Category: Behind The Black

September 1, 2023 Quick space links

5:05 pm

Courtesy of BtB’s stringer Jay.

 

 

 

  • The Perseverance team posts another dumb tweet making believe the rover is some cute person

    • The tweet includes an image looking towards the western rim of Jezero Crater, but they don’t tell us that. Instead, the tweet says: “I’ve had a great time here poking around the ancient riverbed. Gonna wrap up a few tasks and hit the road soon. What’s over this next rise? Let’s find out”

    Jay writes, “I really don’t care for them to make Perseverance sound like a person. Don’t get me wrong, it is a marvelous piece of engineering, but it is not a person. I know they do this to make Mars more interesting to the general public.”

    I say, “Why are you insulting my intelligence?” Not only isn’t Perseverance a person, to make believe it is on the stupid assumption that is the only way anyone will become interested reveals your utter contempt for the general public. Please stop!

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Real pushback: School district immediately cancels ban on prayer when threatened with lawsuit

1:27 pm

The First Amendment, becoming accepted once again
The First Amendment, becoming accepted once again

Bring a gun to a knife fight: When the officials at West Shore School District in Pennsylvania sent out a letter to the presidents of the various booster clubs at its schools ordering them to “halt prayers at future banquets, and at any other school-sponsored activity” and claiming falsely that “student-initiated prayers at school events are illegal,” two non-profit free speech legal firms, First Liberty and the Independence Law Center teamed up to immediately send a letter to the district challenging that order:

First Liberty and our friends at the Independence Law Center quickly sent a letter to district officials asking them to immediately rescind that threatening letter. Our legal team offered to help draft a new letter and policies to ensure the district would not illegally discriminate against students and staff.

We explained in our letter that the First Amendment prohibits a school district from acting in a hostile manner toward religious belief.

To my readers this story is familiar. What has normally happened next in the past few years — since censorship and blacklisting has become all the rage by those in power — is that the government officials either ignore the letter or publicly defy it. Sometimes they double down and actually fire someone for exercising their First Amendment rights. What follows next is of course a lawsuit, which almost routinely ends in a crushing defeat for the school that costs it significantly in damages.

This story however ended quite differently:
» Read more

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Petrified dunes on Mars?

11:27 am

Petrified dunes on Mars?
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on May 31, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

I think the many parallel ridges are likely hardened and petrified dunes of sand because of their craggy nature. Dunes of sand would have a smoother, softer look, and in fact, if you look at some of the dunes inside the depression at the bottom-right of the picture you will see ridges with exactly that look, smooth and curved.

Nor is it unreasonable to believe these ridges are petrified dunes, as orbital data over time has found that many of the dunes on Mars, even those that look active, are not and have likely been hardened for centuries.

As for the ridges running at right angles to each other in the picture’s middle left, I have no idea. Possible we are looking at ancient dykes of lava that pushed up through cracks and faults, but this is pure guess.
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Ingenuity completes 56th flight on Mars

9:52 am

Overview map
Click for interactive map.

According to a tweet yesterday by the Ingenuity engineering team, the helicopter successfully completed its 56th flight on Mars on August 25, 2023, flying 1,345 feet to the northwest at a height of 39 feet for 141 seconds, or two minutes and twenty-one seconds. The distance traveled and the flight time were slightly longer than planned, but that likely was because the helicopter used that extra time to determine a safe landing site.

The green line on the map above shows the approximate new position of Ingenuity, positioned close to the planned route of Perseverance as indicated by the red dotted line. Perseverance’s present location is marked by the blue dot.

Neretva Vallis is the gap in the western rim of Jezero crater through which the delta had flowed eons before, and is the rover’s eventual target in order to begin exploring the terrain beyond, known to be very rich in mineral content.

Meanwhile, the Ingenuity engineering team has already released its flight plan for the 57th flight, heading north about 670 feet and targeting tomorrow for flight.

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LRO spots Luna-25 crash site on Moon

9:23 am

Luna-25 crash site identified by LRO
Click for interactive map.

Using the rough location data provided by Russian engineers, the Lunar Reconnaissance Orbiter (LRO) science team has successfully located a new small impact point on the Moon at that location in that they think is the crash site of Luna-25.

The inset in the map to the right shows that impact, with its location on the Moon indicated. The red dot marks the planned landing site in Boguslawsky crater in the high southern latitudes.

LRO’s most recent “before” image of the area was captured in June 2022; thus, the crater formed sometime after that date. Since this new crater is close to the Luna 25 estimated impact point, the LRO team concludes it is likely to be from that mission, rather than a natural impactor.

The new crater is about 10 meters in diameter and is located at 57.865 degrees south latitude and 61.360 degrees east longitude at an elevation of about minus 360 meters. The impact point was on the steep (greater than 20-degree grade) inner rim of Pontécoulant G crater, about 400 kilometers short of Luna 25’s intended landing point at 69.545 degrees south, 43.544 degrees east.

Luna-25 failed when, during its last orbital adjustment prior to attempting its landing, its engines fired for too long. Instead of adjusting the orbit, the burn de-orbited the spacecraft. As it was not programmed to attempt its landing sequence, it crashed.

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Amazon investors sue company for not considering SpaceX as potential launch provider

8:56 am

In a lawsuit filed by Amazon investors, they claim that the company’s decision to give major and expensive launch contracts to Arianespace, ULA, and Blue Origin to put its planned 3,200 Kuiper satellite constellation into orbit but never even consider using SpaceX indicates a failure at due diligence for the shareholders as well as a possible conflict of interest.

The plaintiff’s biggest concern was the decision to give Blue Origin the contract.

The suit, filed by Amazon shareholders the Cleveland Bakers and Teamsters Pension Fund, alleges that the board spent less than 40 minutes approving the launch agreements for Amazon’s Project Kuiper mega-constellation, while not even considering leading launch company (and Blue Origin rival) SpaceX. “Amazon’s directors likely devoted barely an hour before blindly signing off on funneling […] Amazon’s money to Bezos’ unproven, struggling rocket company,” the suit says. The plaintiffs say the board failed to protect the negotiation process “from Bezos’ glaring conflict of interest.”

It appears these investors might have a point, as so far Amazon has paid these launch companies about $1.7 billion, with Blue Origin getting $585 million, though not one satellite has yet launched. Moreover, it appears from all counts that it will be very difficult for these companies — especially Blue Origin — to complete the required missions necessary to get into orbit half of Amazon’s constellation by 2026, as required by its FCC license.

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SpaceX successfully launches 22 more Starlink satellites

7:54 pm

SpaceX tonight successfully launched another 22 Starlink satellites, its Falcon 9 rocket lifting off from Cape Canaveral.

The first stage successfully completed its seventh flight, landing on a drone ship in the Atlantic. Note too the speed in which SpaceX was able to resume launches after Hurricane Idalia plowed across Florida. ULA’s canceled a launch earlier in the week, but it can’t move as fast to resume launches.

The leaders in the 2023 launch race:

60 SpaceX
38 China
12 Russia
7 Rocket Lab

In the national rankings, American private enterprise now leads China in successful launches 69 to 38. It also leads the entire world combined, 69 to 61, while SpaceX by itself now trails the rest of the world (excluding American companies) only 60 to 61 in successful launches.

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August 31, 2023 Quick space links

4:02 pm

Courtesy of BtB’s stringer Jay.

 

  • NASA: “Our Deep Space Network (DSN) is dying because of budget cuts!”

    • There is no link above because this whining has been amplified by two articles that Jay sent, one in Space News and the other in Ars Technica. Both articles naively buy NASA’s pitch with little or no skepticism, even though NASA has successfully completed some major upgrades of the DSN in recent years, and its own budget will remain stable next year despite deep cuts being pushed by the House in almost all other government agencies. Note too that NASA’s budget now is about 30% higher than just ten years ago, an increase well above inflation.

 

 

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Pushback: Class action discrimination lawsuit filed against Gannett newspaper

1:34 pm

The Gannett logo abandoned in 2011
This Gannett logo was abandoned in 2011, for
one that eliminated any mention of equal employment.
We now know why.

“Segregation today, segregation tomorrow, segregation forever!” In what is certainly going to the beginning of a wave of lawsuits, five current and former Gannett employees, all white, have filed a class action lawsuit against the company, claiming its quota policies instituted in 2020 following the death of George Floyd are racist and discriminatory, favoring minorities over whites simply because of their race.

In the lawsuit, plaintiff Steven Bradley says he was fired from a management job at the Democrat and Chronicle newspaper in Rochester, New York, and then passed over for a different position with Gannett because he is white. Bradley in April filed a similar lawsuit against Gannett in New York state court. The status of that case was unclear.

Another plaintiff, Logan Barry, says he was in line for promotion to a leadership position at the Progress-Index in Petersburg, Virginia. After Gannett acquired the newspaper in 2019, the job went to a Black woman with fewer qualifications, according to the lawsuit.

The plaintiffs accused Gannett of violating a federal law prohibiting race discrimination in contracts. They are seeking to require Gannett to eliminate the 2020 policy, along with lost pay and benefits and other money damages.

» Read more

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The splatter surrounding a mid-latitude Martian crater

12:26 pm

A channel in the splatter of a Martian crater
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on April 12, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists simply label as “Northern Mid-latitude Terrain”.

I have focused in on that meandering channel and the landscape around it. On Earth we would assume that channel marks the drainage of a river or stream, possibly also shaped by a glacier at some point because of its U-shaped profile. This guess is strengthened by the elevation data from MRO, which shows the channel descending to the southwest about 440 feet along its 2.2 mile length.

The channel and the eroded look of the surrounding terrain suggests strongly the presence of near-surface ice at this location, which is not unreasonable based on its 32 degree north latitude. The wider look below only adds further strength to this hypothesis, but also adds a lot more details explaining the genesis of this strange landscape.
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Webb takes infrared image of Supernova SN1987A

10:04 am

Annotated infrared image from Webb
Click for original image.

The Webb Space Telescope has taken its first infrared image of Supernova SN1987A, the closest supernova to Earth in five centuries at a distance of 168,000 light years away in the nearby Large Magellanic Cloud.

The annotated image to the right, cropped, reduced, and sharpened to post here, shows that supernova remnant as Webb sees it. Most of the structures identified here have been observed now for decades as the material from the explosion has been expanding outward. However,

While these structures have been observed to varying degrees
by NASA’s Hubble and Spitzer Space Telescopes and Chandra X-ray Observatory, the unparalleled sensitivity and spatial resolution of Webb revealed a new feature in this supernova remnant – small crescent-like structures. These crescents are thought to be a part of the outer layers of gas shot out from the supernova explosion. Their brightness may be an indication of limb brightening, an optical phenomenon that results from viewing the expanding material in three dimensions. In other words, our viewing angle makes it appear that there is more material in these two crescents than there actually may be. [emphasis mine]

I highlight that one word because it is unnecessary, and is only inserted to punch up Webb’s abilities for public relations purposes. Moreover, the rest of the text of the full press release at the link is even worse. It provides little information about the evolution of this supernova since its discovery more than three decades ago, but instead waxes poetic again and again about how wonderful Webb is.

Though Webb certainly has much higher resolution than the earlier infrared space telescope Spitzer and can do far more, this tendency of NASA press releases to use these superlatives only devalues Webb. The images themselves sell the telescope. No need to oversell it in the text.

Meanwhile, the significance of SN 1987A is not explained. Since the development of the telescope by Galileo in the early 1600s, there has been no supernova inside the Milky Way. SN 1987A has been the closest, so it has been photographed repeatedly in multiple wavelengths to track the evolution of the explosion’s ejecta. Webb now gives us a better look in the infrared, though in truth the small amount of new details is actually somewhat disappointing.

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Firefly notifies Space Force that it is ready to launch military payload at a moment’s notice

9:39 am

As part of a military program to improve the speed of launching payloads, Firefly and its payload provider Millennium have now notified the Space Force that both are ready to launch a satellite any time in the next six months, and do so fast.

Although this mission has been promoted as a 24-hour call-up, it is being planned in multiple stages and the companies have spent months rehearsing and preparing. The intent of the demonstration is to help the Space Force and the space industry contractors figure out processes to accelerate the planning and execution of national security missions.

Firefly and Millennium are now officially in a six-month “hot standby phase.” At any point during that time the Space Force will give the companies an alert notification, kicking off a 60-hour window to transport the payload to Firefly’s launch site at Vandenberg Space Force Base, California. conduct fueling operations and integrate it with the Alpha rocket’s payload adapter.

Space Force officials will then issue Firefly a launch notice with the final orbit requirements. Firefly will then have 24 hours to update the trajectory and guidance software, encapsulate the payload, transport it to the pad, mate to Alpha, and stand ready to launch at the first available window.

It appears that SpaceX has already done a similar thing with a fast classified launch several years ago, announcing the contract award and launching a classified payload within weeks. This new test is likely to show Firefly’s ability to do the same.

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Vikram takes movie of Pragyan rover as it roves

9:30 am

Pragyan as seen by Vikram
Click for movie.

Using one of Vikram’s lander cameras, engineers have produced a short movie of India’s Pragyan rover as it rotated to avoid a small crater about ten feet ahead.

The picture to the right is from that 16-second movie, near its end. It appears that the engineers operating Pragyan were unhappy with almost any route ahead from its present position, as they rotated Pragyan almost 360 degrees, and even attempted forward motion at one point and then resumed rotation.

It is not clear if any of the craters visible in this picture are the crater that caused the detour. The movie however does provide a sense of scale. Pragyan is small, but it is able to maneuver easily using its six wheels.

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Soviet satellite from 1991 breaks up

9:14 am

Ground observations have detected the break up of a Soviet satellite launched in 1991, resulting in at least seven pieces of debris.

Another possible orbital impact event: 7 debris objects cataloged from a defunct Soviet communications satellite launched in 1991. Debris appears to be from either Kosmos-2143 or Kosmos-2145, two of 8 Strela-1M sats launched on the same rocket.

Though the report speculates the break-up was caused by an impact, that is not certain. Moreover, though this increases the amount of space junk, don’t be triggered by reports of disaster. The pieces are likely all flying in about the same orbit close together, which means they do not increase the actual danger from them by much. That orbit has caused no issues from this satellite for more than three decades.

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China’s Long March 2D launches 3 satellites

8:55 am

China today successfully placed three “remote sensing” satellites into orbit, using its Long March 2D rocket lifting off from its Xichang spaceport in south China.

The state-run press provided no other information, including whether the rocket’s lower stages crashed near habitable areas. According to the flight path, the crash zones were near major population centers, including one city with a population of nine million.

SpaceX meanwhile scrubbed a Falcon 9 launch this morning at Vandenberg due to an issue with one first stage engine, but it is still scheduled to launch 22 Starlink satellites this afternoon from Cape Canaveral. The live stream is here.

The leaders in the 2023 launch race:

59 SpaceX
38 China
12 Russia
7 Rocket Lab

In the national rankings, American private enterprise still leads China in successful launches 68 to 38. It also leads the entire world combined, 68 to 61, while SpaceX by itself now trails the rest of the world (excluding American companies) 59 to 61 in successful launches.

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August 30, 2023 Quick space links

3:46 pm

Courtesy of BtB’s stringer Jay.

 

 

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The utter ignorance of modern educators on proud display the last two days in Colorado

3:32 pm

Jaiden and school official
Click to watch the video

In the last few days a story about a 12-year-old boy who was banned from classes because he had a Gadsden flag sticker on his backpack has gone viral, with the school, The Vanguard School, forced to cancel its parents night because of the outrage.

School officials had claimed that the Gadsden flag was not allowed at the school because it had “its origins in slavery and the slave trade,” a false statement of such utter ignorance of American history it leaves anyone with any education breathless with astonishment. The picture to the right shows the student Jaiden reacting in bemused disbelief at the moment that school official (in the background) made this absurd claim. He clearly knows more about American history than this brainless school official.

Not surprisingly, the uproar quickly caused the school’s board of directors to call an emergency meeting in which they backed down, especially as Jaiden had said he intended to continue to come to classes with the sticker on his pack, and would even do a sit-in if they dared try to kick him out again.

My purpose in mentioning this story however is to show how it illustrates so completely the bankruptcy of our education system today. Educators simply do not know American history, even though they are the people we expect to teach it. And when that ignorance is discovered, as in this case, they can’t just admit error and apologize, they have to equivocate and add more lies to their foolishness.
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Reviewing a book blacklisted by Amazon because it dared say things Amazon doesn’t like

1:35 pm

The Plague of Models, blacklisted by Amazon
The Plague of Models, blacklisted by Amazon

They’re coming for you next: Last week I posted an essay on the over-use and misuse of computer modeling in today’s scientific community, focused specifically on the unreliability of all climate models to successfully predict any actual climate trends.

One of the individuals who read my essay, Kenneth Green, immediately commented here on Behind the Black to note that he had just published a book on this very subject, entitled The Plague of Models: How Computer Modeling Corrupted Environmental, Health, and Safety Regulations, describing how the misuse of models has resulted in the proliferation of government regulations based not on actual data but on computer models that in many ways are nothing more than the opinions of the computer programs.

Green also noted that Amazon has refused to make his book available for sale, essentially banning it for no justifiable reason. As he explained to me in an email,

My publisher, who is a start-up small Canadian publisher specializing in public policy books, tried to upload The Plague of Models to Amazon, as he had previously done with half a dozen other books while working at previous institutions as in-house publisher.

This time, unlike his previous experiences, the book was taken down shortly after it was uploaded (and we know the upload process worked, since the book was available briefly for preview, so there was no technical issue with the manuscript file). The publisher got a form-letter email saying that the book had been taken down because it may have violated some (non-specific) Amazon Term of Service. When he sent a note back requesting clarification/appeal, he got another form letter, this one repeating that the book may have violated some term of service, and warning that any attempt to re-upload would get his entire account terminated.
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Buried ridges at the bottom of a Martian abyss

11:03 am

Buried ridges in a Martian abyss
Click for full image.

Today’s cool image could be labeled a “What the heck?!” photo, as the origin of its most distinct feature is utterly baffling. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 18, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows what look like a collection of meandering ridges peeking out from a terrain covered by thick dust.

The scientists label this dust-covered ground, as well as the ripple dunes to the south in the full image, “sand sheets.” Without question, the ground here seems to resemble a Sahara-like terrain. It is utterly featureless, other than the few bedrock features that poke up out of that sand. In the full image some peaks stick out, but it the meandering ridges in this section that are most intriguing. They are reminiscent of rimstone dams in caves, but what formed them remains baffling, since cave rimstone dams are formed by the interaction of limestone and water, and there is absolutely no evidence of any near surface ice at this location in the dry equatorial regions of Mars.

All the ridges signify is a buried terrain formed in some inexplicable way.
» Read more

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Scientists believe they have recovered the first known interstellar meteorite

8:52 am

A scientific expedition in the Pacific off the coast of Papua New Guinea has found what it thinks are spherules from the first known interstellar meteorite that hit the Earth on January 8, 2014 and dubbed IM1. From their preprint paper [pdf]:

On 8 January 2014 US government satellite sensors detected three atmospheric detonations in rapid succession about 84 km north of Manus Island, outside the territorial waters of Papua New Guinea (20 km). Analysis of the trajectory suggested an interstellar origin of the causative object CNEOS 2014-01-08: an arrival velocity relative to Earth in excess of ∼ 45 km s−1, and a vector tracked back to outside the plane of the ecliptic. The object’s speed relative to the Local Standard of Rest of the Milky-Way galaxy, ∼ 60 km s−1, was higher than 95% of the stars in the Sun’s vicinity.

In 2022 the US Space Command issued a formal letter to NASA certifying a 99.999% likelihood that the object was interstellar in origin.

Using a “magnetic sled” that they dragged across the seafloor, the scientists collected about 700 spherules thought to come from the meteorite, of which 57 have been analyzed and found to have properties that confirm their interstellar origin. As they note in their paper, “The spherules with enrichment of beryllium (Be), lanthanum (La) and uranium (U), labeled “BeLaU”, appear to have an exotic composition different from other solar system materials.”

The “BeLaU” elemental abundance pattern does not match terrestrial alloys, fallout from nuclear explosions, magma ocean abundances of Earth, its Moon or Mars or other natural meteorites in the solar system. This supports the interstellar origin of IM1 independently of the measurement of its high speed, as reported in the CNEOS catalog and confirmed by the US Space Command.

Based on the sparse data, the scientists speculate that these spherules could have come from the crust of an exoplanet, the core collapse of a supernova, the merger of two neutron stars, and even possibly “an extraterrestrial technological origin.” They have no idea, but all these are among the possibilities.

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Starlink makes deal with Japanese cell phone company

8:33 am

SpaceX has now partnered with the Japanese cell phone company KDDI to provide satellite-to-cellular service in remote areas of Japan that do not have good cell tower service.

The companies plan to start with SMS text services as early as 2024 and will eventually provide voice and data services. Almost all existing smartphones on KDDI network will be compatible with this new service as it employs the device’s existing radio services.

Since Starlink now has more than 5,000 satellites in orbit, it can offer its services to a wider ranger of customers worldwide, and has been slowly signing them up, from country to country.

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Pragyan snaps first pictures of Vikram sitting on the Moon

8:28 am

Vikram as seen by Pragyan
Click for original image.

India’s space agency ISRO has released the first two pictures from the Pragyan rover showing the Vikram lander that bought both to the Moon safely.

The picture to the right is the close-up image, which shows two of Vikram’s science instruments. CHASTE is a probe that has been measuring the temperature of the Moon’s regolith at this spot, while ILSA is a seismometer for measuring the seismicity around the landing site.

Both spacecraft have been on the lunar surface now for one week, which means they are both halfway through their nominal two-week mission that lasts until lunar sunset, occurring on September 4th. Neither were designed to survive the 14-day-long lunar night, though engineers will attempt to kept both alive.

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August 29, 2023 Quick space links

3:38 pm

Courtesy of BtB’s stringer Jay.

 

 

 

 

 

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Pushback: Court rules against East Lansing’s attempt to blacklist Christian for following his beliefs

1:38 pm

Country Mills Farms-banned!
The Tennes are a normal family! We must blacklist them!

They’re coming for you next: Today’s blacklist story is a follow-up on a August 2021 post, and is a victory, of a sort. As I reported then, after farmer Steve Tennes (shown to the right with his family) made the egregious error of stating his strongly held Christian belief that marriage is for a man and a woman only, and he would only rent his farm for such marriages, and not same-sex marriages, the city government of East Lansing decided to specifically write rules that would ban his farm from participating in its local farmer’s market.

The ban against their business, Country Mill Farms, was begun in 2016. Though a court quickly ruled that it was unconstitutional, the city renewed the ban in 2018 and has maintained it since, claiming the court’s ruling only applied to the 2017 season.

The logic of the East Lansing government is actually quite blatent: It believes it has the right to dictate what others can or cannot say in public, the first amendment be damned.

The city’s new rules quite clearly stated it was illegal for anyone to “make a statement which indicates that an individual’s patronage or presence at a place of public accommodation is unwelcome or unacceptable because of sexual orientation, gender identity, or expression.” You essentially had to agree to its queer agenda policies in all things, even if you were not in East Lansing or were doing business in a farm many miles away. And you better not express any dissent to those policies either!
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Update on the ongoing research of the closest supernovae in a decade

12:47 pm

Gemini North image of supernova in Pinwheel Galaxy
Click for original image, taken by the Gemini North telescope in Hawaii.

Link here. Though the press release from UC-Berkeley focuses mostly of research being done by its astronomers, it also provides a very good overview of what all astronomers worldwide have been learning since Supernova SN 2023ixf was first discovered by amateur astronomer Koichi Itagaki in Japan on May 19, 2023 in the Pinwheel Galaxy, only 20 million light years away. This tidbit is probably the most significant:

Another group of astronomers led by Ryan Chornock, a UC Berkeley adjunct associate professor of astronomy, gathered spectroscopic data using the same telescope at Lick Observatory. Graduate student Wynn Jacobson-Galán and professor Raffaella Margutti analyzed the data to reconstruct the pre- and post-explosion history of the star, and found evidence that it had shed gas for the previous three to six years before collapsing and exploding. The amount of gas shed or ejected before the explosion could have been 5% of its total mass — enough to create a dense cloud of material through which the supernova ejecta had to plow.

Such data is going to help astronomers better predict when a star is about to go boom, by identifying similar behavior.

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The prevailing winds in Mars’ volcano country

12:35 pm

The prevailing winds in Mars' volcano country
Click for original image.

Today’s cool image is actual one new picture and four past images, which taken together reveal something about the larger wind patterns on Mars. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 27, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) and shows a tiny wind-swept section of the giant volcanic ash field dubbed the Medusae Fossae Formation, about the size of the subcontinent of India and thought to be source of most of the dust on Mars.

The innumerable parallel thin ridges here all suggest that the prevailing winds blow from the southeast to the northwest. As they blow, the scour the surface ash out, and sometimes reveal the underlying bedrock, which here shows up as those small peaks and a handful of northeast-to-southwest trending larger ridges. Note too that the picture shown is only a small section of the full image, which shows that this landscape continues for a considerable distance in all directions.
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