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Dr. Margaret Meixner and Dr. Marc Postman Promoted to STScI Distinguished Astronomers
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By European Space Agency
Using the NASA/ESA/CSA James Webb Space Telescope, scientists observed the region above Jupiter’s iconic Great Red Spot to discover a variety of previously unseen features. The region, previously believed to be unremarkable in nature, hosts a variety of intricate structures and activity.
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By NASA
Although surrounded by the big and bold missions of human spaceflight, Margaret Kennedy, an aerospace systems engineer on the Human Health and Performance Contract, still appreciates the little things. Ask about her favorite NASA experience to date and she will tell you it is getting to show her badge to the gate guards at Houston’s Johnson Space Center every day. “Knowing I get to be a part of things that can change the world – that I’m helping to make it possible for astronauts to do their job safely, which in turn supports life on Earth – is very rewarding,” she said.
Margaret Kennedy poses with Johnson Space Center’s inflatable mascot, Cosmo, at Comicpalooza 2024 in Houston, Texas. Image courtesy of Margaret Kennedy Kennedy joined the Johnson team as a contractor with Aegis Aerospace in October 2019. Since then, she has spent most of her time as a systems engineer for the Human Research Program’s Program Integration and Strategic Planning group. That role required her to collect technical information for various projects and to ensure systems were in place to correctly track and manage program documents and agreements. This spring, Kennedy transitioned to a new role in which she provides systems engineering for flight hardware supporting Gateway and exploration missions to the Moon and Mars.
She started engaging with Johnson’s Employee Resource Groups (ERGs) shortly before the COVID-19 pandemic and jumped at the chance to get more involved once employees came back onsite. “A few people have been surprised when I tell them I’m really an introvert, not an extrovert, but I had to get out of my shell or I’d still be stuck in my apartment,” she said. “The ERGs were a way for me get out of my space and have allowed me to grow.”
Kennedy is thankful the Johnson Parenting ERG started allowing contractors to serve as secretaries because that led to similar opportunities with other ERGs. She served as the membership secretary for both Emerge and Out & Allied ERG (OAERG) in 2023 and is currently OAERG’s executive secretary. “I help keep our chair and co-chair up to date,” she said. “I have my finger on everything that’s happening in the ERG.” Filling these roles gives Kennedy numerous opportunities to support diversity, equity, and inclusion at Johnson, the most recent of which was her participation on a panel during the center’s Diversity, Equity, Inclusion, and Accessibility Day.
Margaret Kennedy (left) participates in a panel discussion during Johnson Space Center’s 2024 Diversity, Equity, Inclusion, and Accessibility Day with Kent Kalogera, Out & Allied ERG chair, Livette Santiago Cardona, Greening and Restoring Our World ERG chair, Andrea Browne, African American ERG chair, and Anika Isaac, Employee Assistance Program counselor.NASA/Robert Markowitz “The main advice I’d give to others wanting to get involved is find your people and don’t be afraid to take a risk,” she said. “Many of us deal with risk every day in our work so find a way to buy down risk by finding allies and a support system. Even if you only get a hair’s width outside your zone of comfort, it makes a difference.”
She also said that simply participating in ERG meetings and events – whether in person or virtually – is another great way to get involved. “The ERGs can’t do what we do without you,” she said. “We do it because it’s important to us and to others, but we sometimes struggle to know what people want. We need your thoughts and your ideas because it helps us provide programming and inform the center about what is happening.”
Being a part of OAERG in particular has helped Kennedy personally and professionally. “It has provided me with a space to be my authentic self and bring that person to both the world and work,” she said. “In the long line of LGBTQI+ letter soup, I end up in the + on the end more times than not. Out & Allied has given me a way to not only embrace my identity but also help spread awareness about it.” Professionally, the ERG has helped her network with a range of people, including upper and middle management, and strengthen her communication, problem solving, and leadership skills.
Margaret Kennedy (center) volunteering at a Hatch Youth event in Houston, Texas, with Kent Kalogera, Out & Allied ERG chair, and Chasity Williams, the group’s former chair. Image courtesy of Margaret Kennedy Kennedy acknowledged that change can take time, noting that while Johnson’s safety-oriented culture is a strength, it can sometimes slow the pace of initiatives that may not be considered mission critical, as can staffing shortages in some areas. “Things like accessible walkways and gender-neutral bathrooms are still important,” she said, adding that leadership is working on it.
Kennedy encourages everyone at Johnson to check in with their teammates and have “water cooler moments” with their colleagues as a way of promoting inclusivity. “Be patient and willing to give everyone some grace,” she said. “We can get so focused on the mission and what we need that we sometimes forget there are things happening in other people’s lives that can affect their work.”
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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
A red giant star and white dwarf orbit each other in this animation of a nova similar to T Coronae Borealis. The red giant is a large sphere in shades of red, orange, and white, with the side facing the white dwarf the lightest shades. The white dwarf is hidden in a bright glow of white and yellows, which represent an accretion disk around the star. A stream of material, shown as a diffuse cloud of red, flows from the red giant to the white dwarf. When the red giant moves behind the white dwarf, a nova explosion on the white dwarf ignites, creating a ball of ejected nova material shown in pale orange. After the fog of material clears, a small white spot remains, indicating that the white dwarf has survived the explosion.NASA/Goddard Space Flight Center Around the world this summer, professional and amateur astronomers alike will be fixed on one small constellation deep in the night sky. But it’s not the seven stars of Corona Borealis, the “Northern Crown,” that have sparked such fascination.
It’s a dark spot among them where an impending nova event – so bright it will be visible on Earth with the naked eye – is poised to occur.
“It’s a once-in-a-lifetime event that will create a lot of new astronomers out there, giving young people a cosmic event they can observe for themselves, ask their own questions, and collect their own data,” said Dr. Rebekah Hounsell, an assistant research scientist specializing in nova events at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “It’ll fuel the next generation of scientists.”
T Coronae Borealis, dubbed the “Blaze Star” and known to astronomers simply as “T CrB,” is a binary system nestled in the Northern Crown some 3,000 light-years from Earth. The system is comprised of a white dwarf – an Earth-sized remnant of a dead star with a mass comparable to that of our Sun – and an ancient red giant slowly being stripped of hydrogen by the relentless gravitational pull of its hungry neighbor.
The hydrogen from the red giant accretes on the surface of the white dwarf, causing a buildup of pressure and heat. Eventually, it triggers a thermonuclear explosion big enough to blast away that accreted material. For T CrB, that event appears to reoccur, on average, every 80 years.
Don’t confuse a nova with a supernova, a final, titanic explosion that destroys some dying stars, Hounsell said. In a nova event, the dwarf star remains intact, sending the accumulated material hurtling into space in a blinding flash. The cycle typically repeats itself over time, a process which can carry on for tens or hundreds of thousands of years.
“There are a few recurrent novae with very short cycles, but typically, we don’t often see a repeated outburst in a human lifetime, and rarely one so relatively close to our own system,” Hounsell said. “It’s incredibly exciting to have this front-row seat.”
Finding T Coronae Borealis
A conceptual image of how to find Hercules and the “Northern Crown” in the night sky, created using planetarium software. Look up after sunset during summer months to find Hercules, then scan between Vega and Arcturus, where the distinct pattern of Corona Borealis may be identified. NASA The first recorded sighting of the T CrB nova was more than 800 years ago, in autumn 1217, when a man named Burchard, abbot of Ursberg, Germany, noted his observance of “a faint star that for a time shone with great light.”
The T CrB nova was last seen from Earth in 1946. Its behavior over the past decade appears strikingly similar to observed behavior in a similar timeframe leading up to the 1946 eruption. If the pattern continues, some researchers say, the nova event could occur by September 2024.
What should stargazers look for? The Northern Crown is a horseshoe-shaped curve of stars west of the Hercules constellation, ideally spotted on clear nights. It can be identified by locating the two brightest stars in the Northern Hemisphere – Arcturus and Vega – and tracking a straight line from one to the other, which will lead skywatchers to Hercules and the Corona Borealis.
The outburst will be brief. Once it erupts, it will be visible to the naked eye for a little less than a week – but Hounsell is confident it will be quite a sight to see.
A coordinated scientific approach
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Watch V407 Cyg go nova! In this animation, gamma rays (magenta) arise when accelerated particles in the explosion's shock wave crash into the red giant's stellar wind.NASA/Conceptual Image Lab/Goddard Space Flight Center Dr. Elizabeth Hays, chief of the Astroparticle Physics Laboratory at NASA Goddard, agreed. She said part of the fun in preparing to observe the event is seeing the enthusiasm among amateur stargazers, whose passion for extreme space phenomena has helped sustain a long and mutually rewarding partnership with NASA.
“Citizen scientists and space enthusiasts are always looking for those strong, bright signals that identify nova events and other phenomena,” Hays said. “Using social media and email, they’ll send out instant alerts, and the flag goes up. We’re counting on that global community interaction again with T CrB.”
Hays is the project scientist for NASA’s Fermi Gamma-ray Space Telescope, which has made gamma-ray observations from low Earth orbit since 2008. Fermi is poised to observe T CrB when the nova eruption is detected, along with other space-based missions including NASA’s James Webb Space Telescope, Neil Gehrels Swift Observatory, IXPE (Imaging X-ray Polarimetry Explorer), NuSTAR (Nuclear Spectroscopic Telescope Array), NICER (Neutron star Interior Composition Explorer), and the European Space Agency’s INTEGRAL (Extreme Universe Surveyor). Numerous ground-based radio telescopes and optical imagers, including the National Radio Astronomy Observatory’s Very Large Array in Mexico, also will take part. Collectively, the various telescopes and instruments will capture data across the visible and non-visible light spectrum.
“We’ll observe the nova event at its peak and through its decline, as the visible energy of the outburst fades,” Hounsell said. “But it’s equally critical to obtain data during the early rise to eruption – so the data collected by those avid citizen scientists on the lookout now for the nova will contribute dramatically to our findings.”
For astrophysics researchers, that promises a rare opportunity to shed new light on the structure and dynamics of recurring stellar explosions like this one.
“Typically, nova events are so faint and far away that it’s hard to clearly identify where the erupting energy is concentrated,” Hays said. “This one will be really close, with a lot of eyes on it, studying the various wavelengths and hopefully giving us data to start unlocking the structure and specific processes involved. We can’t wait to get the full picture of what’s going on.”
Some of those eyes will be very new. Gamma-ray imagers didn’t exist the last time T CrB erupted in 1946, and IXPE’s polarization capability – which identifies the organization and alignment of electromagnetic waves to determine the structure and internal processes of high-energy phenomena – is also a brand-new tool in X-ray astronomy. Combining their data could offer unprecedented insight into the lifecycles of binary systems and the waning but powerful stellar processes that fuel them.
Is there a chance September will come and go without the anticipated nova outburst from T CrB? Experts agree there are no guarantees – but hope abides.
“Recurrent novae are unpredictable and contrarian,” said Dr. Koji Mukai, a fellow astrophysics researcher at NASA Goddard. “When you think there can’t possibly be a reason they follow a certain set pattern, they do – and as soon as you start to rely on them repeating the same pattern, they deviate from it completely. We’ll see how T CrB behaves.”
Learn more about NASA astrophysics at:
https://science.nasa.gov/astrophysics
Jonathan Deal
Marshall Space Flight Center, Huntsville, Ala.
256-544-0034
jonathan.e.deal@nasa.gov
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Last Updated Jun 06, 2024 Related Terms
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By NASA
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UNITE All-Nighter Delights Amateur Astronomers
Fadi Saibi and his daughter Sophie, age 14, pose for a photograph with their Unistellar telescope in their backyard in Sunnyvale, Calif., on Thursday, Jan. 11, 2024. Credit: Bay Area News Group/Nhat V. Meye Maybe you read about them in the papers–amateur astronomers in Japan, Russia, France, Finland, and the United States have been pulling all-nighters to spot extraordinary exoplanets, planets orbiting stars other than the Sun.
NASA’s UNITE project holds these planetary stakeouts several times every month, and you can join in!
This October, the UNITE team undertook a 20-hour marathon as part of tracking a Saturn-sized planet called TOI-4600 c. They watched and waited, trying to see the planet’s star dim by about 1% as the planet passed in front of it.
Success would tell us that the planet takes a little more than one Earth year to orbit its star. It would place this planet on a short list of gas-giant planets known outside our own solar system that have sizes and temperatures similar to those of Saturn and Jupiter. Such planets are key laboratories for studying how our solar system was formed, so each new example is precious.
In mid-January, the UNITE team coordinated observations across Europe to catch the third-ever star-crossing event for a different planet. (The third one seen by humans, that is!) Once the team does catch it, they’ll know if it takes three Earth years to orbits its star, which would make it fairly cold planet, or something closer to 100 Earth days, telling us that the planet is relatively warm.
The final results of these observations remain closely-guarded secrets, but they will soon be released in an astronomy journal articles.
The Unistellar Network Investigating TESS Exoplanets (UNITE) project is a global team of volunteer telescope observers tracking down rare worlds in distant solar systems. Visit science.unistellaroptics.com and you can be part of the next UNITE discovery!
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Last Updated Feb 02, 2024 Related Terms
Astrophysics Citizen Science Uncategorized View the full article
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By NASA
These images represent a sample of galaxy clusters that are part of the largest and most complete study to learn what triggers stars to form in the universe’s biggest galaxies. Clusters of galaxies are the largest objects in the universe held together by gravity and contain huge amounts of hot gas seen in X-rays. This research, made using Chandra and other telescopes, showed that the conditions for stellar conception in these exceptionally massive galaxies have not changed over the last ten billion years. In these images, X-rays from Chandra are shown along with optical data from Hubble.X-ray: NASA/CXC/MIT/M. Calzadilla el al.; Optical: NASA/ESA/STScI; Image Processing: NASA/CXC/SAO/N. Wolk & J. Major These four images represent a sample of galaxy clusters that are part of the largest and most complete study to learn what triggers stars to form in the universe’s biggest galaxies, as described in our latest press release. This research, made using NASA’s Chandra X-ray Observatory and other telescopes, showed that the conditions for stellar conception in these exceptionally massive galaxies have not changed over the last ten billion years.
Galaxy clusters are the largest objects in the universe held together by gravity and contain huge amounts of hot gas seen in X-rays. This hot gas weighs several times the total mass of all the stars in all the hundreds of galaxies typically found in galaxy clusters. In the four galaxy cluster images in this graphic, X-rays from hot gas detected by Chandra are in purple and optical data from NASA’s Hubble Space Telescope, mostly showing galaxies in the clusters, are yellow and cyan.
In this study, researchers looked at the brightest and most massive class of galaxies in the universe, called brightest cluster galaxies (BCGs), in the centers of 95 clusters of galaxies. The galaxy clusters chosen are themselves an extreme sample — the most massive clusters in a large survey using the South Pole Telescope (SPT), with funding support from the National Science Foundation and Department of Energy — and are located between 3.4 and 9.9 billion light-years from Earth.
The four galaxy clusters shown here at located at distances of 3.9 billion (SPT-CLJ0106-5943), 5.6 billion (SPT-CLJ0307-6225), 6.4 billion (SPT-CLJ0310-4647) and 7.7 billion (SPT-CLJ0615-5746) light-years from Earth, and the images are 1.7 million, 2 million, 2.4 million and 2.2 million light-years across, respectively. By comparison our galaxy is only about 100,000 light-years across.
In SPT-CLJ0307-6225 the BCG is near the bottom right of the image and in the other images they are near the centers. Some of the long, narrow features are caused by gravitational lensing, where mass in the clusters is warping the light from galaxies behind the clusters. The images have been rotated from standard astronomer’s configuration of North up by 20 degrees clockwise (SPT-CLJ0106-5943), 6.2 degrees counterclockwise (SPT-CLJ0307-6225), 29,2 degrees counterclockwise (SPT-CLJ0310-4647) and 24.2 degrees clockwise (SPT-CLJ0615-5746).
The team found that the precise trigger for stars to form in the galaxies that they studied is when the amount of disordered motion in the hot gas — a physical concept called “entropy” — falls below a critical threshold. Below this threshold, the hot gas inevitably cools to form new stars.
In addition to the X-ray data from Chandra X-ray Observatory and radio data from the SPT already mentioned, this result also used radio data from the Australia Telescope Compact Array, and the Australian SKA Pathfinder Telescope, infrared data from NASA’s WISE satellite, and several optical telescopes. The optical telescopes used in this study were the Magellan 6.5-m Telescopes, the Gemini South Telescope, the Blanco 4-m Telescope (DECam, MOSAIC-II) and the Swope 1m Telescope. A total of almost 50 days of Chandra observing time was used for this result.
Michael Caldazilla of the Massachusetts Institute of Technology (MIT) presented these results at the 243rd meeting of the American Astronomical Society in New Orleans, LA. In addition, there is a paper submitted to The Astrophysical Journal led by Caldazilla on this result (preprint here). The other authors on the paper are Michael McDonald (MIT), Bradford Benson (University of Chicago), Lindsay Bleem (Argonne National Laboratory), Judith Croston (The Open University, UK), Megan Donahue (Michigan State University), Alastair Edge (University of Durham, UK), Gordon Garmire (Penn State University), Julie Hvalacek-Larrondo (University of Colorado), Minh Huynh (CSIRO, Australia), Gourav Khullar (University of Pittsburgh), Ralph Kraft (Center for Astrophysics | Harvard & Smithsonian), Brian McNamara (University of Waterloo, Canada), Allison Noble (Arizona State University), Charles Romero (CfA), Florian Ruppin (University of Lyon, France), Taweewat Somboonpanyakul (Stanford University), and Mark Voit (Michigan State).
NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.
Read more from NASA’s Chandra X-ray Observatory.
For more Chandra images, multimedia and related materials, visit:
https://www.nasa.gov/mission/chandra-x-ray-observatory/
Visual Description
This release includes composite images of four galaxy clusters, presented in a two-by-two grid. Each image features a hazy, purple cloud representing X-rays from hot gas observed by Chandra. The distant galaxies in and around the clouds of hot gas have been captured in optical data, and are shown in golden yellows with hints of vibrant cyan blue.
The galaxy cluster at our upper left is labeled SPT-CLJ0310-4647. Here, the blackness of space is packed with gleaming specks of white, golden yellow, and bright blue light. These are individual galaxies. Some of the galaxies resemble blurred, glowing dots. In other galaxies, the curving arms of a spiral formation are discernible. At the center of the image, a faint purple cloud surrounds several of the cluster’s brightest galaxies.
At our upper right is an image of SPT-CLJ0615-5746. This is the most distant cluster of the four so the galaxies it contains appear relatively small. These galaxies are mostly located near the center of the image. The purple cloud of hot gas is roughly spherical, and has a light purple spot at its core.
At our lower right is SPT-CLJ0307-6225. Here, X-rays from hot gas are represented by a large, misty, purple cloud that covers much of the image. The brightest spot in the cloud is a light purple dot near our lower right. The most notable galaxy in this image is a pixilated spiral galaxy above and to our left of center.
The galaxy cluster at our lower left is labeled SPT-CLJ0106-5943. This cluster features a scattering of cyan blue galaxies, several of which appear stretched or elongated due to gravitational lensing. At the center of the image is a purple gas cloud with a bright white speck at its core.
News Media Contact
Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
Jonathan Deal
Marshall Space Flight Center
Huntsville, Ala.
256-544-0034
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