Category: People

The downside of technology

A recent article in The Conversation prompted today’s post.

More and more I get concerned at some of the ways we are going.

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Deepfakes leveled up in 2025 – here’s what’s coming next

AI image and video generators now produce fully lifelike content. AI-generated image by Siwei Lyu using Google Gemini 3

Siwei Lyu, University at Buffalo

Over the course of 2025, deepfakes improved dramatically. AI-generated faces, voices and full-body performances that mimic real people increased in quality far beyond what even many experts expected would be the case just a few years ago. They were also increasingly used to deceive people.

For many everyday scenarios — especially low-resolution video calls and media shared on social media platforms — their realism is now high enough to reliably fool nonexpert viewers. In practical terms, synthetic media have become indistinguishable from authentic recordings for ordinary people and, in some cases, even for institutions.

And this surge is not limited to quality. The volume of deepfakes has grown explosively: Cybersecurity firm DeepStrike estimates an increase from roughly 500,000 online deepfakes in 2023 to about 8 million in 2025, with annual growth nearing 900%.

I’m a computer scientist who researches deepfakes and other synthetic media. From my vantage point, I see that the situation is likely to get worse in 2026 as deepfakes become synthetic performers capable of reacting to people in real time.

Dramatic improvements

Several technical shifts underlie this dramatic escalation. First, video realism made a significant leap thanks to video generation models designed specifically to maintain temporal consistency. These models produce videos that have coherent motion, consistent identities of the people portrayed, and content that makes sense from one frame to the next. The models disentangle the information related to representing a person’s identity from the information about motion so that the same motion can be mapped to different identities, or the same identity can have multiple types of motions.

These models produce stable, coherent faces without the flicker, warping or structural distortions around the eyes and jawline that once served as reliable forensic evidence of deepfakes.

Second, voice cloning has crossed what I would call the “indistinguishable threshold.” A few seconds of audio now suffice to generate a convincing clone – complete with natural intonation, rhythm, emphasis, emotion, pauses and breathing noise. This capability is already fueling large-scale fraud. Some major retailers report receiving over 1,000 AI-generated scam calls per day. The perceptual tells that once gave away synthetic voices have largely disappeared.

Third, consumer tools have pushed the technical barrier almost to zero. Upgrades from OpenAI’s Sora 2 and Google’s Veo 3 and a wave of startups mean that anyone can describe an idea, let a large language model such as OpenAI’s ChatGPT or Google’s Gemini draft a script, and generate polished audio-visual media in minutes. AI agents can automate the entire process. The capacity to generate coherent, storyline-driven deepfakes at a large scale has effectively been democratized.

This combination of surging quantity and personas that are nearly indistinguishable from real humans creates serious challenges for detecting deepfakes, especially in a media environment where people’s attention is fragmented and content moves faster than it can be verified. There has already been real-world harm – from misinformation to targeted harassment and financial scams – enabled by deepfakes that spread before people have a chance to realize what’s happening. https://www.youtube.com/embed/syNN38cu3Vw?wmode=transparent&start=0 AI researcher Hany Farid explains how deepfakes work and how good they’re getting.

The future is real time

Looking forward, the trajectory for next year is clear: Deepfakes are moving toward real-time synthesis that can produce videos that closely resemble the nuances of a human’s appearance, making it easier for them to evade detection systems. The frontier is shifting from static visual realism to temporal and behavioral coherence: models that generate live or near-live content rather than pre-rendered clips.

Identity modeling is converging into unified systems that capture not just how a person looks, but how they move, sound and speak across contexts. The result goes beyond “this resembles person X,” to “this behaves like person X over time.” I expect entire video-call participants to be synthesized in real time; interactive AI-driven actors whose faces, voices and mannerisms adapt instantly to a prompt; and scammers deploying responsive avatars rather than fixed videos.

As these capabilities mature, the perceptual gap between synthetic and authentic human media will continue to narrow. The meaningful line of defense will shift away from human judgment. Instead, it will depend on infrastructure-level protections. These include secure provenance such as media signed cryptographically, and AI content tools that use the Coalition for Content Provenance and Authenticity specifications. It will also depend on multimodal forensic tools such as my lab’s Deepfake-o-Meter.

Simply looking harder at pixels will no longer be adequate.

Siwei Lyu, Professor of Computer Science and Engineering; Director, UB Media Forensic Lab, University at Buffalo

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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I hope with all my heart that lines of defense will rise to the challenge.

A Resolution for 2026

Meditation.

I saw this article towards the end of December and wanted to share it with you. It was on The Conversation.

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What loving-kindness meditation is and how to practice it in the new year

Loving-kindness, the feeling cultivated in metta meditation, is very different from romantic love. Anna Sunderland Engels

Jeremy David Engels, Penn State

A popular New Year’s resolution is to take up meditation – specifically mindfulness meditation. This is a healthy choice.

Regular mindfulness practice has been linked to many positive health benefits, including reduced stress and anxiety, better sleep and quicker healing after injury and illness. Mindfulness can help us to be present in a distracted world and to feel more at home in our bodies, and in our lives.

There are many different types of meditation. Some mindfulness practices ask meditators simply to sit with whatever thoughts, sensations or emotions arise without immediately reacting to them. Such meditations cultivate focus, while granting more freedom in how we respond to whatever events life throws at us.

Other meditations ask practitioners to deliberately focus on one emotion – for example, gratitude or love – to deepen the experience of that emotion. The purpose behind this type of meditation is to bring more gratitude, or more love, into one’s life. The more people meditate on love, the easier it is to experience this emotion even when not meditating.

One such meditation is known as “metta,” or loving-kindness. As a scholar of communication and mindfulness, as well as a longtime meditation teacher, I have both studied and practiced metta. Here is what loving-kindness means and how to try it out for yourself:

Unbounded, universal love

Loving-kindness, or metta, is the type of love which is practiced by Buddhists around the world. Like many forms of meditation today, there are both secular and religious forms of the practice. One does not need to be a Buddhist to practice loving-kindness. It is for anyone and everyone who wants to live more lovingly.

Loving-kindness, the feeling cultivated in metta meditation, is very different from romantic love. In the ancient Pali language, the word “metta” has two root meanings: The first is “gentle,” in the sense of a gentle spring rain that falls on young plants, nourishing them without discrimination. The second is “friend.”

Metta is limitless and unbounded love; it is gentle presence and universal friendliness. Metta practice is meant to grow people’s ability to be present for themselves and others without fail. https://www.youtube.com/embed/FyKKvCO_vSA?wmode=transparent&start=0 A guided loving-kindness meditation practice.

Metta is not reciprocal or conditional. It does not discriminate between us and them, rich and poor, educated and uneducated, popular or unpopular, worthy and unworthy. To practice metta is to give what I describe in my research as “the rarest and most precious gift” – a gift of love offered without any expectation of it being returned.

How to practice loving-kindness meditation

In the fifth century, a Sri Lankan monk, Buddhaghosa, composed an influential meditation text called the “Visuddhimagga,” or “The Path of Purification.” In this text, Buddhaghosa provides instructions for how to practice loving-kindness meditation. Contemporary teachers tend to adapt and modify his instructions.

The practice of loving-kindness often involves quietly reciting to oneself several traditional phrases designed to evoke metta, and visualizing the beings who will receive that loving-kindness.

Traditionally, the practice begins by sending loving kindness to ourselves. It is typical during this meditation to say:

May I be filled by loving-kindness
May I be safe from inner and outer dangers
May I be well in body and mind
May I be at ease and happy

After speaking these phrases, and feeling the emotions they evoke, next it’s common to direct loving-kindness toward someone – or something – else: It can be a beloved person, a dear friend, a pet, an animal, a favorite tree. The phrases become:

May you be filled by loving-kindness
May you be safe from inner and outer dangers
May you be well in body and mind
May you be at ease and happy

Next, this loving-kindness is directed to a wider circle of friends and loved ones: “May they …”

The final step is to gradually expand the circle of well wishes: including the people in our community and town, people everywhere, animals and all living beings, and the whole Earth. This last round of recitation begins: “May we …”

In this way, loving-kindness meditation practice opens the heart further and further into life, beginning with the meditator themselves.

Loving-kindness and mindful democracy

Clinical research shows that loving-kindness meditation has a positive effect on mental health, including lessening anxiety and depression, increasing life satisfaction and improving self-acceptance while reducing self-criticism. There is also evidence that loving-kindness meditation increases a sense of connection with other people.

The benefits of loving-kindness meditation are not just for the individual. In my research, I show that there are also tremendous benefits for society as a whole. Indeed, the practice of democracy requires us to work together with friends, strangers and even purported “opponents.” This is difficult to do if our hearts are full of hatred and resentment.

Each time meditators open their hearts in metta meditation, they prepare themselves to live more loving lives: for their own selves, and for all living beings.

Jeremy David Engels, Liberal Arts Endowed Professor of Communication, Penn State

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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This is terrific and Jeremy Engels offers a very professional view of loving-kindness meditation. Personally I was not aware of the meaning of Metta.

The challenge is to adjust one’s daily routine to enable meditation to become part of our daily experience.

Picture Parade Five Hundred and Four

The pictures from my grandson.

My grandson, Morten, is quite an accomplished photographer. He uses my son’s previous camera, a Lumix DMC G7. Morten is fourteen. These photographs are locations in Southern England.

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Beautiful, Stunning, and Perfect.

It’s stating the obvious but all the above photographs are Copyright 2025 Morten Ronning, and All Rights Are Reserved.

Communities and the Fire Circle

A very ancient event that is still important today.

BBC Radio 4 is broadcasting this week a series of programmes under the title of ‘An Almanac for Anxiety: In Search of a Calmer Mind’. The first episode was Fire.

The history of fire circles spans ancient human gathering traditions, modern pagan rituals, and even fire performance art, evolving from basic survival and community building around fire to intentional spiritual circles for healing, transformation, or entertainment, with practices rooted in ancient fire veneration and a recent resurgence of shamanic/Pagan practices in Western culture, notes 4qf.org and Patheos.

The above was copied, in part, from a Google ‘AI’ article.

Photo by Peter Schulz on Unsplash

Here is a YouTube video on how to participate in a Fire Circle:

A Very Happy New Year!

Another lucky aspect of living in Oregon

We have not lost our wolves.

Here is a partial list of the wolf situation in Oregon:

  • Return & Recovery: Wolves reappeared in Oregon around 2008, descendants of wolves reintroduced in Idaho, growing to many packs across the state.
  • Management: The Oregon Department of Fish and Wildlife (ODFW) manages wolves under the Oregon Wolf Conservation and Management Plan.
  • Zones: Management differs between eastern and western Oregon, with federal listing status changing, affecting management authority.
  • Conservation Efforts: Organizations like Oregon Wild advocate for strong wolf protections, habitat connectivity, and non-lethal conflict deterrence.

However, in eastern North America things are not so good; as this article from The Coversation explains:

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With wolves absent from most of eastern North America, can coyotes replace them?

Coyotes have expanded across the United States. Davis Huber/500px via Getty Images

Alex Jensen, North Carolina State University

Imagine a healthy forest, home to a variety of species: Birds are flitting between tree branches, salamanders are sliding through leaf litter, and wolves are tracking the scent of deer through the understory. Each of these animals has a role in the forest, and most ecologists would argue that losing any one of these species would be bad for the ecosystem as a whole.

Unfortunately – whether due to habitat loss, overhunting or introduced species – humans have made some species disappear. At the same time, other species have adapted to us and spread more widely.

As an ecologist, I’m curious about what these changes mean for ecosystems – can these newly arrived species functionally replace the species that used to be there? I studied this process in eastern North America, where some top predators have disappeared and a new predator has arrived.

A primer on predators

Wolves used to roam across every state east of the Mississippi River. But as the land was developed, many people viewed wolves as threats and wiped most of them out. These days, a mix of gray wolves and eastern wolves persist in Canada and around the Great Lakes, which I collectively refer to as northeastern wolves. There’s also a small population of red wolves – a distinct and smaller species of wolf – on the coast of North Carolina.

The disappearance of wolves may have given coyotes the opportunity they needed. Starting around 1900, coyotes began expanding their range east and have now colonized nearly all of eastern North America.

A map of central to eastern North America. Parts of southern Canada are marked as 'current northeast wolf range,' the northeast US is marked 'current coyote and historical wolf range,' the rest of the southern and eastern US is marked 'red wolf range' and to the west is marked 'coyote range ~1900.'
Coyotes colonized most of eastern North America in the wake of wolf extirpation. Jensen 2025, CC BY

So are coyotes the new wolf? Can they fill the same ecological role that wolves used to? These are the questions I set out to answer in my paper published in August 2025 in the Stacks Journal. I focused on their role as predators – what they eat and how often they kill big herbivores, such as deer and moose.

What’s on the menu?

I started by reviewing every paper I could find on wolf or coyote diets, recording what percent of scat or stomach samples contained common food items such as deer, rabbits, small rodents or fruit. I compared northeastern wolf diets to northeastern coyote diets and red wolf diets to southeastern coyote diets.

I found two striking differences between wolf and coyote diets. First, wolves ate more medium-sized herbivores. In particular, they ate more beavers in the northeast and more nutria in the southeast. Both of these species are large aquatic rodents that influence ecosystems – beaver dam building changes how water moves, sometimes undesirably for land owners, while nutria are non-native and damaging to wetlands.

Second, wolves have narrower diets overall. They eat less fruit and fewer omnivores such as birds, raccoons and foxes, compared to coyotes. This means that coyotes are likely performing some ecological roles that wolves never did, such as dispersing fruit seeds in their poop and suppressing populations of smaller predators.

A diagram showing the diets of wolves and coyotes
Grouping food items by size and trophic level revealed some clear differences between wolf and coyote diets. Percents are the percent of samples containing each level, and stars indicate a statistically significant difference. Alex Jensen, CC BY

Killing deer and moose

But diet studies alone cannot tell the whole story – it’s usually impossible to tell whether coyotes killed or scavenged the deer they ate, for example. So I also reviewed every study I could find on ungulate mortality – these are studies that tag deer or moose, track their survival, and attribute a cause of death if they die.

These studies revealed other important differences between wolves and coyotes. For example, wolves were responsible for a substantial percentage of moose deaths – 19% of adults and 40% of calves – while none of the studies documented coyotes killing moose. This means that all, or nearly all, of moose in coyote diets is scavenged.

Coyotes are adept predators of deer, however. In the northeast, they killed more white-tailed deer fawns than wolves did, 28% compared to 15%, and a similar percentage of adult deer, 18% compared to 22%. In the southeast, coyotes killed 40% of fawns but only 6% of adults.

Rarely killing adult deer in the southeast could have implications for other members of the ecological community. For example, after killing an adult ungulate, many large predators leave some of the carcass behind, which can be an important source of food for scavengers. Although there is no data on how often red wolves kill adult deer, it is likely that coyotes are not supplying food to scavengers to the same extent that red wolves do.

Two wolves walking through the grass. One is sniffing a dead deer on the ground.
Wolves and coyotes both kill a substantial proportion of deer, but they focus on different age classes. imageBROKER/Raimund Linke via Getty Images

Are coyotes the new wolves?

So what does this all mean? It means that although coyotes eat some of the same foods, they cannot fully replace wolves. Differences between wolves and coyotes were particularly pronounced in the northeast, where coyotes rarely killed moose or beavers. Coyotes in the southeast were more similar to red wolves, but coyotes likely killed fewer nutria and adult deer.

The return of wolves could be a natural solution for regions where wildlife managers desire a reduction in moose, beaver, nutria or deer populations.

Yet even with the aid of reintroductions, wolves will likely never fully recover their former range in eastern North America – there are too many people. Coyotes, on the other hand, do quite well around people. So even if wolves never fully recover, at least coyotes will be in those places partially filling the role that wolves once had.

Indeed, humans have changed the world so much that it may be impossible to return to the way things were before people substantially changed the planet. While some restoration will certainly be possible, researchers can continue to evaluate the extent to which new species can functionally replace missing species.

Alex Jensen, Postdoctoral Associate – Wildlife Ecology, North Carolina State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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So there is a big difference between the Eastern seaboard and the Western States of the USA. We live in the forested part of Southern Oregon but I have never seen a wolf despite Alex Jensen writing that they inhabit this area.

The wolf is a magnificent animal, the forerunner of the dog. I would love to see a wolf!

Picture Parade Five Hundred and Two

I am very grateful for being given permission to republish these photographs.

They are from the website capturetheatlas.com and the photographer concerned is Dan Zafra.

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These photographs are perfect. The lighting, the landscape, the setting; just brilliant.

Dan Zafra is an artist!

Finally, we are at the shortest day of the year: the Winter Solstice.

Picking a fight ….

…. with a mathematical function!

This is another republication of a George Monbiot post. The title of his post is Total Futility Rate.

It is another great article!

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Total Futility Rate

Posted on15th December 2025

Let’s focus our campaigning on things we can actually change.

By George Monbiot, published as a BlueSky thread, 15th December 2025

Because the issue of population change is so widely misunderstood, I’ll seek to lay it out simply. This note explains why there is almost nothing anyone can do to change the global population trajectory, both as numbers rise, then as they fall.

The residual rise is due to:

A. The birth rate 60-100 years ago, which created a larger current base population. This means more children being born even as birth rates are in radical decline. The global total fertility rate, by the way, is now 2.2, just above the replacement rate of 2.1.

B. Infant mortality has declined very fast and longevity has risen very fast. Again, there’s nothing you can do about either of those things and, I hope, nothing you would want to.

All women should have total reproductive freedom and full access to modern birth control. Because it’s a fundamental right. Not because old men on other continents want them to have fewer children. Even if total reproductive freedom became universal now, it would scarcely nudge the curve, due to the factors mentioned above.

Before long, people will be fretting instead about the downwave, a very rapid decline in populations as the impact of 60+ years of falling birth rates overtakes the effects mentioned above. There’s almost nothing we can do about that either. It’s about as locked in as any human behaviour can be. As the opportunity costs of childcare rise (i.e. as prosperity increases), the birth rate declines.

Of course, if economic and social life collapsed, the process might go into reverse, and birth rates could be expected to rise again. But is that really what you want? For my part, I’m heartily sick of people who think collapse is the answer to anything.

In the short run, we can survive the decline in wealthy countries by reopening the door to immigrants, which would also offer sanctuary to people fleeing from the climate breakdown and conflict we’ve caused overseas. Two wins, in other words. In the long run, we’ll steadily shuffle away.

Whether you think that’s good or bad will not affect the outcome. I see demographic change as an underlying factor, like gravity, we simply have to adapt to as well as we can. If you want to pick a fight with a mathematical function, be my guest. But it seems to me as if you’re wasting your time.

But surely there’s no harm in it? Surely we can seek, however hopelessly, to change the population trajectory while also campaigning against environmental breakdown, inequality, injustice? Some people who worry about population do. But in my experience, most fixate on population to the exclusion of other issues.

Something must be done about them breeding too fast, rather than us consuming too fast. All too often, residual population growth is used as a scapegoat to shift blame from rich-world impacts, which means that the people in places where growth is still occurring are themselves scapegoated. The result, broadly speaking, is wealthy white people pointing the finger at much poorer Black and Brown people and saying, “You’re the problem.” It’s more than a distraction, it’s a grim and sometimes racist alternative to effective action. It’s an excuse for inaction.

So yes, do both if you want to, while being aware that one activity is useful and the other is futile. But be aware that for most population obsessives, it’s either/or, and is used to avoid moral responsibility and effective citizenship.

http://www.monbiot.com

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If you read this you will understand why Mr Monbiot explains clearly the changes in the global demographics: That the global population is falling. My own guess is that in the lifespans of those who today are in their teens, the global population will be remarkably lower. I can’t forecast the changes that will bring about but I’m certain they will be significant.

George’s last point is key “(It) is used to avoid moral responsibility and effective citizenship.“

This is counter-intuitive.

The universe and normal matter.

Frequently I look up at the night sky and ponder about so many things that I cannot understand. I wish I did but it is far too late now. But that doesn’t stop me from reading about the science and more. Here is a perfect example of that and I am delighted to be able to share it with you.

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Most normal matter in the universe isn’t found in planets, stars or galaxies – an astronomer explains where it’s distributed

Mysterious blasts of radio waves from across the universe called fast radio bursts help astronomers catalog matter. ESO/M. Kornmesser, CC BY-SA

Chris Impey, University of Arizona

If you look across space with a telescope, you’ll see countless galaxies, most of which host large central black holes, billions of stars and their attendant planets. The universe teems with huge, spectacular objects, and it might seem like these massive objects should hold most of the universe’s matter.

But the Big Bang theory predicts that about 5% of the universe’s contents should be atoms made of protons, neutrons and electrons. Most of those atoms cannot be found in stars and galaxies – a discrepancy that has puzzled astronomers.

If not in visible stars and galaxies, the most likely hiding place for the matter is in the dark space between galaxies. While space is often referred to as a vacuum, it isn’t completely empty. Individual particles and atoms are dispersed throughout the space between stars and galaxies, forming a dark, filamentary network called the “cosmic web.”

Throughout my career as an astronomer, I’ve studied this cosmic web, and I know how difficult it is to account for the matter spread throughout space.

In a study published in June 2025, a team of scientists used a unique radio technique to complete the census of normal matter in the universe.

The census of normal matter

The most obvious place to look for normal matter is in the form of stars. Gravity gathers stars together into galaxies, and astronomers can count galaxies throughout the observable universe.

The census comes to several hundred billion galaxies, each made of several hundred billion stars. The numbers are uncertain because many stars lurk outside of galaxies. That’s an estimated 1023 stars in the universe, or hundreds of times more than the number of sand grains on all of Earth’s beaches. There are an estimated 1082 atoms in the universe.

However, this prodigious number falls far short of accounting for all the matter predicted by the Big Bang. Careful accounting indicates that stars contain only 0.5% of the matter in the universe. Ten times more atoms are presumably floating freely in space. Just 0.03% of the matter is elements other than hydrogen and helium, including carbon and all the building blocks of life.

Looking between galaxies

The intergalactic medium – the space between galaxies – is near-total vacuum, with a density of one atom per cubic meter, or one atom every 35 cubic feet. That’s less than a billionth of a billionth of the density of air on Earth. Even at this very low density, this diffuse medium adds up to a lot of matter, given the enormous, 92-billion-light-year diameter of the universe.

The intergalactic medium is very hot, with a temperature of millions of degrees. That makes it difficult to observe except with X-ray telescopes, since very hot gas radiates out through the universe at very short X-ray wavelengths. X-ray telescopes have limited sensitivity because they are smaller than most optical telescopes.

Deploying a new tool

Astronomers recently used a new tool to solve this missing matter problem. Fast radio bursts are intense blasts of radio waves that can put out as much energy in a millisecond as the Sun puts out in three days. First discovered in 2007, scientists found that the bursts are caused by compact stellar remnants in distant galaxies. Their energy peters out as the bursts travel through space, and by the time that energy reaches the Earth, it is a thousand times weaker than a mobile phone signal would be if emitted on the Moon, then detected on Earth.

Research from early 2025 suggests the source of the bursts is the highly magnetic region around an ultra-compact neutron star. Neutron stars are incredibly dense remnants of massive stars that have collapsed under their own gravity after a supernova explosion. The particular type of neutron star that emits radio bursts is called a magnetar, with a magnetic field a thousand trillion times stronger than the Earth’s.

An illustration of a bright star with circular rings around it representing magnetic field lines
A magnetar is a rare type of neutron star with an extremely strong magnetic field. ESO/L. Calçada, CC BY-ND

Even though astronomers don’t fully understand fast radio bursts, they can use them to probe the spaces between galaxies. As the bursts travel through space, interactions with electrons in the hot intergalactic gas preferentially slow down longer wavelengths. The radio signal is spread out, analogous to the way a prism turns sunlight into a rainbow. Astronomers use the amount of spreading to calculate how much gas the burst has passed through on its way to Earth.

Puzzle solved

In the new study, published in June 2025, a team of astronomers from Caltech and the Harvard Center for Astrophysics studied 69 fast radio bursts using an array of 110 radio telescopes in California. The team found that 76% of the universe’s normal matter lies in the space between galaxies, with another 15% in galaxy halos – the area surrounding the visible stars in a galaxy – and the remaining 9% in stars and cold gas within galaxies.

The complete accounting of normal matter in the universe provides a strong affirmation of the Big Bang theory. The theory predicts the abundance of normal matter formed in the first few minutes of the universe, so by recovering the predicted 5%, the theory passes a critical test.

Several thousand fast radio bursts have already been observed, and an upcoming array of radio telescopes will likely increase the discovery rate to 10,000 per year. Such a large sample will let fast radio bursts become powerful tools for cosmology. Cosmology is the study of the size, shape and evolution of the universe. Radio bursts could go beyond counting atoms to mapping the three-dimensional structure of the cosmic web.

Pie chart of the universe

Scientists may now have the complete picture of where normal matter is distributed, but most of the universe is still made up of stuff they don’t fully understand.

The most abundant ingredients in the universe are dark matter and dark energy, both of which are poorly understood. Dark energy is causing the accelerating expansion of the universe, and dark matter is the invisible glue that holds galaxies and the universe together.

A pie chart showing the composition of the universe. The largest proportion is dark energy, at 68%, while dark matter makes up 27% and normal matter 5%. The rest is neutrinos, free hydrogen and helium and heavy elements.
Despite physicists not knowing much about it, dark matter makes up around 27% of the universe. Visual Capitalist/Science Photo Library via Getty Images

Dark matter is probably a previously unstudied type of fundamental particle that is not part of the standard model of particle physics. Physicists haven’t been able to detect this novel particle yet, but we know it exists because, according to general relativity, mass bends light, and far more gravitational lensing is seen than can be explained by visible matter. With gravitational lensing, a cluster of galaxies bends and magnifies light in a way that’s analogous to an optical lens. Dark matter outweighs conventional matter by more than a factor of five.

One mystery may be solved, but a larger mystery remains. While dark matter is still enigmatic, we now know a lot about the normal atoms making up us as humans, and the world around us.

Chris Impey, University Distinguished Professor of Astronomy, University of Arizona

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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The details are incredible. Take for example that three-quarters of the matter out there is found outside the galaxies. Or that there are more stars in the universe than all of the sand grains on Planet Earth.

Just amazing!

Rebecca Stott

Speaks on BBC Radio 4 this week.

Let me offer you Rebecca Stott’s website.

Now I am going to republish that site because it is the only way I can think of to spread the word more widely.

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Rebecca also writes for radio. She has been a frequent broadcaster on BBC Radio Four over the years.

Her radio essay ‘Reflections on My Mother’s Kenwood Mixer’, a homage to her mother’s gritty resilience in times of trouble, promoted scores of people on Twitter and Facebook to share stories about Kenwoods and their own steely mothers. Her essay ‘On Waiting’, tells the story of being marooned with her daughters at dusk in a bus-stop in remote Norfolk during a Covid lockdown. Her essay ‘House Clearing’ tells the story of the strangeness of dismantling her mother’s house after she had moved into a carehome. And her final essay for the programme, ‘On Migration’, describes an astonishing ten days in which hundreds of wild geese flew across the skies of her home town, as well the story of the great philosopher Aristotle study of migrating birds whilst himself a migrant in flight for his life on the island of Lesbos.

You’ll find a link to Rebecca’s Private Passions episode here too. A kind of Desert Island Discs without the Desert Island…. and with the extraordinary composer Michael Berkeley in the interview seat.

Also here is her five-part series commissioned by Radio Four in 2025 called Beautiful Strangeness. You can find the link below.

https://www.bbc.co.uk/programmes/m002fv7z/episodes/player

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Being the age I am, Rebecca’s Beautiful Strangeness programmes spoke to me in a way that I find difficult to put into words but nonetheless the series did.

Perfect!