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How a Johnson Mentor Shapes the Next Generation of NASA Talent 

2026-10-27 07:07

3 Min Read

How a Johnson Mentor Shapes the Next Generation of NASA Talent 

Daniel Cohen, Guidance, Navigation & Control (GN&C) engineer at NASA’s Johnson Space Center, leads an outdoor orbital mechanics lesson for interns on Oct. 9, 2026. From left are Cohen, Lucas Anton Alonso-Munoyerro, Nathan Samuell, Marcos Pena, and Malvika Bhardwaj.
Credits: NASA

When Rice University student Malvika Bhardwaj asked her mentor Daniel Cohen, a Guidance, Navigation & Control (GN&C) engineer at NASA’s Johnson Space Center, whether he had time to keep teaching interns with his busy workload, he answered, “You decide what’s important.” 

In honor of National Mentoring Day on Oct. 27, Bhardwaj reflects on how Cohen’s advice and support has shaped her internship experience at Johnson. 

Through NASA’s Office of STEM Engagement, interns like Bhardwaj contribute to agency projects while learning from NASA mentors and gaining technical skills and hand-on experience to build a future career in space exploration. 

Bhardwaj studies computational and applied mathematics at Rice University and interns with the GN&C team, which focuses on how spacecraft determine their position and maneuver in orbit. She is developing tools to analyze thruster firings on the U.S. Deorbit Vehicle that will help NASA safely deorbit the International Space Station at the end of its operational life. Bhardwaj also uses computer simulations to test the vehicle’s control system and identify conditions under which it could fail. 

“I’ve learned about the culture of community and support at Johnson and NASA as a whole. Daniel made an effort to introduce me to the team and include me in conversations and meetings. I saw how team members step up to help one another and keep the whole unit moving forward,” Bhardwaj said. 

Cohen, a Rice University alumnus with a master’s in mechanical engineering, began his NASA career as a flight operations intern in 2020. He later held internships in docking dynamics, propulsion systems, and GN&C analysis before joining Johnson as a full-time engineer in August 2024. 

His current work includes developing simulations and models for studies of the U.S. Deorbit Vehicle, analyzing its control algorithms and GN&C performance, and evaluating SpaceX’s design at multiple life-cycle reviews.

He also analyzes settings for the Orion spacecraft’s docking camera, which provides positioning measurements that can help inform navigation during future Artemis rendezvous activities. 

Cohen supports Bhardwaj beyond her internship, giving her a closer look at how colleagues collaborate on projects and share ideas. He sets aside a couple of hours each week to teach interns topics such as orbital mechanics and control systems. 

Bhardwaj took Cohen’s advice to heart: How she spends her time and energy reflects what she values. She believes that her internship has shown her that problem-solving is rarely an individual effort. Team members bring different perspectives and need to understand how their work connects to a larger project. 

Working alongside interns in outreach, social media, and digital design has also broadened Bhardwaj’s view of STEM careers. “No matter what interests you, there’s likely a role for you here,” she said.  

She was proud to complete her first project, a set of analysis tools she built from scratch. Working through the debugging process and seeing a finished, functioning product was especially rewarding. 

Bhardwaj’s advice to students interested in NASA internships is to apply even if they do not feel fully prepared. 

“You’re probably never going to feel 100% ready, but so much of the learning happens on the job,” she said. “Trust in your ability to navigate new environments.” 

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Sumer Loggins

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Oct 27, 2026

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APOD: 2026 October 27 – Noctilucent Clouds over Sweden

2026-10-27 04:05

APOD

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

A dark night sky is pictured over a green field bounded by trees in silhouette. Across the image middle are blue filamentary glows -- noctilucent clouds. Dark clouds are seen across the top of the image.  Please see the explanation for more detailed information.

Noctilucent Clouds over Sweden

Explanation: Sometimes it’s night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises upfrom the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Normally too dim to be seen, they may become visible just after sunset during the summer when illuminated by sunlight from below the horizon. Noctilucent clouds are the highest clouds and are known more technically as polar mesospheric clouds. Featured here as they appeared in early August, a network of blue noctilucent clouds was captured in the distant sky above a field of green grass near Linköping, Sweden, with trees in stark silhouette across the horizon. Much about noctilucent clouds has been discovered only in the past two decades, while how they form and evolve remains a topic of active research.

Tomorrow’s picture: round and round

Date October 27, 2026
Credit & Copyright V. Höfer, D. Večerník & B. Večerníková
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.

A-81 Reaches South Georgia

2026-10-27 04:00

A large, blocky iceberg sits in dark ocean water just southwest of a long, narrow, snow-capped island. Thin clouds partly veil the scene.
Iceberg A-81 slows its drift near the edge of South Georgia’s shallow underwater shelf in this image, acquired on October 20, 2026, by the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite.
NASA Earth Observatory/Michala Garrison

Some Antarctic icebergs linger close to home for decades, running aground near the ice shelves that spawned them or circling partway around the continent on coastal currents. Others, like Iceberg A-81, make a faster exit, heading north out of the Weddell Sea along a route well-traveled by the region’s bergs.

Fast is relative, though. After breaking from the Brunt Ice Shelf in January 2023, the roughly 1,550-square-kilometer (600-square-mile) berg spent more than three years in the Weddell Sea, carried along the coast by the clockwise-flowing Weddell Gyre. By May 2026, it reached the tip of the Antarctic Peninsula. It then moved north into the Scotia Sea, and by late October 2026, it approached the remote island of South Georgia in the South Atlantic Ocean, 2,300 kilometers (1,400 miles) north-northwest of the Brunt Ice Shelf.

This image, acquired by the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite, shows the berg on October 20. In the days before, its progress slowed noticeably, and it appeared to be bumping along the edge of the island’s underwater shelf, according to Jan Lieser of Australia’s Bureau of Meteorology and Christopher Shuman of the University of Maryland (retired). South Georgia has slowed and even stopped icebergs before. In 2025, for instance, Iceberg A-23A ran aground on the shelf and later broke apart.

Though Iceberg A-81 was a steadfast traveler once it broke free, it took its time in becoming an iceberg in the first place. For about 35 years, one of the Brunt Ice Shelf’s rifts known as Chasm 1 was relatively stable. Then, around 2012, it began growing again, and by 2019, it was advancing quickly enough that a break seemed imminent. But the floating glacial ice held on for several more years until finally, in January 2023, the berg let go.

Calving is a normal part of the life cycle of ice shelves, but scientists keep a close eye on Brunt, which has recently shed several large icebergs in quick succession and is home to the British Antarctic Survey’s Halley Research Station, a major base for Earth, atmospheric, and space science research since the 1950s. Besides A-81, the ice shelf calved Iceberg A-74 from the North Rift in 2021 and Iceberg A-83 from the Halloween Crack in 2024. A-74 has since broken up, while A-83 remains intact and is trailing A-81 northward, along with a handful of other icebergs that appear to be clearing out of the Weddell Sea.

NASA Earth Observatory image by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview. Story by Kathryn Hansen.

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NASA’s Perseverance Views Dust at Neretva Vallis

2026-10-26 22:48

1 Min Read

NASA’s Perseverance Views Dust at Neretva Vallis

A panoramic view of a barren, rocky landscape with distant hills, framed by parts of a robotic rover visible on the left and right edges.

PIA26816

Credits:
NASA/JPL-Caltech/ASU/MSSS

Description

This 360-degree look at Neretva Vallis within Mars’ Jezero Crater was stitched together using 217 images acquired by the rover’s Mastcam-Z on May 20, 2024, the 1,155th Martian day, or sol, of the mission. While it is a wind-swept dusty vista today, billions of years ago it was home to a river channel that fed fresh water into Jezero Crater.

This is an enhanced-color version, which had its color bands processed to improve visual contrast and accentuate color differences,

Arizona State University leads the operations of the Mastcam-Z instrument, working in collaboration with Malin Space Science Systems in San Diego, on the design, fabrication, testing, and operation of the cameras, and in collaboration with the Niels Bohr Institute of the University of Copenhagen on the design, fabrication, and testing of the calibration targets.NASA’s Jet Propulsion Laboratory, which is managed for the agency by Caltech, built and manages operations of the Perseverance rover.

NASA’s Perseverance Offers Clues to Protect Crews From Mars Dust

2026-10-26 21:07

6 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

A panoramic view of a barren, rocky landscape with distant hills, framed by parts of a robotic rover visible on the left and right edges.
This 360-degree panorama from NASA’s Perseverance Mars rover shows Neretva Vallis, the dusty, long-dried river channel that cuts through the western rim of Mars’ Jezero Crater.
NASA/JPL-Caltech/ASU/MSSS

Over 1,645 Martian days, NASA’s Perseverance Mars rover measured the fine and ultrafine Martian dust particles found clinging to samples of spacesuit materials that are carried aboard the rover, including some that are small enough to penetrate the lungs and enter the bloodstream. The findings will be published Tuesday, Oct. 27, in the Proceedings of the National Academy of Sciences and could inform spacesuit and habitat design, dust-removal procedures, and crew health standards for future NASA missions to Mars.

“NASA has a long history of turning challenges into workable solutions and of finding creative ways to use the data that we have to answer questions beyond what it was originally collected for,” said Lindsay Hays, acting director, Planetary Science Division, NASA Headquarters in Washington. “Dust has been a surface-exploration challenge since the Apollo program. Perseverance is giving our engineers and flight surgeons measurements they can use to improve our existing designs well before the first American astronauts arrive on Mars.”

Lunar dust scratched visors, degraded outer spacesuit layers, and damaged their seals during NASA’s Apollo missions, and some crew members reported symptoms similar to hay fever.

Rounded by wind-driven collisions with other particles, dust grains on Mars are less abrasive than those on the Moon. They also are enriched in sulfur, chlorine, and iron and contain more silica than lunar dust. Regional and global dust storms on Mars can keep the grains recirculating throughout the atmosphere as well.  

The rover carries a set of five samples of spacesuit material. The swatches, each three-quarters of an inch (20 millimeters) square, are part of a calibration target used to test the settings of SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals), an instrument on Perseverance’s robotic arm. The calibration target for another instrument that provided the dust measurements, called PIXL (Planetary Instrument for X-ray Lithochemistry), carries a sample of Teflon and of basaltic glass.

Because Teflon contains no elements that PIXL can directly detect, whatever elemental signals the X-ray spectrometer picks up from that sample comes from dust resting on it.

The team also analyzed swatches of Teflon and Vectran, two materials used in spacesuits, on SHERLOC’s calibration target. NASA sent the swatches to Mars to study how spacesuit materials hold up on the planet’s surface.

“Perseverance’s main job is to search for signs of ancient microbial life, but the mission was also designed to help prepare for human explorers. That effort includes technology demonstrations like MOXIE (Mars Oxygen In-Situ Resource Utilization Experiment) and Ingenuity, as well as the spacesuit samples,” said Katie Stack Morgan, Perseverance’s project scientist at NASA’s Jet Propulsion Laboratory in Southern California.

Fine, ultrafine

While earlier measurements on Mars resolved dust particles down to about 3 micrometers across, PIXL detected two categories of even smaller particles: fine particles measuring less than 2.5 micrometers (a human hair is about 70 micrometers wide) and ultrafine particles around 100 nanometers (about 700 times thinner than a human hair). Particles on PIXL’s Teflon target and SHERLOC’s Vectran swatch averaged about 2 micrometers. On PIXL’s basaltic glass and SHERLOC’s Teflon swatch, dust particle sizes ranged down to about 100 to 300 nanometers.

A split view shows a rover on a rocky landscape with a yellow circle highlighting a deck instrument, alongside a close-up of that instrument's calibration target featuring rows of circular and square material samples.
This annotated composite image shows the location on NASA’s Perseverance of the calibration target for rover’s SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals) instrument. At right is a close-up of the calibration target.
NASA/JPL-Caltech

Static electricity appears to determine which size dust particles stick to which surface. Dust grains become charged as they collide in the air, and different materials on the calibration target attract grains of different sizes. The finest particles stayed attached through years of driving and drilling. Organic polymers like SHERLOC’s Teflon spacesuit sample are common in the outer layers of spacesuits, and the results show they readily collect fine dust.

The study also found that some materials hold less dust than others, which could guide future choices of materials and protective coatings for spacesuits and habitats. Designs such as suitports, which let astronauts enter a suit attached to the outside of a habitat, and dual-chamber airlocks could reduce how much dust gets inside astronauts’ living quarters.

“The existence of Mars dust at these ultrafine sizes has been predicted for a long time, and PIXL gave us the chance to measure it directly on Mars,” said Scott VanBommel, a Perseverance scientist at Washington University in St. Louis and the paper’s lead author. “The larger clumps, the Martian dust bunnies, get shaken off over time. But the smallest particles stay behind, and those are the ones that pose the greatest challenge for human support systems.”

Chemically, the dust matches the iron- and sulfur-rich composition that earlier missions measured. The PIXL instrument also found the dust to be enriched in phosphorus and detected signs of calcium sulfate.

Protecting crews

On Earth, airborne particles, or particulate matter, below 2.5 micrometers (that is, fine particles) are tied to a range of negative health effects because they can penetrate deep into the lungs and enter the bloodstream. Studies have shown that ultrafine particles (those no larger than 100 nanometers) can travel from the nasal cavity to the brain along the olfactory nerve.

Martian dust is composed predominantly of silicate minerals and carries chemically reactive compounds, including perchlorates that can disrupt thyroid function and reactive iron that induces cellular damage. Scientists believe that the health risks of Mars dust depend on the quantity of dust and length of exposure.

The PIXL results are the first on-site measurements of fine and ultrafine particles on Mars, and this research can inform broader efforts to refine indoor dust-exposure limits for astronauts, develop safe habits, and establish ways to remove dust while exploring Mars.

NASA is already working on solutions to extraterrestrial dust hazards, using ground test facilities and lunar missions as proving grounds for future Mars explorers. In March 2025, the agency tested an Electrodynamic Dust Shield, which used electric fields to clear lunar regolith from glass and thermal radiator surfaces on the Moon. Developed at NASA’s Kennedy Space Center in Florida, it landed on the Moon aboard Firefly Aerospace’s Blue Ghost Mission 1. At NASA’s Johnson Space Center in Houston, engineers at the Lunar Development and Test Facility use vacuum chambers and lunar regolith simulant to test spacesuit components, mechanisms, and a Handheld Lunar Electrostatic Dust Mitigation tool ahead of Artemis missions to the lunar surface.

More about Perseverance

Managed for NASA by Caltech, JPL built and manages operations of the Perseverance rover on behalf of the agency’s Science Mission Directorate as part of NASA’s Mars Exploration Program portfolio. NASA JPL also built PIXL and SHERLOC.

To learn more about Perseverance visit:

https://science.nasa.gov/mission/mars-2020-perseverance

-end-

Media Contacts
DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
david.c.agle@jpl.nasa.gov

Karen Fox / Alana Johnson
NASA Headquarters, Washington
240-285-5155 / 202-672-4780
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov

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