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Fans of the Arctic

2026-07-14 04:01

A braided river meanders across the image. Smaller streams empty into the wide channel from either side, forming fan-shaped deposits.
Alluvial fans form along a braided river channel on Severny Island in the Russian Arctic in an image acquired on August 1, 2025, by the OLI (Operational Land Imager) on Landsat 9.
NASA Earth Observatory/Lauren Dauphin

Editor’s Note: Today’s story is the answer to the July Puzzler.

Call it an alluvial face-off. On the southern end of Severny Island in the Russian Arctic, rivers rush down from rugged terrain flanking a broad valley. Upon reaching flatter ground, the waters slow and distribute sediment into cone-shaped features called alluvial fans. Several appear in opposing orientations alongside a braided river in this Landsat 9 image.

Severny Island (Ostrov Severnyy) is a mountainous, uninhabited landmass in the frigid high latitudes of the Northern Hemisphere. Part of the Novaya Zemlya archipelago, the island is largely covered in glacial ice. Some glaciers, especially in the north, terminate in the sea, while others end on land, feeding meltwater into glacial streams.

Sediment-laden streams, along with the island’s topography, create favorable conditions for the formation of alluvial fans. The features typically appear at the base of steep mountain ranges, where narrow river channels open onto flatter terrain. There, rivers can slow, divide into smaller channels, and deposit sediment. Over time, the channels migrate back and forth to build up fan-shaped deposits. Dueling fans line several northwest-southeast-trending valleys in the wider view below.

Ice-capped mountains are interrupted by broad valleys lined with alluvial fans.
A wide view of southern Severny Island in the Russian Arctic shows ice-capped mountains interrupted by broad valleys lined with alluvial fans. The image was acquired on August 1, 2025, by the OLI (Operational Land Imager) on Landsat 9.
NASA Earth Observatory/Lauren Dauphin

Seasonal snowmelt and glacial runoff likely keep Severny’s rivers supplied with ample fan-building material. Hydrologists note that higher river flows during the warmer months, driven by snowmelt, can carry more sediment out of the mountains. Glaciers also produce large volumes of eroded material as they grind downslope, some of which flushes out in meltwater.

Smaller, land-terminating mountain glaciers, like those on southern Severny Island, are particularly prone to melting as the atmosphere warms. Severny’s ice is relatively understudied due to its remoteness, but satellite observations give scientists an understanding of its health. Recent analyses incorporating digital elevation models found that land-terminating glaciers across the Novaya Zemlya archipelago thinned during the 2000s and 2010s, especially at lower elevations.

NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Story by Lindsey Doermann.

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Curiosity Blog, Sols 4941-4947: (Pin)Stripes on the Fourth of July

2026-07-14 01:04

4 min read

Curiosity Blog, Sols 4941-4947: (Pin)Stripes on the Fourth of July

A black and white photograph of the Martian surface taken by the Curiosity rover, showing an expanse of fractured, light-colored bedrock. The rocks are distinctly layered and sedimentary, broken into flat, horizontal slabs and polygonal plates. Darker sand and loose dust fill the crevices and low areas between the rocky outcrops, emphasizing the rough, textured terrain.
NASA’s Mars rover Curiosity acquired this image of the “Cerro Castillo” bedrock outcrop with target “Hornillos” at the bottom center. Curiosity used its Left Navigation Camera on July 1, 2026 — Sol 4942, or Martian day 4,942 of the Mars Science Laboratory mission — at 23:50:44 UTC.
NASA/JPL-Caltech

Written by Deborah Padgett, MSL Operations Product Ground System Task Lead at NASA’s Jet Propulsion Laboratory

Earth planning date: Thursday, July 2, 2026

Curiosity spent the week leading up to the Fourth of July holiday approaching a geologic boundary between a very smooth but somewhat sandy region and a rougher bedrock unit. 

Leaving the polygonal terrain behind, the rover arrived at the first location of the week on Sol 4939 and, on the following sol, 4940, looked for dust devils with Navcam and performed an AEGIS ChemCam laser-spectroscopy observation and Mastcam imaging of a target selected onboard the rover. Unfortunately, there were no large rocks appropriate for brushing with the DRT at this rover stop. 

On Sol 4941, the MAHLI camera imaged “Malpartida” and “Pico del Tunari,” which are both light-colored rock fragments, and APXS performed X-ray spectroscopy on them to determine their composition. ChemCam used active laser spectroscopy to zap the “Kunturiri” light-colored bedrock fragment, while “Mecoyita,” a dark-toned “float” rock, which appears to have been transported into this area from elsewhere, was observed passively. ChemCam also used its telescopic RMI camera to study sedimentary layers at the base of the Cordillera butte. Mastcam obtained several image mosaics on a ridge of sand and rock fragments dubbed “Sitajana.” 

On the following sol, 4942, Mastcam continued its study of “Sitajana,” and ChemCam RMI obtained more views of Cordillera butte. Navcam took a suprahorizon cloud movie and dust-devil movie. Finally, ChemCam obtained laser spectroscopy of the dark bedrock fragment “Toconce” with documentation imagery from Mastcam. Mastcam also imaged “Sierra Vicuña Mackenna” to study a partially uncovered rock shedding sand in an area of small dune ripples. 

On the afternoon of Sol 4942, Curiosity drove about 36 feet (about 11 meters) to the edge of the geologic contact and took post-drive panoramic mosaics with Navcam and Mastcam. These images revealed a field of exposed bedrock outcrops with beautiful pinstriped layers. A Navcam AEGIS observation was taken for onboard selection of a ChemCam laser spectroscopy target. This soil and rock target was observed by ChemCam with Mastcam documentation on Sol 4943. In addition, Navcam performed a dust-devil movie, and Mastcam took an atmospheric dust observation.

For Sol 4944, two adjacent light bedrock targets “Laguna Fea” and “Laguna Lejia” were selected for DRT brushing, MAHLI imaging, and APXS X-ray spectroscopy to determine composition. ChemCam laser spectroscopy will target the darker ledge of bedrock “Hornillos,” with accompanying Mastcam documentation. The investigation of “Hornillos” will include detailed imaging by MAHLI, but it was determined to be too rough for DRT brushing. Mastcam will take a large mosaic of images on the field of striped bedrock outcrop “Cerro Castillo,” as well as a smaller mosaic of a nearby trough. The ChemCam telescopic RMI camera will target a dark layer on butte Cordillera, which appears to be shedding dark boulders. Navcam will take a dust-devil movie and suprahorizon cloud movie.

On Sol 4945, ChemCham will do laser spectroscopy of “Laguna Lejia” with Mastcam image documentation, and the ChemCam RMI telescopic camera will study another area at the base of butte Cordillera where the location of large stones on the slope suggests that ice processes may have played a role. A Navcam dust-devil survey and Mastcam dust-imaging study will also be done. In the afternoon, there will be a Navcam dust-devil survey, zenith observation, and suprahorizon cloud movie, as well as a Mastcam dust observation and 20×4 mosaic image of butte Mishe Mokwa. Overnight, there will be an APXS atmospheric observation lasting many hours.

During Sol 4945, ChemCam will perform laser spectroscopy of target “La Puntilla” with accompanying Mastcam imaging, followed by a ChemCam passive-sky observation. Curiosity will then drive about 56 feet (17 meters) towards a large, dark boulder in the distance, which may be a meteorite, and do post-drive imaging and Navcam sky flats.

On the following morning, there will be an atmospheric observation including a Navcam zenith movie, suprahorizon cloud movie, and line-of-sight dust observation, as well as a Mastcam dust “tau” observation. 

A rover sits on the hilly, orange Martian surface beneath a flat grey sky, surrounded by chunks of rock.
NASA’s Curiosity rover at the base of Mount Sharp
NASA/JPL-Caltech/MSSS

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Last Updated

Jul 13, 2026

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NASA Study Points to Smoother Air Taxi Rides

2026-07-13 21:46

3 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

A brown and yellow platform holding a seat that is raised up in the air is holding one passenger. The passenger is wearing virtual reality goggles and a harness. There is a TV monitor to the right of the monitor showing the words “liftoff” and a second screen behind the passenger.
Matt Kamlet, an employee at NASA’s Armstrong Flight Research Center in Edwards, California, sits atop the virtual reality passenger ride quality simulator during a study of air taxi motion Monday, Dec. 15, 2025. NASA recently completed a multi-year study to understand how large, sudden air taxi motion affects ride comfort.
NASA/Christopher LC Clark

No one wants to get into an uncomfortable aircraft. NASA research could help the emerging industry of air taxis —small, vertical-takeoff-and-landing aircraft meant for short trips — understand the relationship between comfort and willingness to fly.

That’s where NASA comes in, with data that can help identify how to plan air taxi rides that can keep travelers feeling good.

NASA was able to gather that data by putting its own employees through some rough virtual flights. At the agency’s Armstrong Flight Research Center in Edwards, California, volunteers have been strapping into a virtual reality motion simulator to experience the sudden shifts and tilts that tomorrow’s air taxis could encounter, showing researchers those moments feel from a passenger’s point of view.

Their reactions are giving NASA new insight into how aircraft motion influences comfort and confidence in flight — for instance, that certain kinds of large, sudden motions can be especially bothersome. Using that data, the team developed new models linking those sudden motions to passengers’ willingness to fly. The models can help guide future aircraft design and flight operations, letting producers know what maneuvers will be too jarring for future air taxi riders.

Large, sudden movements can also come from gusting winds or landings. The NASA data allows researchers to estimate when passengers may begin to feel uncomfortable as motion increases, giving them the ability to shape aircraft designs and operations to minimize the impact of those situations.

“Through this study and others, we are starting to identify passenger comfort thresholds for aggressive flight motion,” said Curtis Hanson, NASA Armstrong lead researcher for this effort. “We can begin to make predictions about how air taxis should fly so that most passengers will find the experience enjoyable and want to ride again, which will benefit the public and the industry.”

In the simulator, each participant experienced four levels of their aircraft pitching up and down, tilting from side-to-side, rotating, or accelerating quickly into a climb or a dive during flights from downtown San Francisco to Alcatraz Island in California. Even moderate changes in these motions reduced comfort for some participants, while others remained comfortable at higher levels. Participants rated each flight on a five-point scale and identified which motions felt uncomfortable.

Participants were asked whether they would take a real air taxi flight with motion they find uncomfortable. Their answers suggested that today’s travelers may be less tolerant of rough motion than airline passengers 50 years ago, based on comparisons with earlier NASA ride-quality research.

This latest feedback builds on a multiyear NASA study to better understand air taxi passenger comfort. The overall research effort found clear relationships between specific aircraft motions and how comfortable people feel during flight.

This work is currently led under the Subsonic Vehicle Technologies and Tools project in NASA’s Research and Technology Mission Directorate and contributes to the agency’s advanced air mobility research.

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Last Updated
Jul 13, 2026
Editor
Dede Dinius
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NASA Astronaut Anil Menon

2026-07-13 15:11

Astronaut Anil Menon
NASA/Robert Markowitz

NASA astronaut Anil Menon poses in a spacesuit for a portrait at NASA’s Johnson Space Center in Houston, Texas on Jan. 8, 2026. Menon will launch aboard the Roscosmos Soyuz MS-29 spacecraft to the International Space Station on Tuesday, July 14, accompanied by cosmonauts Pyotr Dubrov and Anna Kikina, where they will join the Expedition 74 crew advancing scientific research. During his stay on the station, Menon will conduct scientific research and technology demonstrations aimed at advancing human space exploration and benefiting life on Earth.

Learn more about the launch, including where and when to watch.

Image credit: NASA/Robert Markowitz

NASA’s Hubble Discovers First of Star Cluster’s Missing Black Holes

2026-07-13 14:00

5 Min Read

NASA’s Hubble Discovers First of Star Cluster’s Missing Black Holes

An image of the globular cluster Omega Centauri, a collection of myriad stars colored red, white, and blue on the black background of space.

An image of the globular cluster Omega Centauri, a collection of myriad stars colored red, white, and blue on the black background of space.

Credits:
Science: Maximilian Häberle (MPIA)

The massive globular star cluster Omega Centauri has puzzled astronomers for decades. It should be filled with black holes left behind by exploding stars, yet evidence for them is scarce. Now, astronomers using archival data from NASA’s Hubble Space Telescope and supportive observations from NASA’s James Webb Space Telescope have finally located their first stellar-mass black hole in this cluster. Discovering the first of this missing black hole population will help refine current theories on black hole formation within environments such as Omega Centauri. The team’s findings published Monday in The Astrophysical Journal Letters.

Omega Centauri is composed of 10 million gravitationally bound stars. Though the astronomical community previously found evidence with Hubble that an intermediate-mass black hole lurks at its center, models suggest this star cluster should also contain about 10,000 smaller, stellar-mass black holes. This notable population of black holes evaded detection in previous observational studies, which used the radial velocity method or looked for radio and X-ray emission from material falling onto black holes.

This new discovery features a different approach, known as astrometry, to measure very small movements of stars over time. By sifting through more than 20 years of Hubble archival data and pulling in recent Webb data to further refine their astrometric measurements, the team located a star orbiting an invisible object so hefty that it has to be a black hole. Dubbed oMEGACat BH-2, it is the first stellar-mass black hole detected in Omega Centauri, and it has some surprising qualities. oMEGACat BH-2 has a lower-than-expected mass and, with its visible star companion, the black hole-star duo has the longest orbital period of any black hole binary system known to date.

“With Hubble and Webb data, we were able to see the motion of the visible main sequence star that is part of this binary, which is about 18,000 light-years away in the dense environment of Omega Centauri,” said Matthew Whitaker of the University of Utah, Salt Lake City, lead author of the paper. “The precision of these measurements is incredible, down to a fraction of a pixel on Hubble and Webb’s detectors. It would not have been possible to find this black hole without these two space telescopes.”

A Hubble image of globular star cluster Omega Centauri, which looks like a dense field of stars. Some stars appear a bit larger and brighter than others; most appear blue, orange, or yellow. The colors appear uniformly distributed, like grains of sand. Stars toward the clusteru2019s center are packed closer together, creating a more luminous area at the globular clusteru2019s core. A small red square frame is superimposed on the cluster near the imageu2019s center. It connects to a square pullout in the top-right corner, which shows the outlined area in greater detail. Among the blue- and orange-colored stars is small blue-white dot highlighted by a small red circle.
Astronomers found Omega Centauri’s first stellar-mass black hole, which has a visible star companion that is shown in greater detail. They used 20-plus years of data from NASA’s Hubble Space Telescope and recent data from NASA’s James Webb Space Telescope to make the discovery.
Image: ESA, NASA, Maximilian Häberle (MPIA), Joseph DePasquale (STScI)

The team’s findings refine a past study by a different group of scientists that suggested this binary system included a neutron star. By expanding Hubble data from the earlier investigation with archival Hubble astrometric measurements from 2002 to 2023, and pulling in Webb near-infrared data to improve precision, the University of Utah-led team was able to better constrain the mass of the visible star’s dark companion, ruling out the neutron star possibility.

“While we already knew that the star was 0.78 solar masses, we can now calculate the black hole’s mass, which is 4.46 solar masses and therefore too heavy to be a neutron star. However, its mass is much lower than would be expected in a metal-poor environment like Omega Centauri. This is surprising and exciting,” said Anil Seth of the University of Utah, a coauthor of the study. “We now know that a metal-poor star is able to form a black hole like this, and we need to figure out how that happens. This detection is providing some data to those who do that kind of modeling.”

Long time coming

Based on the precise data from Hubble and Webb, the team could chart the star’s path over 20-plus years, during its closest approach to its black hole companion when it moved the fastest across the sky. From the extensive data, the team determined that the visible star orbits oMEGACat BH-2 once every 94 years, making it the longest-period black hole binary ever known.

Its long orbital period also gives a clue to the origin of this binary system. It was probably dynamically formed, meaning the star and its black hole companion did not start out together but rather found each other in this cluster. The researchers calculated that a system like oMEGACat BH-2 will survive for less than a billion years before it is torn apart by encounters with nearby stars, a much shorter span than the age of the cluster (approximately 12 billion years old).

“It’s important to understand black hole populations in globular clusters because there’s uncertainty about their physics and formation,” said Seth. “More specifically, understanding the process of forming black holes and then dynamically forming binaries is vital, because it affects our ability to interpret and understand gravitational wave events. Environments like Omega Centauri are the primary places where we think binaries are merging and creating these waves.”

The team’s discovery of stellar-mass black hole oMEGACat BH-2 with the Hubble-Webb dataset is just the start of finding these evasive black hole populations in globular star clusters.

“With Hubble and Webb, we can continue to look at Omega Centauri and expand our search for similar systems within other clusters,” said Whitaker. “We’re also very excited for the launch of NASA’s Nancy Grace Roman Space Telescope because it will image the crowded galactic bulge, including the galactic center, very regularly with Hubble-like resolution and with a much wider field of view. We’re hoping we’ll be able to find black hole binary systems like this one because of the regular cadence of Roman’s observations.”

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, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.


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Last Updated

Jul 13, 2026

Editor
Andrea Gianopoulos
Contact

Media

Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov

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