Acting Center Chief Technologist Dr. Phillip Williams

Acting Center Chief Technologist Dr. Phillip Williams

Acting Center Chief Technologist Dr. Phillip A. Williams holds up a model and smiles at the camera. A NASA meatball logo can be seen in the background.

“I did not know that NASA Langley was right here in my own backyard. I was born and raised in Portsmouth, Virginia, and NASA Langley is in Hampton, about 45 minutes away. All throughout elementary school, I didn’t know that NASA was here. I always thought NASA was in Florida or Texas or somewhere.

“I was in this summer program [in eighth grade], learning physics at the university. I vividly remember we had a guest speaker. He was an African American mechanical engineer and he had on the blue flight suit. And he said he worked at NASA, and it just blew my mind.

“And at that point, I saw myself in him. I didn’t even know that NASA was here, so close to me, and I hadn’t seen anybody who had ever worked there. So that left a mark in my mind: ‘Wow, NASA is here.’

“… When I was in college, I came back to my high school to talk to a class about majoring in physics. And there was a student, maybe two years under me. I remember meeting her. I remember interacting. I remember talking with her just briefly at this career fair event.

“I found out years later that seeing me in high school and hearing my experience in college inspired her to major in physics, and so she became the first robotics director at her school. And now she’s a principal. And it just rocked me because I was just being me and trying to share. It seemed like I paid it forward the same way that NASA mechanical engineer made a mark on me.”

— Dr. Phillip Williams, Acting Center Chief Technologist, NASA’s Langley Research Center

Image Credit: NASA/Mark Knopp
Interviewer: NASA/Thalia Patrinos

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Thalia K. Patrinos

Voyagers of Mars: The First CHAPEA Crew’s Yearlong Journey 

Voyagers of Mars: The First CHAPEA Crew’s Yearlong Journey 

When the first humans travel to the Red Planet, they will need to know how to repair and maintain equipment, grow their own food, and stay healthy, all while contending with Earth-to-Mars communication delays. They must also find ways to build comradery and have fun. 

The first all-volunteer CHAPEA (Crew Health and Performance Exploration Analog) crew accomplished all of that and more during their 378-day analog mission on the surface of Mars.  

Living in the isolated Mars Dune Alpha, a 3D-printed, 1,700-square-foot habitat, crew members Kelly Haston, Ross Brockwell, Nathan Jones, and Anca Selariu faced the rigors of a simulated Mars expedition, enduring stressors akin to those of a real mission to the Red Planet. They also celebrated holidays and birthdays, gave each other haircuts, and found moments of levity in isolation. Their journey will help scientists understand the challenges of deep space missions and offer invaluable insights into the resilience of the human spirit. 

A woman in a black NASA jumpsuit is shaking hands with a man in a blue NASA astronaut suit. Another man in a blue suit is clapping. They are standing at the entrance of a building with NASA logos and other mission patches on the wall.
NASA’s CHAPEA (Crew Health and Performance Exploration Analog) crew member Kelly Haston greets Deputy Director of Flight Operations Kjell Lindgren and Johnson Space Center Deputy Director Stephen Koerner at the habitat’s door.
NASA/Josh Valcarcel

As the crew concluded their journey on July 6, NASA astronaut and Deputy Director of Flight Operations Kjell Lindgren opened the habitat door and welcomed them home. 

“The crew and their families have committed a year of their lives in service to NASA, the country, and humanity’s exploration of space. Thank you to for committing yourselves to research that will enable our future exploration of space,” he said. “Your fingerprints are going to be an indelible part of those first footprints on Mars.” 

The CHAPEA crew brought their diverse backgrounds and experiences to the mission, collaborating with NASA’s scientists and engineers to collect data that will provide insight into maintaining crew health and performance for future missions to Mars. 

Four people in black NASA jumpsuits are standing in front of a building with NASA logos and mission patches on the wall. They are smiling and holding mission patches, posing for a group photo.
PHOTO DATE: July 06, 2024 LOCATION: Bldg. 220 – CHAPEA Habitat SUBJECT: ASA Crew Health and Performance Exploration Analog (CHAPEA) Mars Analog Mission 1 Egress Event with crew Anca Selariu, Nathan Jones, Kelly Haston, Ross Brockwell. PHOTOGRAPHER: NASA/Josh Valcarcel
NASA/Josh Valcarcel

Kelly Haston: Mission Commander and Pioneering Scientist 

Haston, the mission commander, is a research scientist who builds human disease models. She has spearheaded innovative stem cell-based projects, deriving multiple cell types for work in infertility, liver disease, and neurodegeneration. Her role was pivotal in maintaining crew morale and ensuring the success of daily operations. 

She highlighted the importance of teamwork and adaptability in a mission with such high stakes.

“We had to rely on each other and our training to navigate the challenges we faced,” she said. “Every day brought new obstacles, but also new opportunities for growth and learning.” 

Nathan Jones: Medical Officer and Expert Communicator 

Jones, the crew medical officer, used his emergency and international medicine experience to tackle the unique challenges of the Mars mission. His expertise in problem-solving and effective communication in a time-sensitive and resource-limited environment was essential due to the approximately one-hour transmission delay. “Even something as simple as when to communicate is important,” said Jones. The crew had to consider what observations were essential to report to each other or Mission Control to avoid overburdening the team or unnecessarily using the limited bandwidth to Earth. 

“Everything we do in CHAPEA is touched by the heroes working on the ground at NASA,” he said. “We couldn’t ask for a better experience or better people to work with.” 

The experience evolved into a journey of personal growth for Jones. “I am constantly looking forward, planning for the future,” he said. “I learned to take time to enjoy the current season and be patient for the coming ones.” 

He also discovered a new hobby: art. “I have even surprised myself with how well some of my sketches have turned out,” he said. 

Anca Selariu: Microbiologist and Innovative Thinker 

Anca Selariu brought expertise as a microbiologist in the U.S. Navy, with a background in viral vaccine discovery, prion transmission, gene therapy development, and infectious disease research management. 

Selariu expressed that she owes much to the Navy, including her involvement in CHAPEA, as it helped shape her both personally and professionally. “I hope to bring back a fresh perspective, along with a strong inclination to think differently about a problem, and test which questions are worth asking before we set out answering them,” she said.  

Reflecting on the mission, Selariu said, “Every day seemed to be a new revelation about something; about Earth, about art, about humans, about cultures, about the history of life in the universe – what little we know of it.” 

She added, “As much as I appreciate having information at my fingertips, I will miss the luxury of being unplugged in a world that now validates humans by their digital presence.”  

Ross Brockwell: Structural Engineer and Problem Solver 

Brockwell, the mission’s flight engineer, focused on infrastructure, building design, and organizational leadership. His structural engineering background influenced his approach to problem solving in the CHAPEA habitat. 

“An engineering perspective leads you to build an understanding of how things will react and interact, anticipate possible failure points, and ensure redundancy and contingency planning,” he said. 

That mindset helped the crew develop creative solutions to mission challenges, such as using a 3D printer to design part adapters and tools and find ways to connect as a team. “Several things we wanted to do for fun required innovation, one being developing a bracket so we could safely and securely mount our mini-basketball hoop,” he said. 

He advises Artemis Generation members interested in contributing to future analog missions to think about systems engineering theory and learn to develop and integrate whole systems while solving individual challenges.  

Brockwell believes the most important attributes for a CHAPEA crew member are imagination and a strong sense of wonder. “Of course, one needs to have patience, self-control, emotional regulation, and a sense of humor,” he said. “I would also add perspective, which means understanding the importance of exploration missions on behalf of humankind and appreciating being part of something greater than oneself.” 

Four people wearing black NASA jumpsuits are standing in front of a white van with a CHAPEA mission logo. The individuals are wearing sunglasses and caps, and the background shows industrial equipment and power lines.
The CHAPEA crew is “back on Earth” after their 378-day mission inside the simulated Martian habitat.
NASA /Josh Valcarcel

A Vision for the Future 

As the first CHAPEA mission concludes, the data collected and experiences shared by the crew will pave the way for future explorations, bringing humanity one step closer to setting foot on Mars.  

“One of the biggest things I have learned on this long-duration mission is that we should never underestimate the effects of small gains over time,” said Jones. “Be willing to do the hard things now and it may make all the difference for the future.” 

Selariu emphasized the importance of interdisciplinary collaboration in upcoming space missions. “What everyone at CHAPEA seems to have in common is passion for space and drive to pursue it no matter the challenges, inconvenience, and personal sacrifices.” 

Brockwell looks forward to missions to the Red Planet becoming a reality. “It still fills me with awe and excitement to think that one day there will be people on the surface of other worlds, overcoming immense challenges and expanding the existence and awareness of life from Earth.” 

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Sumer Loggins

NASA’s Hubble Traces Dark Matter in Dwarf Galaxy Using Stellar Motions

NASA’s Hubble Traces Dark Matter in Dwarf Galaxy Using Stellar Motions

5 Min Read

NASA’s Hubble Traces Dark Matter in Dwarf Galaxy Using Stellar Motions

Distant and nearby galaxies dot an inky-black background. Bright foreground stars hold four diffraction spikes.
This NASA Hubble Space Telescope image reveals a section of the Draco dwarf galaxy.
Credits:
NASA, ESA, Eduardo Vitral, Roeland van der Marel, and Sangmo Tony Sohn (STScI); Image processing: Joseph DePasquale (STScI)

The qualities and behavior of dark matter, the invisible “glue” of the universe, continue to be shrouded in mystery. Though galaxies are mostly made of dark matter, understanding how it is distributed within a galaxy offers clues to what this substance is, and how it’s relevant to a galaxy’s evolution.

While computer simulations suggest dark matter should pile up in a galaxy’s center, called a density cusp, many previous telescopic observations have indicated that it is instead more evenly dispersed throughout a galaxy. The reason for this tension between model and observation continues to puzzle astronomers, reinforcing the mystery of dark matter.

A team of astronomers has turned toward NASA’s Hubble Space Telescope to try and clarify this debate by measuring the dynamic motions of stars within the Draco dwarf galaxy, a system located roughly 250,000 light-years from Earth. Using observations that spanned 18 years, they succeeded in building the most accurate three-dimensional understanding of stars’ movements within the diminutive galaxy. This required scouring nearly two decades of Hubble archival observations of the Draco galaxy.

A three-paneled image shows different perspectives of the Draco dwarf spheroidal galaxy. The first panel fill's the left half of the image. It is a Digitized Sky Survey image of the region. The upper-right and lower-right images are zoomed-in Hubble images of areas denoted by white boxes in the left-side image. Each of the images holds a field of distant galaxies and foreground stars on a inky-black background.
A team of astronomers analyzed observations by NASA’s Hubble Space Telescope taken over a span of 18 years to measure the dynamic motions of stars within the Draco dwarf galaxy. The telescope’s extensive baseline and data archive enabled the team to build the most accurate three-dimensional map of the stars’ movements within the system. These improved measurements are helping to shed “light” on the mysterious qualities and behavior of dark matter, the universe’s invisible “glue.” The left image is from the Digitized Sky Survey (DSS). It presents a wider view of the region. The two right-side images are Hubble views.
NASA, ESA, Eduardo Vitral, Roeland van der Marel, and Sangmo Tony Sohn (STScI), DSS; Image processing: Joseph DePasquale (STScI)

“Our models tend to agree more with a cusp-like structure, which aligns with cosmological models,” said Eduardo Vitral of the Space Telescope Science Institute (STScI) in Baltimore and lead author of the study. “While we cannot definitively say all galaxies contain a cusp-like dark matter distribution, it’s exciting to have such well measured data that surpasses anything we’ve had before.”

Charting the Movements of Stars

To learn about dark matter within a galaxy, scientists can look to its stars and their movements that are dominated by the pull of dark matter. A common approach to measure the speed of objects moving in space is by the Doppler Effect – an observed change of the wavelength of light if a star is approaching or receding from Earth. Although this line-of-sight velocity can provide valuable insight, only so much can be gleaned from this one-dimensional source of information.

Besides moving closer or further away from us, stars also move across the sky, measured as their proper motion. By combining line-of-sight velocity with proper motions, the team created an unprecedented analysis of the stars’ 3D movements.

“Improvements in data and improvements in modeling usually go hand in hand,” explained Roeland van der Marel of STScI, a co-author of the paper who initiated the study more than 10 years ago. “If you don’t have very sophisticated data or only one-dimensional data, then relatively straightforward models can often fit. The more dimensions and complexity of data you gather, the more complex your models need to be to truly capture all the subtleties of the data.”

A Scientific Marathon (Not a Sprint)

Since dwarf galaxies are known to have a higher proportion of dark matter content than other types of galaxies, the team honed in on the Draco dwarf galaxy, which is a relatively small and spheroidal nearby satellite of the Milky Way galaxy.

“When measuring proper motions, you note the position of a star at one epoch and then many years later measure the position of that same star. You measure the displacement to determine how much it moved,” explained Sangmo Tony Sohn of STScI, another co-author of the paper and the principal investigator of the latest observational program. “For this kind of observation, the longer you wait, the better you can measure the stars shifting.”

The team analyzed a series of epochs spanning from 2004 to 2022, an extensive baseline that only Hubble could offer, due to the combination of its sharp stable vision and record time in operation. The telescope’s rich data archive helped decrease the level of uncertainty in the measurement of the stars’ proper motions. The precision is equivalent to measuring an annual shift a little less than the width of a golf ball as seen on the Moon from Earth.

With three dimensions of data, the team reduced the amount of assumptions applied in previous studies and considered characteristics specific to the galaxy – such as its rotation, and distribution of its stars and dark matter – in their own modeling efforts.

An Exciting Future

The methodologies and models developed for the Draco dwarf galaxy can be applied to other galaxies in the future. The team is already analyzing Hubble observations of the Sculptor dwarf galaxy and the Ursa Minor dwarf galaxy.

Studying dark matter requires observing different galactic environments, and also entails collaboration across different space telescope missions. For example, NASA’s upcoming Nancy Grace Roman Space Telescope will help reveal new details of dark matter’s properties among different galaxies thanks to its ability to survey large swaths of the sky.

“This kind of study is a long-term investment and requires a lot of patience,” reflected Vitral. “We’re able to do this science because of all the planning that was done throughout the years to actually gather these data. The insights we’ve collected are the result of a larger group of researchers that has been working on these things for many years.”

These results are accepted for publication in The Astrophysical Journal.

The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, Colorado, also supports mission operations at Goddard. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.

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Media Contacts:

Claire Andreoli
NASA’s Goddard Space Flight CenterGreenbelt, MD
claire.andreoli@nasa.gov

Abigail Major and Ray Villard
Space Telescope Science Institute, Baltimore, MD

Science Contacts:
Eduardo Vitral, Roeland van der Marel, and Sangmo Tony Sohn
Space Telescope Science Institute, Baltimore, MD

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Attention Civil Servant Retirees

Attention Civil Servant Retirees

1 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

NASA’s Glenn Research Center civil servant retirees are invited to attend the 2024 Summerfest! 

Wednesday, Aug. 7, 11 a.m. to 2:30 p.m.  

Along Taylor Road at Lewis Field 

For more information or to RSVP, contact Kathy Clark at 216–433–8354 or kathy.m.clark@nasa.gov 

Registration closes: July 26 

Logo with splashes of color and the words, “Glenn Summerfest, Celebrating All of Us” on a purple banner.
Credit: NASA

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Kelly M. Matter

About the Office of the General Counsel

About the Office of the General Counsel

The Office of the General Counsel provides functional leadership regarding legal services and issues related to all aspects of NASA activities for Center Chief and Patent Counsel and, for Agency-wide issues, the Administrator. These services and issues include establishing and disseminating legal policy and interpreting new statutes and cases. The Office of the General Counsel is also responsible for developing the ethics and patent program requirements, establishing metrics, and developing quality standards.

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