Written by William Farrand, Senior Research Scientist, Space Science Institute

Earth planning date: Friday, Aug. 28, 2026

The span of sols spanned by this blog post is noteworthy in several ways. First, Curiosity became a world-class (for Mars at least) mountaineer by passing the 1 kilometer mark of elevation from its landing site on the floor of Gale crater. This writer was on the Mars Exploration Rover science team and we were excited when the Spirit rover got to the top of Husband Hill in Gusev crater in August 2005. But that was a climb of 106 meters (about 348 feet) above its landing site, and Curiosity has passed 1000 meters (about 0.62 miles). 

Second, Saturday, Aug. 29, marked 5,000 Martian days (or sols) since Curiosity landed on Mars (that’s more than 5,137 Earth days, because a day on Mars lasts 24.6 hours). Congratulations are in order to the engineers and scientists who have made this landmark possible. 

Finally, in terms of its science activities Curiosity is examining a wind-formed, long, narrow, large ripple which has been named “Chocolatal.” Further examination will help determine if this feature could be classified as a “transverse aeolian ridge” or TAR. TARs have been observed across the Martian surface based on orbital imaging. The long axis of a TAR is oriented perpendicular to the local predominant wind direction. While this is not the first potential TAR that has been examined by Curiosity, its location, higher on the slopes of Mount Sharp invites questions about whether it will be composed of the same types of granular materials found in the lower TARs, or whether it has a different range of grain sizes and/or layering. 

Other questions to be addressed include how the ridge formed, whether it is active, how it has migrated, and, if it is immobile, then how has it stabilized?

At the start of the planning week, Curiosity was en route to the sand ripple and encountered interesting science targets along the way. In Monday’s two-sol plan, in-situ examinations were planned of the light-toned bedrock occurring along the rover’s path. Some of the rocks encountered near the rover had dark-toned thick coatings or remnant layers, and these were targeted for chemical examination by the rover’s ChemCam Laser Induced Breakdown Spectroscopy (LIBS) instrument. Mastcam and ChemCam Remote Micro Imager (RMI) mosaics were planned, for layers in buttes along the rover’s path, and on more distant sets of sand ripples.

A midweek planning session took advantage of the last drive, leaving the rover only a few meters from Chocolatal. ChemCam was able to target sand at the base of Chocolatal as well as nearby bedrock. Stand-off Mastcam high-resolution image mosaics of the ripple were also targeted. The drive planned midweek took the rover right into Chocolatal with one of its wheels and then backing off a little, so in the end-of-week plan, contact science could be planned within the trenched region.

The final planning session of the week, which extended through the landmark Sol 5000, involved MAHLI mosaics of the right wall of the trench to see if there is layering, and to assess any variations in grain size. It’s noteworthy that these MAHLI mosaics are being named in honor of our late colleague Paul Geissler, who was one of the foremost experts on the study of Martian TARs and who was working with the MAHLI team before his untimely passing earlier in the year. In-situ APXS measurements were planned of the coarse-grained surface of the ripple, and ChemCam LIBS measurements were planned on the top of Chocolatal, a sinuous feature looking like a “mohawk” haircut (see the accompanying image). LIBS was also planned on a dark band on its flank and at the back of the scuff/trench. Other activities in the three-sol plan included Mastcam mosaics, an AM Navcam dust-devil survey, Navcam suprahorizon survey, and APXS atmospheric measurements.

With 5000 sols of outstanding scientific accomplishments, the Curiosity science and engineering team looks forward to the next 5000 sols.

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The crew of NASA’s Artemis II mission – NASA astronauts Christina Koch, Victor Glover, and Reid Wiseman and CSA (Canadian Space Agency) astronaut Jeremy Hansen – visited Huntsville, Alabama, Sept. 1, 2026, where they met with the NASA workforce at NASA’s Marshall Space Flight Center. The event gave the crew an opportunity to share firsthand experiences from their mission, reflect on their time in space, and connect with the workforce that supported the mission through an engaging question-and-answer session.

Image credit: NASA/Brandon Hancock

Source: www.nasa.gov

Last November, NASA and its European partners launched the Sentinel-6B satellite to improve hurricane forecasts, help protect infrastructure, and benefit commercial industries, including shipping. The satellite now is flying 30 seconds behind its predecessor, Sentinel-6 Michael Freilich. Both satellites are providing precise sea level height measurements during what oceanographers expect to be a historic El Niño, a naturally occurring oceanic phenomenon in which warmer-than-usual Pacific waters shift global weather patterns.

The two satellites make up the Copernicus Sentinel-6/Jason-CS (Continuity of Service) mission, the latest in a series of ocean-observing radar altimetry missions that have been monitoring Earth’s changing seas continuously since the early 1990s.

The data each satellite is collecting will not only allow scientists to better understand this year’s El Niño but will also help them create more accurate hurricane predictions.

“This El Niño was a late-bloomer,” said Josh Willis, Sentinel-6B’s project scientist at NASA’s Jet Propulsion Laboratory in Southern California. “It didn’t kick off until the middle of the year and is just now reaching a strength similar to what we’ve seen in the satellite record during significant El Niños in 1997 and 2015. We expect it to be big, and it’s already having big impacts.”

El Niños generally scramble weather patterns tied to rainfall and storms, including hurricanes. They also redistribute heat in the ocean, which affects sea level. Normally, Earth’s warmest ocean waters sit along the equator in the western Pacific. During El Niño, weakened winds, which usually blow westward along the equator, result in heat spreading east toward South America. The change in ocean heat shifts hurricane activity from the Atlantic to the Pacific Ocean.

Predicting hurricane strength

On July 15, Sentinel-6B began delivering low-latency data to scientists that could be used for weather predictions. That data will take some time to work its way into the research models on which meteorologists and climate scientists rely, but when it does, those improved models could save lives.

Data from Sentinel-6 satellite missions feeds into hurricane tracking algorithms used by federal and state agencies. Those predictions can activate disaster response efforts, mobilizing resources ranging from sandbag placement to National Guard activation. They also can lead to evacuation orders that require quick but well-informed decisions about logistics at a local level. More severe events may require engaging larger organizations, such as the Federal Emergency Management Agency.

A tropical storm can take a week or more to become a hurricane and make its way to a coastline, but a hurricane can rapidly intensify in the 48 hours prior to landfall, leaving planners little time to prepare.

“Hurricanes have been known to speed up quickly at the last moment, so the window in which to decide what to do is short,” said Deirdre Byrne, an oceanographer and altimetry expert with the National Oceanic and Atmospheric Administration (NOAA). “The goal is to forecast how much and how rapidly intensification will happen so that officials can make the right calls.”

Byrne oversees one of the country’s most crucial hurricane forecasting algorithms, NOAA’s Satellite Ocean Heat Content Suite, which has been operating since 2012.

Each Sentinel-6 satellite measures ocean height, as well as the size of waves and marine wind speed, using a radar altimeter, which bounces thousands of radar pulses a second off the crests and troughs of waves. Ocean height varies from place to place and provides insight into the ocean’s heat content, since warm water expands. That, in turn, helps forecast how fast hurricanes will grow.

The satellites each carry a second instrument, called the Global Navigation Satellite System – Radio Occultation (GNSS-RO), which measures atmospheric properties, such as humidity, pressure, and temperature.

Among the measurements Sentinel-6 is gathering, Byrne is most anticipating the ocean height data, which she plans to begin incorporating into the current Satellite Ocean Heat Content Suite algorithm by the end of the year.

“In terms of data quality, the Sentinel-6 missions are unparalleled,” Byrne said.

Together, the missions are also extending a precise dataset deep into its fourth decade. This record of sea level observations traces back to the TOPEX/Poseidon mission, which launched in 1992, and continues through to the present day with Sentinel-6 Michael Freilich. Sentinel-6B will take over for its predecessor as the reference satellite for global sea level measurements later this year.

“The key is consistency, measuring the same way, every time,” said Severine Fournier, Sentinel-6B deputy project scientist, JPL. “That’s what lets us predict hurricanes, and, in turn, protect coastal communities and infrastructure.”

More about Sentinel-6B

Sentinel-6 Michael Freilich, named after a former director of NASA’s Earth Science Division, is one of two satellites that compose the Copernicus Sentinel-6/Jason-CS mission.

Sentinel-6/Jason-CS, a part of the European Union’s Earth observation program called Copernicus, was jointly developed by ESA (European Space Agency), EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), NASA, and NOAA, with funding support from the European Commission and technical support on performance from the French space agency CNES (Centre National d’Études Spatiales). Spacecraft monitoring and control, as well as the processing of all the altimeter science data, is carried out by EUMETSAT on behalf of the European Union’s Copernicus Programme, with the support of all partner agencies.

NASA JPL, a division of Caltech in Pasadena, contributed three science instruments for each Sentinel-6 satellite: the Advanced Microwave Radiometer, the GNSS-RO, and the Laser Retroreflector Array. NASA also contributed launch services, ground systems supporting operation of the agency’s science instruments, the science data processors for two of these instruments, and support for the United States members of the international Ocean Surface Topography Science Team.

For more about Sentinel-6B, visit:

https://science.nasa.gov/mission/sentinel-6B

-end-

Media Contacts

Andrew Good / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433 / 626-379-6874
[email protected] / [email protected]

2026-060

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Four unassuming memorials offer daily reminders of 9/11 at and around Fort Knox, Ky.

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Air Force Capt. Hanna Born is on a personal mission to honor the victims of the Sept. 11, 2001, terrorist attacks by running 2,977 miles — one mile for each person killed that day.

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Eruptions are a regular occurrence at Anak Krakatau, a small volcano between the Indonesian islands of Java and Sumatra. Much of its activity remains relatively mild, but it occasionally puts on more impressive and hazardous shows of force. In early September 2026, a booming eruption lasting more than 24 hours sent gas and ash high into the atmosphere, disrupting thousands of flights and degrading air quality in parts of the country, including the capital city of Jakarta.

Satellites passing over the area during the eruption on September 5 captured images of the explosive activity. In the scene above, acquired with the OLI (Operational Land Imager) on the NASA-USGS Landsat 8 satellite, a white plume of volcanic gas billows over a brown ash cloud. Below, a wider view captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the Suomi NPP satellite shows the volcanic material dispersing over a large area.

Indonesia’s meteorological agency reported that ash had reached altitudes up to 6,000 meters (20,000 feet) to the east of the volcano and 15,000 meters (50,000 feet) to the west by September 6. The presence of ash in the atmosphere prompted the temporary closure of eight airports on Java and Sumatra, disrupting nearly 3,000 flights in and out of the area, according to news reports.

Ashfall affected populated areas, particularly to the east of Anak Krakatau in Jakarta and other parts of West Java, the Indonesian Humanitarian Coordination Platform (IHCP) reported. Volcanic ash poses health risks to people and can irritate the respiratory tract, eyes, and skin. However, this air quality hazard differs from the smoke produced by peatland fires elsewhere in the country in terms of particle characteristics, dispersal patterns, and protection measures, the IHCP noted. 

On September 6, the continuous explosive eruption from Anak Krakatau subsided, though the volcano kept rumbling. It returned to a more typical pattern of Strombolian eruptions, characterized by intermittent spurts of ash and volcanic material. Airports had resumed operation by September 8, but the volcano remained at the second-highest alert level on the country’s scale, as it has been since early July.

NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey, and VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Suomi National Polar-orbiting Partnership. Story by Lindsey Doermann.

Downloads

September 5, 2026: Landsat

JPEG (14.89 MB)

September 5, 2026: VIIRS

JPEG (3.38 MB)

References & Resources

• ABC News (2026, September 7) Flights to and from Indonesia’s capital resume after volcanic eruption forced a 2-day closure. Accessed September 8, 2026.
• BBC (2026, September 8) Indonesia airports reopen after volcano eruption leaves 340,000 stranded. Accessed September 8, 2026.
• BMKG (2026, September 7) Imbas Sebaran Abu Vulknaik Anak Krakatau, 8 Bandara Ditutup Sementara, BMKG Minta Waspada dan Tenang. Accessed September 8, 2026.
• BMKG (2026, September 6) BMKG Terus Pantau Dampak Erupsi Gunung Anak Krakatau. Accessed September 8, 2026.
• Global Volcanism Program (2026) Krakatau. Accessed September 8, 2026.
• Indonesia Humanitarian Coordination Platform (2026, September 6) Anak Krakatau Eruption, Volcanic Ashfall and Concurrent Forest Fire & Haze Situation. Accessed September 8, 2026.
• NASA Earth Observatory, Anak Krakatau. Accessed September 8, 2026.

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Using NASA’s Chandra X-ray Observatory, scientists have discovered a new class of objects behaving unlike any they have seen before. Astronomers suggest these newly spotted objects in other galaxies may help solve not one, but two long-standing questions in astrophysics.

These mysterious objects give off unusually low-energy X-rays but intense levels of ultraviolet radiation. This discovery is featured in a paper published Wednesday in Nature Astronomy.

“We’ve never encountered a group of objects that act like this,” said Mustafa Muhibullah of the University of Alabama who led the study. “Of course, the next step was to try to figure out what these things are.”

The researchers found a total of 84 of these “hypersoft X-ray sources” – so named because they give such low-energy X-rays – in the six different galaxies they searched, using data openly available to the public in the Chandra archive. Two of the galaxies are spirals, M31 (the Andromeda galaxy) and M101 (the Pinwheel galaxy), while the other four are ellipticals. They found hypersoft X-ray sources both in regions of active star formation and areas where there are older stars.

The team spotted the sources by finding objects that appeared in Chandra images taken at the lowest X-ray energies but vanished in higher-energy images. That means these objects give off far more low-energy X-rays than high-energy ones. Because low-energy X-rays border energetic ultraviolet radiation on the electromagnetic spectrum, the researchers determined that these sources are producing large amounts of energetic ultraviolet radiation as well.

It is unclear what types of objects are responsible for these low-energy X-rays and intense ultraviolet radiation. The team thinks they most likely involve a black hole, neutron star, or white dwarf pulling material from a companion star. The material pulled from the companion star is heated up to produce X-rays before falling onto the white dwarf or neutron star, or into the black hole. Such binary systems have been seen before, but not with such bright ultraviolet radiation and low-energy X-rays.

The discovery suggests that there may be large populations of binary systems with energetic ultraviolet radiation that have been undetected until now.

“These clandestine X-ray sources are actually among the most energetic objects in galaxies, and they could be solving two cosmic mysteries at once,” said Muhibullah.

Scientists think that some white dwarf systems pulling material from companion stars may eventually explode as a supernova – known as a Type Ia – that is critical for measuring the expansion of the universe. These supernovae played a key role in discovering that this expansion is accelerating. Astronomers have been looking for the stars that turn into Type Ia supernovae for many years, so far without success.

“If we could find a way to spot these Type Ia supernova explosions before they go off, that would be really important,” said co-author Jimmy Irwin, also of the University of Alabama. “Right now, we study them after they’ve exploded, and astronomers have struggled to understand what is actually ignited.”

The other mystery these hypersoft X-ray sources might explain is what strips electrons from gas between the stars in some galaxies. This stripping of electrons is important to probe because it can affect how quickly stars form and influence the life cycles of galaxies. Hot, massive stars play a role, but they do not completely explain what is causing this stripping. The intense levels of ultraviolet radiation from the hypersoft X-ray sources may play a vital role.

Why were these hypersoft X-ray sources not found until now? In addition to the low-energy X-ray output, which is very difficult for X-ray telescopes to detect, the high-energy ultraviolet radiation is readily absorbed by helium and hydrogen gas that fills the space between the stars, creating a nearly impenetrable barrier to look through.

“By combing through the Chandra archive, we were able to eliminate what used to be a blind spot for telescopes,” said co-author Rosanne Di Stefano of the Center for Astrophysics | Harvard & Smithsonian. “That’s how we found what appears to be a new class of cosmic objects with remarkable qualities.”

NASA’s Marshall Space Flight Center in Huntsville, Alabama, 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

To learn more about NASA’s Chandra mission, visit:

https://www.nasa.gov/chandra

Visual Description

This release features a composite image of a spiral galaxy, M101; one of six identified galaxies housing a new class of mysterious objects that give off unusually low-energy X-rays.

In this composite image, M101 faces us directly. It has multiple arms in shades of purple, spiraling clockwise around a golden yellow core. Scattered along and between the arms are scores of tiny specks in white and purple. Most of those specks are pairs of stars, but seven of them are a mystery.

To casual observers, the unusual objects are visually indistinguishable from the other specks of light in the galaxy. An annotated version of the composite image is included in this release, with red circles around the mysterious specks for easy identification.

These mystery specks behave like no other class of object discovered before. The curious objects give off X-rays of such low energy, they in fact produce large amounts of ultraviolet radiation, as UV radiation borders X-rays on the electromagnetic spectrum. Searching images of galaxies with low-energy X-rays in the Chandra Observatory archive, scientists have found a total of 84 such objects spread across M101 and five other galaxies. They have dubbed these mysterious objects “hypersoft X-ray sources.”

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Jaden Caradine knew he wanted to be an engineer at eight years old. He just took a winding road to get there.

Before he enrolled at Embry-Riddle Aeronautical University, before he discovered the field that would become his focus, and before he landed a Pathways internship at NASA’s Langley Research Center in Hampton, Virginia, Caradine spent five years as a mechanic in the United States Marine Corps, four of them stationed in Japan. It was a deliberate detour, one that shaped how he approaches everything since.

“I’ve kind of always known I wanted to be an engineer,” he says. “I just had to figure out what kind.”

Finding the Overlap

Caradine grew up in the Salt Lake City area, raised by a mother who put him on a snowboard at four and on a rock face not long after. He was the kind of kid who learned to love science not for its own sake, but for what it could do. “Math is an enabling skill,” he says. “It’s not about doing the math. Math has a purpose and it’s useful.”

By the time someone asked young Jaden what he wanted to be, the answer was immediate. “I was building Legos,” he says, “and I just thought — I want to build stuff. I can’t really see myself being anything other than an engineer.”

Right out of high school, Caradine enlisted in the Marines, trained as a mechanic, and shipped out to Japan. During those five years, between the technical work and the distance from home, he started reading books on decision-making, career planning, and long-term thinking. He found a framework he keeps coming back to: ikigai, a Japanese concept that maps the intersection of what you’re good at, what you enjoy, what the world needs, and what you’re paid to do.

“Your ikigai is the thing where all of those overlap,” he says. Engineering was already in the picture. The question was what kind.

Chasing the Signal

The answer arrived through research and a company Caradine stumbled on while scanning the landscape of emerging aerospace technology. They were using magnets to spin a launch system to 14,000 or 15,000 RPM and release small satellites into orbit, recovering the energy on the way down through the same magnetic system. “I thought that was awesome,” he recalls. “So, I started looking into aerospace engineering, and it was a good fit.”

Once he had the field, the destination wasn’t hard to find. Caradine transferred to Embry-Riddle Aeronautical University’s Daytona Beach campus to study aerospace engineering and immediately started showing up everywhere he could — satellite conferences at Kennedy Space Center, industry events in Orlando, small satellite gatherings back in Salt Lake City. “I went to all the career fairs, even though I wasn’t looking for a job yet,” he says. “I just wanted to learn as much as I could, as fast as I could.”

At every NASA booth, he asked questions. He learned about Pathways, the program that places undergraduate and graduate students at NASA centers with the potential to convert to full-time civil service positions, but he waited a year to apply. “I hadn’t really done the things I wanted to do in order to write a strong application yet,” he says. He wrote the next application with the intention of using it as a practice run. He got in.

His reason for choosing NASA over industry was simple and firm. “NASA doesn’t work for profit,” he says. “We’re here to remove barriers so that industry can eventually do the things they weren’t able to do before.”

“Human beings are far more capable than we give ourselves credit for. A journey of a thousand miles starts with a single step and can only be taken one step at a time.”

Work Worth Doing

At NASA Langley, Caradine is part of the Systems Analysis and Concepts Directorate, where “we help agency leaders figure out why they should make certain decisions, especially those that have lots of moving parts,” he explains. Specifically, he works with the in-space servicing, assembly, and manufacturing (ISAM) team, a group focused on the emerging field of building and maintaining infrastructure in space, rather than simply launching and discarding it.

A major part of his summer was curating the State of Play, a comprehensive document that consolidates everything happening in the ISAM sector across government, academia, and industry into a single, navigable resource.

“Jaden joined the team and immediately contributed to this year’s State of Play update,” says Dale Arney, aerospace engineer and Caradine’s mentor. “He also created an automated tool that will help the team create future updates more quickly.”  

That tool scrapes aerospace news from across the web, compiles relevant updates into organized tables, and produces a readable summary on a regular cadence. “It kind of replaced the need for everyone on the team to spend 30 or 40 minutes every day scrolling through news to keep up,” he says.

“Jaden was constantly looking for ways to improve himself, the team, and our products,” Arney adds. “He was eager to take the lead in trying a number of new processes and ideas to try to make them work for us.” 

No Silos

The thing that surprised Caradine most about NASA Langley had nothing to do with the technical work. He had expected some departmental siloing that could develop in large organizations, where people become experts in narrow areas with limited cross-pollination among teams.

“That’s not something I’ve experienced here,” he says. “We all talk to each other, across all teams. We share resources. We collaborate quite extensively.” He describes a culture that expects everyone to engage with the whole problem, not just their corner of it. “Everyone kind of bounces around on different teams to learn the whole aspect of the problem and support each other.”

For anyone considering the Pathways program, his advice is direct. “Do it,” he says. “Human beings are far more capable than we give ourselves credit for. If it seems like too much, break it down. A journey of a thousand miles starts with a single step and can only be taken one step at a time.”

Caradine heads back to Embry-Riddle as a junior this fall, with plans to return to Langley next summer. Grad school is on the horizon, and he’s exploring programs that nurture important analysis skills for SMAB, including decision, strategic, and systems analysis.

“Before coming here, I was trying to do everything and cast a wide net,” he says. “Now I know what I need to know how to do. That’ll give me the opportunity to focus my efforts on the high-value skill sets.”

On Caradine’s Sci-Fi Shelf

The Sirens of Titan by Kurt Vonnegut

Dungeon Crawler Carl by Matt Dinniman

Caradine’s instinct runs more toward fantasy than science fiction, but this one, he says, hits something real.

“I enjoy the leveling aspect — constantly improving, constantly getting better. In books it might be physical strength, but in reality, strength takes on many different forms. Constant improvement is quite rewarding in real life, as it is in books.”

The audiobook production, he adds, is its own experience: full sound design, character actors, the works. “It’s like listening to a movie.”

The team also recently convinced him to start Dune, by Frank Herbert. He’s about halfway through.

Part of the Systems Analysis and Concepts Directorate at NASA’s Langley Research Center.
Learn more about our work by visiting our website.

Source: www.nasa.gov