov
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By NASA
As part of her Summer Reading Challenge, Second Lady Usha Vance will host an event for children in grades K-8 on Monday, Aug. 4, at NASA’s Johnson Space Center in Houston.Credit: White House As part of her Summer Reading Challenge, Second Lady Usha Vance will host an event for children in grades K-8 on Monday, Aug. 4, at NASA’s Johnson Space Center in Houston. Media are invited.
NASA astronaut Suni Williams will join Ms. Vance to read a space-related book to children and participate in other space-related activities.
Live coverage of the reading will stream about 2:45 p.m. EDT on NASA+. Learn how to watch NASA content through a variety of platforms, including social media.
U.S. media interested in participating in this event must RSVP to NASA Press Secretary Bethany Stevens at: bethany.c.stevens@nasa.gov, as well as Office of the Second Lady Communications Director Nicole Reeves at: nicole.e.reeves@ovp.eop.gov. Requests must be made no later than 1 p.m. EDT on Thursday, July 31. Confirmed media will receive additional details from NASA. The agency’s media accreditation policy is online.
Through her reading challenge, the Second Lady is encouraging youth to seek adventure, imagination, and discovery between the pages of a book. Students interested in participating in the challenge must read 12 books by Friday, Sept. 5. Additional details, including where to download a reading log, and how to submit it to the White House, are available online.
As part of NASA’s Artemis campaign, the agency will send astronauts to the Moon to prepare for future human exploration of Mars, inspiring Golden Age explorers, and ensuring the United States continues to lead in space exploration and discovery.
Learn more about NASA missions online at:
https://www.nasa.gov
-end-
Bethany Stevens / Cheryl Warner
Headquarters, Washington
202-358-1600
bethany.c.stevens@nasa.gov / cheryl.m.warner@nasa.gov
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Last Updated Jul 28, 2025 LocationNASA Headquarters Related Terms
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