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Curiosity Blog, Sols 4568-4569: A Close Look at the Altadena Drill Hole and Tailings
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Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 2 min read
Curiosity Blog, Sols 4614-4615: Driving Along the Boxwork
NASA’s Mars rover Curiosity acquired this image, looking out in the direction from where it came, with the rover’s tracks visible through the dust and sand covering the ground. Curiosity acquired this image using its Left Navigation Camera on July 28, 2025 — Sol 4612, or Martian day 4,612 of the Mars Science Laboratory mission — at 00:27:23 UTC. NASA/JPL-Caltech Written by Conor Hayes, Graduate Student at York University
Earth planning date: Monday, July 28, 2025
Today was a pretty straightforward day of planning. Our drive over the weekend completed successfully, and we quickly confirmed that we are parked in a stable position. Thus, we were able to unstow the rover’s arm to poke around in our new workspace, which features a large sand-filled fracture. Aside from all of the good geology work to be done, the view from our current location is quite spectacular.
We’re still in the time of year where the atmosphere at Gale is reasonably dust-free (at least, compared to later in the year), allowing us to look all the way out to and beyond the Gale crater rim. The upper slopes of Mount Sharp have also re-emerged to our east after spending months hidden behind the walls of Gediz Vallis. There’s a bit more sand and dust in this location than we’ve seen recently, so we can also see the trail left behind by the rover’s wheels as we drove to this location (see the image above).
We’re still deep in our examination of the boxwork structures that we’re now driving through, so most of Curiosity’s attention in this plan is focused much closer to the rover than any of the scenic vista surrounding us. APXS, DRT, and MAHLI will all take a look at “Cañón de Palca,” some bedrock close to the large fracture in this workspace. Mastcam and ChemCam RMI will image some boxwork ridges at “Caine,” and will also collaborate on imaging of the weekend’s post-drive AEGIS target and a LIBS bedrock target “Doña Ines.” Mastcam’s solo activities include taking a look at some layering at “Paniri butte” and at MAHLI to examine a speck of dust that may have fallen on the lens.
We’ll be driving away from this location along one of the boxwork ridges, which, at about 5 meters (about 16 feet) wide, is more than large enough to fit our car-sized rover. Post-drive activities are largely focused on environmental monitoring, including Navcam line-of-sight and dust-devil surveys to look at dust, and several Navcam cloud movies. As usual, ChemCam will also join the post-drive fun with an AEGIS observation. More environmental monitoring by REMS, RAD, and DAN fill out the remainder of this plan.
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Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 2 min read
Curiosity Blog, Sols 4611-4613: Scenic Overlook
NASA’s Mars rover Curiosity acquired this image, sitting on top of the distinctive ridge-and-hollow terrain of the boxwork-forming unit for a panoramic view, on July 24, 2025. Curiosity used its Right Navigation Camera on Sol 4609, or Martian day 4,609 of the Mars Science Laboratory mission, at 21:29:43 UTC. NASA/JPL-Caltech Written by Lucy Lim, Planetary Scientist at NASA’s Goddard Space Flight Center
Earth planning date: Friday, July 25, 2025
A 23-meter drive (about 75 feet) brought Curiosity to today’s planned “look-about” spot. The highlight of the plan will be the 360-degree Mastcam panorama that will document the ridge-and-hollow topography of the boxwork-forming unit we’ve been exploring, in addition to overlying stratigraphy in some of the nearby buttes. The right-angle ridge pattern is quite prominent in the HiRISE orbital imaging, which enabled us to plan for this stop. It has been 70 sols since the last panorama and the rover has driven quite some distance in that time!
Additional detailed imaging was planned with the ChemCam remote imager (RMI) and Mastcam high-resolution M100: mosaics will cover the exposed strata underneath the ridge we’re planning to drive on (“Arequipa Airport”), two linear fractures, one parallel to the large ridge and one cross-cutting it (“Laguna de Salinas” and “Laguna Santa Rosa”), some troughs around a nearby light-toned float block (“Arubai”), and the Uyuni butte in the middle distance.
The bedrock texture here was a noticeable change from the previous workspace, with a knobbly oriented texture interspersed occasionally with platier exposures. Geochemical measurements were planned with the ChemCam LIBS to complement the auto-targeted post-drive AEGIS measurement: “La Coca” on a block that appeared to show unusual colors, and “El Algodón” on a knobbly textured chunk of bedrock. APXS geochemistry was planned with dust removal on the “Yura Tuff” knobbly target and without dust removal on the “Tipnis” target. MAHLI will also provide close-up imaging on the two APXS targets.
For the modern Martian environment, it’s still the cloudy season at Gale so we are planning several cloud-related activities. The Mastcam sky survey will measure abundances of atmospheric dust and water ice, whereas a special cloud altitude observation will include video of clouds and their shadows so that the altitudes and velocities of the clouds and related winds can be calculated. A separate short movie will search for dust lifting (dust devil) activity. Finally, the usual passive REMS and DAN observations will monitor the temperature, humidity, and neutron environment at Curiosity’s current location.
For more Curiosity blog posts, visit MSL Mission Updates
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Curiosity Blog, Sols 4609–4610: Recharged and Ready To Roll Onwards
NASA’s Mars rover Curiosity acquired this image showing the boxwork hollow where it is investigating, and the boxwork ridge on the far side of the hollow, using its Left Navigation Camera. Curiosity captured the image on July 20, 2025 — Sol 4605, or Martian day 4,605 of the Mars Science Laboratory mission — at 18:51:55 UTC. NASA/JPL-Caltech Written by Catherine O’Connell-Cooper, Planetary Geologist at University of New Brunswick
Earth planning date: Wednesday, July 23, 2025
For today’s planning, we were in the same workspace as the Monday plan — on purpose! We don’t often have a plan without a drive but in order to allow the battery to recover from some power-hungry SAM atmospheric measurements over the weekend and on Monday, we needed to stay put and skip our usual drive. As a result, we gained a bonus planning cycle at this interesting workspace.
We are in one of the “hollows” between the resistant ridges of the “boxwork” terrain, as you can see in the image for this blog. This made for a quieter Operations day for me as the APXS planner. As Deborah noted in Monday’s blog, we have already gotten three APXS and MAHLI measurements in this workspace, so we didn’t acquire more in this plan.
This morning, we focused on documenting some small light-toned, rounded, white pebbles in the workspace (you can see them in the accompanying Navcam image), which look very different from the underlying bedrock. We used our one ChemCam LIBS analysis for the plan on “Yana Qaqa.” Mastcam will image this pebble, another at “Ojos del Salado,” and a really cool-looking target with a dendritic-looking texture at “Punta de Lobos.”
Further afield, Mastcam will image the adjacent boxwork ridge and hollow in our drive direction, and a series of troughs with raised edges to the right of our current workspace. ChemCam will image a long-distance RMI mosaic of “Cueva de los Vencejos y Murciélagos,” which was imaged by Mastcam on Monday, and also acquire some further images of the “Mishe Mokwa” hill.
We had a bumper couple of sols of atmospheric measurements over the weekend and Monday. Now we revert back to our more normal environmental and atmospheric monitoring. These do not get as much attention sometimes as the amazing images we take of the fascinating rocks we see, but have been taking place consistently and continuously since Curiosity’s landing almost 13 years ago now. This plan includes a series of Navcam movies (suprahorizon, dust devil) and a line-of-sight observation of dust, standard REMS and DAN observations, and two Mastcam tau measurements, looking at dust in the atmosphere.
Our 24-meter drive (almost 79 feet) will take us out of this hollow and back up on top of a ridge. From here, we hope to be able to spy the best driving path through the boxwork. The ridges are up to 5 meters in diameter (about 16 feet), so we are cautiously hopeful that we can just trundle along one of the ridges as we investigate this fascinating terrain.
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Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Hubble and Artificial Intelligence Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts Multimedia Images Videos Sonifications Podcasts e-Books Online Activities 3D Hubble Models Lithographs Fact Sheets Posters Hubble on the NASA App Glossary News Hubble News Social Media Media Resources More 35th Anniversary Online Activities 6 Min Read NASA’s Hubble, Chandra Spot Rare Type of Black Hole Eating a Star
NASA’s Hubble Space Telescope and NASA’s Chandra X-ray Observatory team up to identify a possible intermediate-mass black hole. Credits:
NASA, ESA, CXC, Yi-Chi Chang (National Tsing Hua University); Image Processing: Joseph DePasquale (STScI) NASA’s Hubble Space Telescope and NASA’s Chandra X-ray Observatory have teamed up to identify a new possible example of a rare class of black holes. Called NGC 6099 HLX-1, this bright X-ray source seems to reside in a compact star cluster in a giant elliptical galaxy.
Just a few years after its 1990 launch, Hubble discovered that galaxies throughout the universe can contain supermassive black holes at their centers weighing millions or billions of times the mass of our Sun. In addition, galaxies also contain as many as millions of small black holes weighing less than 100 times the mass of the Sun. These form when massive stars reach the end of their lives.
Far more elusive are intermediate-mass black holes (IMBHs), weighing between a few hundred to a few 100,000 times the mass of our Sun. This not-too-big, not-too-small category of black holes is often invisible to us because IMBHs don’t gobble as much gas and stars as the supermassive ones, which would emit powerful radiation. They have to be caught in the act of foraging in order to be found. When they occasionally devour a hapless bypassing star — in what astronomers call a tidal disruption event— they pour out a gusher of radiation.
The newest probable IMBH, caught snacking in telescope data, is located on the galaxy NGC 6099’s outskirts at approximately 40,000 light-years from the galaxy’s center, as described in a new study in the Astrophysical Journal. The galaxy is located about 450 million light-years away in the constellation Hercules.
A Hubble Space Telescope image of a pair of galaxies: NGC 6099 (lower left) and NGC 6098 (upper right). The purple blob depicts X-ray emission from a compact star cluster. The X-rays are produced by an intermediate-mass black hole tearing apart a star. Science: NASA, ESA, CXC, Yi-Chi Chang (National Tsing Hua University); Image Processing: Joseph DePasquale (STScI) Astronomers first saw an unusual source of X-rays in an image taken by Chandra in 2009. They then followed its evolution with ESA’s XMM-Newton space observatory.
“X-ray sources with such extreme luminosity are rare outside galaxy nuclei and can serve as a key probe for identifying elusive IMBHs. They represent a crucial missing link in black hole evolution between stellar mass and supermassive black holes,” said lead author Yi-Chi Chang of the National Tsing Hua University, Hsinchu, Taiwan.
X-ray emission coming from NGC 6099 HLX-1 has a temperature of 3 million degrees, consistent with a tidal disruption event. Hubble found evidence for a small cluster of stars around the black hole. This cluster would give the black hole a lot to feast on, because the stars are so closely crammed together that they are just a few light-months apart (about 500 billion miles).
The suspected IMBH reached maximum brightness in 2012 and then continued declining to 2023. The optical and X-ray observations over the period do not overlap, so this complicates the interpretation. The black hole may have ripped apart a captured star, creating a plasma disk that displays variability, or it may have formed a disk that flickers as gas plummets toward the black hole.
“If the IMBH is eating a star, how long does it take to swallow the star’s gas? In 2009, HLX-1 was fairly bright. Then in 2012, it was about 100 times brighter. And then it went down again,” said study co-author Roberto Soria of the Italian National Institute for Astrophysics (INAF). “So now we need to wait and see if it’s flaring multiple times, or there was a beginning, there was peak, and now it’s just going to go down all the way until it disappears.”
The IMBH is on the outskirts of the host galaxy, NGC 6099, about 40,000 light-years from the galaxy’s center. There is presumably a supermassive black hole at the galaxy’s core, which is currently quiescent and not devouring a star.
Black Hole Building Blocks
The team emphasizes that doing a survey of IMBHs can reveal how the larger supermassive black holes form in the first place. There are two alternative theories. One is that IMBHs are the seeds for building up even larger black holes by coalescing together, since big galaxies grow by taking in smaller galaxies. The black hole in the middle of a galaxy grows as well during these mergers. Hubble observations uncovered a proportional relationship: the more massive the galaxy, the bigger the black hole. The emerging picture with this new discovery is that galaxies could have “satellite IMBHs” that orbit in a galaxy’s halo but don’t always fall to the center.
Another theory is that the gas clouds in the middle of dark-matter halos in the early universe don’t make stars first, but just collapse directly into a supermassive black hole. NASA’s James Webb Space Telescope’s discovery of very distant black holes being disproportionately more massive relative to their host galaxy tends to support this idea.
However, there could be an observational bias toward the detection of extremely massive black holes in the distant universe, because those of smaller size are too faint to be seen. In reality, there could be more variety out there in how our dynamic universe constructs black holes. Supermassive black holes collapsing inside dark-matter halos might simply grow in a different way from those living in dwarf galaxies where black-hole accretion might be the favored growth mechanism.
“So if we are lucky, we’re going to find more free-floating black holes suddenly becoming X-ray bright because of a tidal disruption event. If we can do a statistical study, this will tell us how many of these IMBHs there are, how often they disrupt a star, how bigger galaxies have grown by assembling smaller galaxies.” said Soria.
The challenge is that Chandra and XMM-Newton only look at a small fraction of the sky, so they don’t often find new tidal disruption events, in which black holes are consuming stars. The Vera C. Rubin Observatory in Chile, an all-sky survey telescope from the U.S. National Science Foundation and the Department of Energy, could detect these events in optical light as far as hundreds of millions of light-years away. Follow-up observations with Hubble and Webb can reveal the star cluster around the black hole.
The Hubble Space Telescope has been operating for more than 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.
Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Related Images & Videos
NGC 6099 (Hubble + Chandra)
A Hubble Space Telescope image of a pair of galaxies: NGC 6099 (lower left) and NGC 6098 (upper right). The purple blob depicts X-ray emission from a compact star cluster. The X-rays are produced by an intermediate-mass black hole tearing apart a star.
NGC 6099 (Hubble)
A Hubble Space Telescope image of a pair of galaxies: NGC 6099 (lower left) and NGC 6098 (upper right). The white dot labeled HLX-1 is the visible-light component of the location of a compact star cluster where an intermediate-mass black hole is tearing apart a star.
NGC 6099 Compass Image
This compass image shows two elliptical galaxies, NGC 6098 at upper right and NGC 6099 at lower left. The fuzzy purple blob at bottom center shows X-ray emission produced by an intermediate-mass black hole tearing apart a star.
HLX-1 Illustration
This sequence of artistic illustrations, from upper left to bottom right, shows how a black hole in the core of a star cluster captures a bypassing star and gravitationally shreds it until there is an explosion, seen in the outskirts of the host galaxy.
HLX-1 Animation
This video is an illustration of an intermediate-mass black hole capturing and gravitationally shredding a star. It begins by zooming into a pair of galaxies. The galaxy at lower left, NGC 6099, contain a dense star cluster at center. The video then zooms into the heart of the cl…
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Last Updated Jul 24, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Contact Media Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov
Ray Villard
Space Telescope Science Institute
Baltimore, Maryland
Related Terms
Hubble Space Telescope Astrophysics Astrophysics Division Black Holes Chandra X-Ray Observatory Galaxies Goddard Space Flight Center Marshall Astrophysics Marshall Space Flight Center
Related Links and Documents
Chinese translation of release Science Paper: Multiwavelength Study of a Hyperluminous X-Ray Source near NGC6099: A Strong IMBH Candidate, PDF (1.81 MB)
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