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NASA is in the business of launching things into orbit. But what goes up must come down, and if whatever is coming down doesn’t burn up in the atmosphere, it will strike Earth somewhere.

Even Florida isn’t safe.

Careful consideration goes into releasing debris from the International Space Station. Its mass is measured and calculated so that it burns up during re-entry to Earth’s atmosphere. But in March 2024, something didn’t go as planned.

It all started in 2021 when astronauts replaced the ISS’s nickel hydride batteries with lithium-ion batteries. It was part of a power system upgrade, and the expired batteries added up to about 2,630 kg (5,800 lbs.) On March 8th, 2021, ground controllers used the ISS’s robotic arm to release a pallet full of the expired batteries into space, where orbital decay would eventually send them plummeting into Earth’s atmosphere.

The Canadarm 2 robotic arm releases a pallet of spent batteries into space on March 8th, 2021. Image Credit: NASA

It was the most massive debris release from the ISS. According to calculations, it should have burned up when it entered the atmosphere on March 8th, 2024. But it didn’t.

Alejandro Otero owns a home in Naples, Florida. He wasn’t home on March 8th when there was a loud crash as something smashed into his roof. But his son was. “It was a tremendous sound. It almost hit my son,” Otero told CNN affiliate WINK News in March. “He was two rooms over and heard it all.”

“Something ripped through the house and then made a big hole in the floor and on the ceiling,” Otero explained. “I’m super grateful that nobody got hurt.”

This time, nobody got hurt. But NASA is taking the accident seriously.

Otero cooperated with NASA, and NASA examined the object at the Kennedy Space Center in Florida. They determined the debris was from a stanchion used to mount the old batteries on a special cargo pallet.

This image shows an intact stanchion and the recovered stanchion from the NASA flight support equipment used to mount International Space Station batteries on a cargo pallet. The stanchion survived re-entry through Earth’s atmosphere on March 8, 2024, and impacted a home in Naples, Florida. Image Credit: NASA

The stanchion is made of the superalloy Inconel to understand extreme environments, including extreme heat. It weighs 725 grams (1.6 lbs.) It’s about 10 cm (4 inches) in height and 4 cm (1.6 inches) in diameter.

Even though it’s a tiny object, it’s the type of accident that NASA and the ISS are determined to avoid. “The International Space Station will perform a detailed investigation of the jettison and re-entry analysis to determine the cause of the debris survival and to update modelling and analysis, as needed,” a NASA statement read.

Investigators want to know how the debris survived without burning up on re-entry. Engineers use models to understand how objects react to re-entry heat and break apart, and this event will refine those models. In fact, every time an object reaches the ground, the models are updated.

For Otero, this accident amounted to little more than a great story and an insurance claim. But the chunk of stanchion could’ve seriously injured someone or even killed someone.

In January 1997, Lottie Williams was walking through a park with friends in Tulsa, Oklahoma, in the early morning. They saw a huge fireball in the sky and felt a rush of excitement, thinking they were seeing a shooting star. “We were stunned, in awe,” Williams told FoxNews.com. “It was beautiful.”

Then, something struck her lightly on the shoulder before falling to the ground. It was like a piece of metallic fabric, and after reaching out to some authorities, she learned that it was part of a fuel tank from a Delta II rocket. She’s the first person known to have been hit with space debris. Had it been something with more mass, who knows if Williams would’ve been injured or worse?

That’s why NASA takes debris survival so seriously. The guilt of injuring or even killing someone would be overwhelming. A serious debris accident could also make things very uncomfortable going forward, as people can be fickle and not prone to critical thinking. NASA’s already struggling with budget constraints; the organization doesn’t need any nasty public relations to imperil its progress further.

Complicating matters is that the ESA warned that not all the battery debris would burn up. There wasn’t much else they could do. Fluctuating atmospheric drag made it impossible to predict where debris would strike Earth.

Those who follow space know how complicated and unpredictable this is. And they likewise know how improbable an injury is. But there’s always a non-zero chance of injury or death from space debris for someone going about their life here on the Earth’s surface. If that ever happened, the scrutiny would be intense.

Is it statistical fear-mongering to consider space debris striking someone, injuring them, or worse? Probably. When we see a shooting star in the sky, it’s safe to enjoy the spectacle without worry.

But maybe, just in case, out of an abundance of caution, Don’t Look Up.

The post NASA Confirms that a Piece of its Battery Pack Smashed into a Florida Home appeared first on Universe Today.

I used to think that the “decolonization” of STEM was strongest in New Zealand and South Africa, which of course is a movement to dethrone so-called “Western” science in favor of indigenous science. But now I’m beginning to wonder if the “indigenization/decolonization of science” isn’t making its way deep into Australia as well.  I have followed developments in New Zealand far more closely than these other places, because I hear often from Kiwi scientists who beef about the dethroning of modern science (which hasn’t been “Western” in a while) in favor of Mātauranga Māori (MM), the “way of knowing” of the indigenous Māori people. Also, I have visited New Zealand, love the place, and would be devastated if science were watered down with superstition, myth, legend, and morality.

And that’s the first issue with “decolonizing” science. Usually those movements intend to either defenestrate modern science or at least teach “indigenous science” alongside it as an equally valid “way of knowing”. Yet indigenous science, like MM, is a grab-bag of empirical knowledge based on trial and error (the premier example is the navigation of Polynesians, the ancestors of Māori; another is how to catch eels), but is also imbued with superstitions, myths, legends, word-of-mouth tales, and “rules for living”, including morality. And rarely is indigenous science vetted with the same rigor as is modern science, because modern science has many features missing in indigenous “ways of knowing” (double-blind testing, deliberate replication, hypothesis testing, and so on).  One result is that “indigenous science” can be wrong more often. One example is the insistence of some New Zealand researchers that Polynesians discovered Antarctica in the early seventh century. This is based on oral legend combined with mistranslation; in fact, the Russians were the first to glimpse the continent—in 1820.

Now trial and error methods can indeed produce empirical knowledge in the sense of “justified true belief”, but that is practical knowledge, designed to help people where to find things to eat, how to navigate, how to herd bison, when to plant food, and the like. Its ambit is far narrower than that of modern science, and examples of “indigenous science” that have made valuable contributions to modern science are thin on the ground.

Which brings us to the second issue with indigenous science. Although it’s touted loudly and passionately, examples of indigenous knowledge making substantial contributions to modern science are either scant or missing. Most of the written defenses of enthroning indigenous science I’ve seen are based on a need to pay attention to marginalized people as oppressed victims, whose knowledge must be elevated precisely because they were victims.  But that’s no way to judge science.

And that is precisely the content of this puff piec, coming from Australian National University (ANU) in Canberra, touting the dethroning of “mainstream European-based mathematics” in favor of mathematics produced and used by “Indigenous and First Nations peoples around the world.” The article highlights Professor Rowena Ball of ANU’s College of Science, who lists these as her research interests:

Mathematics Without Borders, Truth-Telling in Mathematics History, Decolonisation of STEM, Indigenous and Non-Western Mathematics, Emergence of life, Nonlinear and complex dynamical systems, Thermochemical instabilities and oscillators, Thermodynamic analysis, Railways and trains, Country pub lunches

What is mathematics? What is included in mathematics? Who gets to say? How and why did Western mathematics exclusively colonise minds and curriculums over the whole world? Should that situation continue unabated?

It will not escape your notice if you read the piece, heavy with quotes from Dr. Ball, that she neglects the contributions of anything other than “mainstream European-based mathematics” to modern mathematics, leaving out the contributions of the Egyptians, Greeks, Arabs, Romans, and Babylonians to modern mathematics. Those people were apparently not “indigenous” and at any rate were not “colonized”. But Ball goes on and on, proffering only one tepid example of how a group of Australian aboriginals in Mithaka Country (an area of east-central Australia) had a form of mathematics that was useful. It turns out that it wasn’t mathematics at all, but practical knowledge that we wouldn’t recognize today as “math” at all.

Click the screenshot to read this short piece (h/t Peter Forsythe):

First I’ll give some of her quotes from the ANU piece (indented) and then her holotype specimen of indigenous math.

What constitutes mathematical knowledge? What is included in mathematics? Who gets to decide? These are some of the questions being asked in a growing decolonisation movement.

“Mathematics is a universal human phenomenon, and students of under-represented and minority groups and colonised peoples are starting to be more critical about accepting unquestioningly the cultural hegemony of mainstream European-based mathematics,” says Professor Rowena Ball from the ANU Mathematical Sciences Institute.

Professor Ball leads a research and teaching initiative called Mathematics Without Borders, aimed at broadening and diversifying the cultural base and content of mathematics.

“Mathematics has been gatekept by the West and defined to exclude entire cultures. Almost all mathematics that students have ever come across is European-based,” she explains. “We would like to enrich the discipline through the inclusion of cross-cultural mathematics.”

“Indigenous and First Nations peoples around the world are standing up and saying: ‘Our knowledge is just as good as anybody else’s − why can’t we teach it to our children in our schools, and in our own way?’

“And this is happening in New Zealand, North and South America, and Africa, and also in a great movement in India to revive traditional Indian mathematics.”

But wait!  There’s more:

. . .“There is a lot of gatekeeping going on,” Professor Ball says of having to justify Indigenous maths. “One effect of colonisation of the curriculum is defensive protection of what is thought to be an exclusively European and British provenance of mathematics.”

“Like most mathematicians I was educated in European and British mathematics,” says Professor Ball, “and it’s fine stuff – I still love my original research field in dynamical systems.” But that mathematics did not develop in isolation, she says, and now there’s even more to learn about how non-Western societies have been seeing the world mathematically that many of us haven’t yet tuned into.

“What the general public think of as mathematics tends to be whatever they learned (or, more likely, did not learn) at school. But in many Indigenous societies, mathematics is lived from when you are born to when you rejoin your ancestors,” Professor Ball says.

Rejoin your ancestors? Does she mean as underground worm food? I don’t think so. But I digress.  Ball argues that indigenous math is largely non-numerical, though in her one unpublished paper that is mentioned in the article (see below), numbers and counting figure largely.

At any rate, here is the single example Ball gives of valuable indigenous mathematics. I am not making this up: it involves the direction of smoke signals.

“One interesting example that we are currently investigating is the use of chiral symmetry to engineer a long-distance smoke signalling technology in real time,” Professor Ball says. “If you light an incense stick you will see the twin counter-rotating vortices that emanate − these are a chiral pair, meaning they are non-superimposable mirror images of each other.”

A memoir by Alice Duncan Kemp, who grew up on a cattle station on Mithaka country in the early 1900s, vividly describes the signalling procedure, in which husband-and-wife expert team Bogie and Mary-Anne selected and pulsed the smoke waves with a left to right curl, to signal “white men”, instead of the more usual right to left spiral.

Mithaka country is southwest Queensland − Kurrawoolben and Kirrenderri (Diamantina) and Nooroondinna (Georgina) river channel country − and for thousands of years this region was a rich, well-populated cultural and trade crossroads of the Australian continent.

To create and understand these signals, you have to be a skilled practical mathematician, Professor Ball says.

“Theory and mathematics in Mithaka society were systematised and taught intergenerationally. You don’t just somehow pop up and suddenly start a chiral signalling technology. It has been taught and developed and practised by many people through the generations.”

At that time in the early twentieth century, British meteorologists were just beginning to understand the essential vortical nature of atmospheric flows.

“Imagine if the existing Indigenous Mithaka knowledge of vorticity had been recognised, nurtured and protected? In what ways may it have fed into the high performance, numerical weather forecasting capabilities that we all rely on now?” she asks.

I don’t find this at all convincing. First, Bogie and Mary-Anne sound like white oppressors to me. But even if they weren’t, is the “reverse curl” something the locals actually used to signal “white people around”? It couldn’t have been going on for thousands of years because the first European people arrived in Australia in the early 17th century. So was there an elaborate system of smoke signals before that? Perhaps, but how are they based on mathematics? Patterns of smoke, like drumbeats, is a kind of language, and how to make the patterns and get them understood correctly is based on trial and error. Where does the math come in?

Further, the claim that the Mithaka knowledge of vorticity—I’m not sure what that knowledge is beyond empirical ways to make smoke signals—would have revolutionized “high performance numerical weather forecasting” long before now is simply risible.

Well, that’s enough. But I’d be remiss not to at least mention a paper by Xu and Ball that defends the thesis above. It’s called “Is the study of Indigenous mathematics ill-directed or beneficial?“, and appears at Arχiv.org, which means it hasn’t been published or peer-reviewed. There are a few examples of indigenous mathematics, which I put below. In some cases you’ll have to look up the references given to check on which people they’re referring to:

Much of ordinary day-to-day arithmetic and geometry performed by ‘illiterate’ women, artisans, carpenters and many other workers are unwritten and even unspoken (Wood, 2000). The apprentice learns by watching carefully then doing the mathematics themselves. The use of tools–an unwritten approach–to support arithmetic has a long history; there are different media for recording and computing with numbers, including stones, twigs, knots and notches (Hansson, 2018). People of many Indigenous Pacific and Australian nations can use parts of the body to count quickly and accurately (Goetzfridt, 2007; Owens & Lean, 2018; Wood, 2000), communicating methods, operations and results through speaking, listening and gesture. Weaving skills were taught unwritten to next generations to construct the numerical relationships that give rise to the desired complex geometrical designs with symmetries (Hansson, 2018). Knotted quipus were used by ‘illiterate’ Inca people of South American
Andes regions to allot land and levy taxes (Ascher & Ascher, 2013). The quipu (Figure 1), with its columns of base-10 numerical data encoded as knots, can be thought of as a spreadsheet, and it seems likely that the Inca knew and applied some array and matrix operations.

Dan, an Indigenous language of central Liberia, is non-written but Dan speakers can carry out arithmetic operations orally, including addition, subtraction and division, play games that require fast counting, tracking and calculating skills, and practice geometric principles in constructing buildings (Sternstein, 2008). Fractal geometry, developed to a high art in Western mathematics from the late 1960s and executed in silico, has non-Western antecedents that were implemented in the built environment in Africa (Eglash, 1998). Chaology and fractal geometry have also been a part of traditional Chinese architectural and garden design for thousands of years (Li & Liao, 1998).

Clearly some indigenous people could count and calculate, though the calculating seems to fall largely to the Chinese, not usually considered indigenous. At any rate, what’s above doesn’t jibe with the claim and quote in the article:

Numbers and arithmetic and accounting often are of secondary importance in Indigenous mathematics.

“In fact, as most mathematicians know, mathematics is primarily the science of patterns and periodicities and symmetries − and recognising and classifying those patterns.”

A lot of the above sounds like counting and accounting to me.  Regardless, it’s clear that some indigenous people could count and figure out patterns that involved counting.  I’m not so sure about the Inca “matrix” operations,  but one can hardly carry out some kind of commerce or taxation without being able to count. At any rate, yes, indigenous people had a form of “counting and pattern mathematics,” but to put them on a par even with what the ancient Egyptians and Greeks accomplished mathematically is to give indigenous people too much credit.

The vertebrae of Vasuki indicus, a snake that lived 47 million years ago, suggest it could have been as long as 15 metres

A geo-environmental scientist from Japan has composed a string quartet using sonified climate data. The 6-minute-long composition -- entitled 'String Quartet No. 1 'Polar Energy Budget'-- is based on over 30 years of satellite-collected climate data from the Arctic and Antarctic and aims to garner attention on how climate is driven by the input and output of energy at the poles.

Most cancer patients do not benefit from early targeted therapies. Scientists now describe a new computational pipeline to systematically predict patient response to cancer drugs at single-cell resolution.

Companies can't simply walk away from old oil and gas wells. They have to be capped in a way that protects the environment and prevents leaks. A new approach to today's solution could be better for the environment and cheaper, too.

Monitoring and treating a case of multiple sclerosis requires reliable and long-term data on how the disease is progressing in the person in question. Fitness trackers and smartphones can supply this data, as a research team has now shown.

Monitoring and treating a case of multiple sclerosis requires reliable and long-term data on how the disease is progressing in the person in question. Fitness trackers and smartphones can supply this data, as a research team has now shown.

Researchers are targeting the next generation of soft actuators and robots with an elastomer-based ink for 3D printing objects with locally changing mechanical properties, eliminating the need for cumbersome mechanical joints.

Researchers are targeting the next generation of soft actuators and robots with an elastomer-based ink for 3D printing objects with locally changing mechanical properties, eliminating the need for cumbersome mechanical joints.

The final version of the Cass Review (formally the “Independent Review of Gender Identity Services for Children and Young People”) was issued on April 10. Here’s a brief summary by the CBC, noting that doctors and others have griped about it:

A long-anticipated — and contentious — national review of gender-affirming care for youth in England was released last week, resulting in headlines across the U.K. saying that gender medicine is “built on shaky foundations.”

The Cass Review, chaired by pediatrician Hilary Cass, was commissioned by England’s National Health Service (NHS) in 2020.

Even before the final report was published, the review has led to significant changes for youth gender medicine in England, where the debate over transgender care has become increasingly heated, with complaints of both long waiting lists and medical treatments being too readily available to youth.

Last month, the Cass Review findings led to a ban on the prescription of puberty-suppressing hormones except for youth enrolled in clinical research.

That’s a move away from the standard of care supported by many international medical bodies, including the Canadian Pediatric Society (CPS), the American Academy of Pediatrics and World Professional Association for Transgender Health. Though several European countries including Sweden have also restricted access to puberty blockers and other medical treatments for youth.

The report cites a systematic review of evidence, commissioned as part of the Cass Review, which found “a lack of high-quality research” that puberty blockers can help young people with gender dysphoria.

While experts in the field say more studies should be done, Canadian doctors who spoke to CBC News disagree with the finding that there isn’t enough evidence puberty blockers can help.

I had no time to read the long report, and didn’t think that just regurgitating a summary for the readers was sufficient. But reader Jez told me he was going through it, and I asked him if he wouldn’t mind writing his take for this site. He kindly agreed, and so, without further ado. . . .

First, though, Jez notes

“The Cass Review’s final report (and its other publications) are available here.

 

THE CASS REVIEW: A READER’S TAKE

by Jez Grove

Since around 2014, the number of children and young people presenting at gender clinics in the Western world has surged and the patient profile has switched dramatically from predominantly pre-pubertal males to teenage females. Both changes are unexplained. The treatment offered to these patients has also significantly shifted: a psychosocial and psychotherapeutic approach has given way to many being offered medical treatment with puberty blockers (gonadotropin-releasing hormone analogues, GnRH) and cross-sex hormones.

In September 2020, Dr Hilary Cass, a retired consultant paediatrician and former President of the Royal College of Paediatrics and Child Health, was appointed to undertake a full review into how NHS England* “should most appropriately assess, diagnose and care for children and young people who present with gender incongruence and gender identity issues [and] to make recommendations on how to improve services […] and ensure that the best model/s for safe and effective services are commissioned”. [Cass Review Final Report, henceforeth “CRFR”, Appendix 1: Terms of Reference]

The Cass Review’s Interim Report (2022) highlighted that a lack of evidence on the medium- and long-term outcomes of the treatments that children and young people were receiving was limiting the advice that the Review could give. In response, it commissioned an independent research programme to provide “the best available collation of published evidence, as well as qualitative and quantitative research to fill knowledge gaps” and set up a Clinical Expert Group to help it interpret the findings. [CRFR, p. 25]

The Interim Review also warned that social transitioning (changing, name, appearance and pronouns, etc.):

. . . .“may not be thought of as an intervention or treatment, because it is not something that happens within health services. However, it is important to view it as an active intervention because it may have significant effects on the child or young person in terms of their psychological functioning. There are different views on the benefits versus the harms of early social transition. Whatever position one takes, it is important to acknowledge that it is not a neutral act, and better information is needed about outcomes”. [Cass Review Interim Report, henceforth”CRIR”; pp 62-63]

The findings of the Interim Report led to the closure of the Gender Identity Development Service (GIDS) last month.

Last week, the Cass Review published its Final Report. Dr Cass begins it with an apparent effort to placate her critics; her opening sentences read:

“This Review is not about defining what it means to be trans, nor is it about undermining the validity of trans identities, challenging the right of people to express themselves, or rolling back on people’s rights to healthcare. It is about what the healthcare approach should be, and how best to help the growing number of children and young people who are looking for support from the NHS in relation to their gender identity”. [CRFR, Foreword from the Chair, p. 12]

However, she is not blind to the problems that have developed in this area of healthcare:

“It often takes many years before strongly positive research findings are incorporated into practice. There are many reasons for this. One is that doctors can be cautious in implementing new findings, particularly when their own clinical experience is telling them the current approach they have used over many years is the right one for their patients. Quite the reverse happened in the field of gender care for children. Based on a single Dutch study, which suggested that puberty blockers may improve psychological wellbeing for a narrowly defined group of children with gender incongruence, the practice spread at pace to other countries. This was closely followed by a greater readiness to start masculinising/feminising hormones in mid-teens, and the extension of this approach to a wider group of adolescents who would not have met the inclusion criteria for the original Dutch study. Some practitioners abandoned normal clinical approaches to holistic assessment, which has meant that this group of young people have been exceptionalised compared to other young people with similarly complex presentations. They deserve very much better”. [CRFR, Foreword from the Chair, pp. 13-14]

The problems with the evidence base that sparked the Review persist, with Cass writing that the independent research programme she had commissioned

. . . .“has shown that there continues to be a lack of high-quality evidence in this area and disappointingly […], attempts to improve the evidence base have been thwarted by a lack of cooperation from the adult gender services.  The Review has therefore had to base its recommendations on the currently available evidence, supplemented by its own extensive programme of engagement”. [CRFR, p. 20]

The failure of the UK’s adult gender services to cooperate is perhaps the most shocking revelation in the report. As Cass notes,

“When clinicians talk to patients about what interventions may be best for them, they usually refer to the longer-term benefits and risks of different options, based on outcome data from other people who have been through a similar care pathway. This information is not currently available for interventions in children and young people with gender incongruence or gender dysphoria, so young people and their families have to make decisions without an adequate picture of the potential impacts and outcomes”. [CRFR, p. 33]

A quantitative data linkage study was intended to

. . . “use existing data held by the NHS, including data from GIDS, hospital wards, outpatient clinics, emergency departments and NHS adult GDCs, to track the journeys of all young people (approximately 9,000) referred to the GIDS service through the system to provide a population-level evidence base of the different pathways people take and the outcomes. This type of research is usual practice in the NHS when looking to improve health services and care received.  However, this has not been the case for gender-questioning children and young people and the hope was that this data linkage would go some way to redress this imbalance”. [Cass Review Final Report, p. 190]

Despite its “not particularly unusual” methodology, it took more than a year for the study to receive ethics approval from the Health Research Authority (HRA); Cass considers the “robust scrutiny and consideration [to be] entirely appropriate given the sensitivity of the subject matter”. [Ibid.] The independent research team “undertook stakeholder engagement and developed the patient notifications and communications resources to explain the research and provide information about how to opt-out of the study should an individual choose to do so. […] In January 2024, the Review received a letter from NHS England stating that, despite efforts to encourage the participation of the NHS gender clinics, the necessary co-operation had not been forthcoming”. [Ibid.] Appendix 4 of the Review sets out the details and history of the “thwarted” study.

The proposed linkage study had been complicated by the fact that, uniquely, GIDS patients are issued new National Health Service (NHS) numbers when registering their new gender identity. Cass notes:

“From a research perspective, the issuing of new NHS numbers makes it more difficult to identify the long-term outcomes for a patient population for whom the evidence base is weak”. [CRFR, p. 229]

The UK government had to bring forward a special legislative instrument to facilitate linking the patients’ new and old NHS records; NHS England had vowed to pursue the thwarted research before the special instrument’s powers expire in 2027.

There are other serious unintended consequences of allowing young patients to change their NHS numbers. Cass writes,

“Safeguarding professionals have described a range of situations where this has put children/young people at risk. These include young people attending hospital after self-harm not being identifiable as a child already on a child protection order; records of previous trauma and/or physical ill health being lost; people who do not have parental responsibility changing a child’s name and gender; children being re-registered as the opposite gender in infancy; children on the child protection register being untraceable after moving to a new area”. [CRFR, p. 229]

While Cass has been unable to use a stronger evidence base, she has provided a valuable service in bringing together an independent and thorough assessment of the existing research in areas related to the assessment, diagnosis, and treatment of gender-confused children and young people and suggested a way forward.

The Review gives:

• An overview of the patient profile, including mental health and neurodiversity, adverse childhood experiences, theories about the rise in referrals and the change in case mix, and the weak evidence with regard to suicidality.
• An important appraisal and synthesis of the available international guidelines. Cass notes,

“For many of the guidelines it was difficult to detect what evidence had been reviewed and how this informed development of the recommendations. For example, most of the guidelines described insufficient evidence about the risks and benefits of medical treatment in adolescents, particularly in relation to long-term outcomes. Despite this, many then went on to cite this same evidence to recommend medical treatments.

Alternatively, they referred to other guidelines that recommend medical treatments as their basis for making the same recommendations. Early versions of two international guidelines, the Endocrine Society 2009 and World Professional Association for Transgender Healthcare (WPATH) 7 guidelines influenced nearly all the other guidelines. These two guidelines are also closely interlinked, with WPATH adopting Endocrine Society recommendations, and acting as a co-sponsor and providing input to drafts of the Endocrine Society guideline. WPATH 8 cited many of the other national and regional guidelines to support some of its recommendations, despite these guidelines having been considerably influenced by WPATH 7. The links between the various guidelines are demonstrated in the graphics in the guideline appraisal paper (Hewitt et al., Guidelines 1: Appraisal).

The circularity of this approach may explain why there has been an apparent consensus on key areas of practice despite the evidence being poor.” [Cass Review Final Report, p. 130]

• An overview of the existing clinical approach and clinical management and recommendations to improve them.
• Recommendations for a new service model for NHS England, including follow-through services for 17-25 years-olds to ensure continuity at “a potentially vulnerable stage in their journey” and “allow clinical and research follow-up data to be collected”. [CRFR, p. 225] She also stresses the needs for detransitioners to be supported and warns of the dangers of private healthcare providers outside the NHS not following its policies.
• Finally, she cautions that, while innovation in healthcare is important, there must be a “proportionate level of monitoring, oversight, and regulation that does not stifle progress, but prevents creep of unproven approaches into clinical practice. Innovation must draw from and contribute to the evidence base”. [Cass Review Final Report, p. 231]

To critics who say the Cass Review tells us nothing new, surely the onus is on them to justify continuing to provide children and young people with “gender-affirming care”, care for which we already knew there is no reliable evidence on the medium-and long-term outcomes.

______________________

* Health is devolved in the UK; Scotland, Wales, and Northern Ireland (and indeed all other  healthcare services) are free to ignore the Cass Review’s findings, but may be unwise to do so.

Measurements of sulphur isotopes in Io’s atmosphere show that the moon may have been volcanically active for its entire lifetime

Cryptographers are scrambling to understand an algorithm that could undermine the mathematics behind next-generation encryption methods, which are intended to protect against quantum computers

A mathematical model of a particle that remembers its past so that it never travels the same path twice produces stunningly complex patterns

A new theory suggests that Titan’s majestic dune fields may have come from outer space. Researchers had always assumed that the sand making up Titan’s dunes was locally made, through erosion or condensed from atmospheric hydrocarbons. But researchers from the University of Colorado want to know: Could it have come from comets?

The dunes of Titan

When the Cassini spacecraft arrived in orbit around Saturn, nobody had ever seen beneath the thick soupy atmosphere of Titan. So when it dropped the Huygens lander, and began probing Titan with cloud-penetrating radar, scientists were surprised to learn that Titan has a very earth-like appearance. It has a thick nitrogen atmosphere, rain, rivers, oceans and massive dune fields. But unlike the dunes of Earth’s sandy deserts in Namibia and southern Arabia, Titan’s dunes are enormous, and fill massive fields covering more than an eighth of the giant moon’s surface. These dunes are about 100 meters tall, 1 to 2 km wide at the base, and can stretch for hundreds of kilometers in length.

Dunes on Earth are made from sand, which is blown by the wind and heaped into drifts. Individual sand particles are nudged and blown by the wind with enough force to make them bounce and scatter in a process called saltation. If the particles don’t bounce, then they cannot pile up on top of each other, but if the wind is able to lift them off the ground completely then they simply blow away. Saltation depends on the size and mass of the sand particles and the strength of the wind, but also needs the particles to be dry so that they can move freely without sticking together.

Titan’s geology

Titan is the second largest moon in the entire Solar System, beaten only by Ganymede, orbiting Jupiter. It is Saturn’s largest moon, and very old. Unlike most of Saturn’s moons, which were captured over time, Titan would have formed together with Saturn billions of years ago. Despite having so many features in common with Earth, it is a very different place. It is so intensely cold that, instead of water, its rain and rivers are made from liquid hydrocarbons like methane. Water, on the other hand, is frozen into hard ice; rocks on Titan are made from water ice, instead of granite and basalt, and Titan’s equivalent of lava and magma are made from liquid water and ammonia.

This means that sand on Titan is not made from silica eroded from larger rocks, since those materials are not found on the surface. One popular theory is that it could instead be made from ice. When liquid methane rains and flows, it could erode the water-ice bedrock, grinding chunks together to a sand of ice grains. An alternative idea is that the sand particles are instead made from tholins. These are found all over the colder regions of the Solar System, where cold hydrocarbons in comets or the outer atmospheres of planets and moons react with ultraviolet light from the Sun to create complex compounds. Tholins formed in the dry atmosphere of Titan could clump together with static electricity to form small grains of soot that then settle to the ground, creating both dust and sand.

Comet 109P/Swift-Tuttle captured during its last pass by Earth on Nov. 1, 1992. Credit: Gerald Rhemann What do comets have to do with this?

A paper presented at this year’s Lunar and Planetary Science Conference (LPSC) suggests a new idea: What if the sand came from comets? Comets, as we know, are made from materials left over from the creation of the Solar System. Most of the primordial gas and dust that collapsed from an ancient nebula to form the Solar System would have ended up in the Sun, with the bulk of the remains forming the planets. But this would still have left a lot of material floating free, and some of that would have gradually coalesced into lumps of dust and ice, which we see today as comets. When comets are nudged into elliptical orbits and pass through the inner Solar System, some of their ice heats up and sublimates into gas which blows out, carrying dust with it. This dust is scattered throughout the Solar System, concentrated along the various comet’s orbits. Individual grains often collide with the Earth, which we see as meteors, burning high in our atmosphere. Recent surveys in Antarctic ice fields, where there is no surface sand, have found many such particles which have survived atmospheric reentry.

But Earth is not the only place where these grains can end up. According to the researchers, there was a time when a great many comets were passing close by Saturn and its moons. They ran simulations to study the evolution of the Kuiper Belt, using a version of the Nice model. The Nice model, named for the city in which it was first presented, says that the Solar System was originally arranged very differently from how it is today. Over time, the planets migrated to their current locations. During this period, Neptune passed through the Kuiper belt, nudging many comets into new orbits. Many of these comets passed close by Saturn and its moons, and some even collided with the moons. The researchers suggest that much of the sand making up Titan’s dunes may be debris from all these comets.

Artist’s concept of Dragonfly soaring over the dunes of Saturn’s moon Titan. Credit: NASA/Johns Hopkins APL/Steve Gribben

But is it true? This idea does fit with what we currently know, and is supported by computer modelling, but so do the other theories. Fortunately, NASA recently confirmed that the Dragonfly mission will be launched in July 2028. Dragonfly is a lander, which will be sent to Titan. But unlike previous missions, this one is an 8-rotor flying drone. Like the rovers on Mars, it will be able to move to any areas of interest that scientists would like to study further. When it arrives in 2034, it will fly to dozens of locations on Titan’s surface, and should settle the question once and for all: Are the dunes of Titan really built from comet dust?

https://www.hou.usra.edu/meetings/lpsc2024/pdf/1550.pdf

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In the foundations of a Maya temple, researchers found the charred bones of royal individuals – possibly evidence of a fiery ritual to mark the end of one dynasty and the beginning of another

The BepiColombo mission, a joint effort between JAXA and the ESA, was only the second (and most advanced) mission to visit Mercury, the least explored planet in the Solar System. With two probes and an advanced suite of scientific instruments, the mission addressed several unresolved questions about Mercury, including the origin of its magnetic field, the depressions with bright material around them (“hollows”), and water ice around its poles. As it turns out, BepiColombo revealed some interesting things about Venus during its brief flyby.

Specifically, the two probes studied a previously unexplored region of Venus’ magnetic environment when they made their second pass on August 10th, 2021. In a recent study, an international team of scientists analyzed the data and found traces of carbon and oxygen being stripped from the upper layers of Venus’ atmosphere and accelerated to speeds where they can escape the planet’s gravitational pull. This data could provide new clues about atmospheric loss and how interactions between solar wind and planetary atmospheres influence planetary evolution.

The study was led by Lina Hadid, a CNRS researcher at the Plasma Physics Laboratory (LPP) and the Observatoire de Paris. She was joined by researchers from the Institute of Space and Astronautical Science (ISAS) at JAXA, the Max Planck Institute for Solar System Research (MPS), the CNRS Research Institute in Astrophysics and Planetology (IRAP), the Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), the Institute for Geophysics and Extraterrestrial Physics (IGEP), the Space Research Institute (SRI), and multiple universities.

Schematic view of planetary material escaping through Venus magnetosheath flank. Credit: Thibaut Roger/Europlanet 2024 RI/Hadid et al.

While Venus does not have an intrinsic magnetic field like Earth, it has a weak magnetic field that results from the interaction of solar wind and electrically charged particles in Venus’ upper atmosphere. Surrounding this “induced magnetosphere” is the “magnetosheath,” a region where the solar wind is slowed and heated. In August 2021, BepliColombo’s two spacecraft – the ESA’s Mercury Planetary Orbiter (MPO) and JAXA’s Mercury Magnetospheric Orbiter (MMO, aka. Mio) – passed by Venus on the final leg of their journey toward Mercury, using the planet’s gravity to adjust its course and its upper atmosphere to shed speed.

The two spacecraft spent 90 minutes passing through the tail of the magnetosheath and the magnetic regions closest to the Sun. The mission controllers used this opportunity to gather data on the number and mass of charged particles it encountered using Mio‘s Mass Spectrum Analyzer (MSA) and the Mercury Ion Analyzer (MIA), which are part of the probe’s Mercury Plasma Particle Experiment (MPPE). The team also relied on Europlanet’s Sun Planet Interactions Digital Environment on Request (SPIDER) space weather modeling tools to track how atmospheric particles propagated through the magnetosheath.

As Hadid explained in a Europlanet Society release, analysis of this data provides insight into the chemical and physical processes driving atmospheric escape from this region of the magnetosheath:

“This is the first time that positively charged carbon ions have been observed escaping from Venus’s atmosphere. These are heavy ions that are usually slow moving, so we are still trying to understand the mechanisms that are at play. It may be that an electrostatic ‘wind’ is lifting them away from the planet, or they could be accelerated through centrifugal processes.”

In particular, these findings could help scientists to deduce what happened to Venus’ surface water. Like Earth, much of Venus’ surface was once covered in oceans, which disappeared about 700 million years ago. The most widely-held theory is that this coincided with a massive resurfacing event that flooded the atmosphere with carbon dioxide, leading to a runaway Greenhouse Effect that vaporized the oceans. Over time, solar wind stripped away the water, leaving a thick atmosphere over 90 times as dense as Earth’s, and composed of carbon dioxide with smaller amounts of nitrogen and trace gases.

Artist’s impression of Venus with the solar wind flowing around the planet, which has little magnetic protection. Credit: ESA – C. Carreau

Two spacecraft that previously visited Venus – NASA’s Pioneer Venus Orbiter and ESA’s Venus Express -conducted detailed studies of atmospheric loss. However, their orbital paths left some areas unexplored, leaving many questions about the planet’s atmospheric dynamics unanswered. Said Moa Persson, a researcher from the Swedish Institute of Space Physics and a co-author on the study:

“Recent results suggest that the atmospheric escape from Venus cannot fully explain the loss of its historical water content. This study is an important step to uncover the truth about the historical evolution of the Venusian atmosphere, and upcoming missions will help fill in many gaps.”

Over the next decade, several more spacecraft are destined for Venus, including the ESA’s Envision mission, NASA’s Venus Emissivity, Radio Science, InSAR, Topography and Spectroscopy (VERITAS) orbiter and Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) probe, and India’s Shukrayaan orbiter. Collectively, these spacecraft will characterize the Venusian environment, magnetosphere, atmosphere, surface, and interior. This research could lead to improved models that predict how once-habitable planets could become hostile to life as we know it.

Further Reading: Euro Planet Society, Nature Astronomy

The post The Solar Wind is Stripping Oxygen and Carbon Away From Venus appeared first on Universe Today.

AI developments in chemical biology could unlock new types of disease treatments.

Wind power is a source of energy that is both affordable and renewable. However, decision-makers have been reluctant to invest in wind energy due to a perception that wind farms require a lot of land compared to electric power plants driven by fossil fuels. Research was based on the assessment of the land-use of close to 320 wind farms in the U.S. paints a very different picture.

Silicon-based electronics are approaching their physical limitations and new materials are needed to keep up with current technological demands. Two-dimensional (2D) materials have a rich array of properties, including superconductivity and magnetism, and are promising candidates for use in electronic systems, such as transistors. However, precisely controlling the properties of these materials is extraordinarily difficult.