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When our Sun dies, it will turn into a white dwarf. They are a common aspect of stellar evolution and a team of researchers have now turned their attention onto them. They have just completed a survey of 26,000 white dwarfs and confirmed a long-predicted theory that the hotter the star, the puffier it is! This new study will help us to understand white dwarfs and the processes that drive them. 

All stars age. Our Sun is a giant ball of electrically charged gas and, during the majority of its life will be fusing hydrogen to helium in its core. During this process, the fusion will generate an outward pushing force known as thermonuclear pressure which will for the most part, balance the inward pull of gravity. Eventually, the thermonuclear force will overcome the force of gravity and the star will shed its outer layers, leaving behind a dense, hot core. The core is known as a white dwarf and it is this which, despite its small size and incredibly high density, has captivated astronomers. 

The solar surface in visible light composed of data from Solar Orbiter’s instrument PHI from March 22, 2023

One of the more fascinating aspects of white dwarf stars is their relationship between temperature and density. Theory suggests that the hotter a white dwarf star becomes, the less dense and more puffy its outer layers become. The lower density is thought to be driven by an increase in energy pushing outward which comes from an increased core temperature. Typically the core of a white dwarf can reach between 5,000 to 10,000 Kelvin. 

This artist’s impression shows the magnetic white dwarf WD 0816-310. Credit: ESO/L. Calçada

The team of astronomers led by Nicole Crumpler from the John Hopkins University published the results of their findings in the Astrophysical Journal. They hope that their work will take us a step closer to being able to exploit white dwarfs as natural stellar laboratories to unravel the mysteries of dark matter! The secret, the team believe, is in the puffy nature of white dwarfs. “If you want to look for dark matter, quantum gravity, or other exotic things, you better understand normal physics,” said Crumpler, “otherwise, something that seems novel might be just a new manifestation of an effect that we already know.”

At its core is the fact that these stellar corpses are composed of material far heavier than normal matter.  A teaspoon of their material weighs around a ton, clearly far more than ordinary matter. With all that mass packed so tightly into the small stellar corpse, the gravitational pull is far higher than here on Earth. 

The study focussed on measuring how these high material densities influence light waves travelling away from the star. The waves will lose energy, stretching the radiation and ‘red-shifting’ it so telescopes can measure it. By averaging the measurements of white dwarf stars and their motions relative to Earth, the team were able to isolate the redshift from the affect of gravity to calculate how high the temperatures are and therefore influence the gas density in outer layers. 

Artist impression of ESA’s Gaia satellite observing the Milky Way (Credit : ESA/ATG medialab; Milky Way: ESA/Gaia/DPAC)

To conclude their study, the team used data from the Solan Digital Sky Survey and the ESA Gaia mission. Together these observation programs have recorded positions of millions of stellar objects. By studying tens of thousands of white dwarfs the team hope that probing the nature of the matter will help to understand more about its nature, about the nature of dark matter and the nature of the structure of the white dwarf stars that pervade our Galaxy. 

Source : Survey of 26,000 dead stars confirms key details of extreme stellar behavior

The post Hotter White Dwarfs Get Puffier appeared first on Universe Today.

Gaze up at the Moon on any night and you will see a barren world displaying all manner of shades of grey. Aside from the obvious craters and lunar maria, the surface of the Moon is covered in the fine, dusty lunar regolith. The Apollo astronauts in the 60’s and 70’s learned that it was electromagnetically charged and was very abrasive posing a problem for mechanical equipment. Now a new payload on the Commercial Lunar Payload Services initiative will explore the regolith even further. 

The Moon is our only natural satellite. It has a diameter of 3,474 kilometres and is about a quarter the size of the Earth. Orbiting Earth at a distance of 384,400 kilometres, the Moon is our closest neighbour and has inspired artists, authors and scientists alike. From Earth we can only see half of the Moon, the near side due to a phenomenon known as captured or synchronus rotation. The countless craters are the result of meteorite strikes ont eh lunar surface and the darker, larger lunar maria are vast plains of darker solidified lava. As experienced by the Apollo astronauts, the surface is covered in a fine powdery material known as the lunar regolith.

The Moon on August 24, 2023, with the eQuinox 2 telescope by Unistellar. Credit: Nancy Atkinson.

The lunar regolith is the loose, dusty layer of material that covers the solid bedrock of the surface of the Moon. It’s made up of tiny fragments which have been created from the pulverisation of lunar rocks over billions of years by meteoric impacts. It’s mostly composed of minerals like silicates, feldspar and pyroxenes and small quantities of metals too. Whilst it can pose a real challenge to lunar explorers due to its abrasive nature it can also be used to produce oxygen and water and can be a fabulous material for construction of lunar habitats. 

A close-up view of astronaut Buzz Aldrin’s bootprint in the lunar soil, photographed with the 70mm lunar surface camera during Apollo 11’s sojourn on the moon. There’ll soon be more boots on the lunar ground, and the astronauts wearing those boots need a way to manage the Moon’s low gravity and its health effects. Image by NASA

Understanding the nature of the lunar regolith is the task of a new science instrument called RAC-1 (Regolith Adherence Characterisation) that will be heading toward the Moon as part of the Commercial Lunar Payload Services (CLPS) initiative. It will be transported to the lunar surface by the Blue Ghost 1 Lunar Lander. CLPS is a program setup by NASA to aid the development of lunar exploration by bringing companies together and taking their payloads to the Moon. It aims to support the Artemis program by providing innovation to space exploration and to help understand more about the lunar environment. 

NASA has selected three commercial Moon landing service providers that will deliver science and technology payloads under Commercial Lunar Payload Services (CLPS) as part of the Artemis program. Each commercial lander will carry NASA-provided payloads that will conduct science investigations and demonstrate advanced technologies on the lunar surface, paving the way for NASA astronauts to land on the lunar surface by 2024…The selections are:..• Astrobotic of Pittsburgh has been awarded $79.5 million and has proposed to fly as many as 14 payloads to Lacus Mortis, a large crater on the near side of the Moon, by July 2021…• Intuitive Machines of Houston has been awarded $77 million. The company has proposed to fly as many as five payloads to Oceanus Procellarum, a scientifically intriguing dark spot on the Moon, by July 2021…• Orbit Beyond of Edison, New Jersey, has been awarded $97 million and has proposed to fly as many as four payloads to Mare Imbrium, a lava plain in one of the Moon’s craters, by September 2020. ..All three of the lander models were on display for the announcement of the companies selected to provide the first lunar landers for the Artemis program, on Friday, May 31, 2019, at NASA’s Goddard Space Flight Center in Greenbelt, Md. ..Read more: https://go.nasa.gov/2Ki2mJo..Credit: NASA/Goddard/Rebecca Roth

RAC-1 will study the lunar regolith on arrival at the lunar surface. It was developed by Aegis Aerospace from Texas, a company that specialises in space systems engineering, technology development and mission support services. The device will explore how the lunar regolith adheres and sticks to certain surfaces to help understand how it can damage and interfere with mechanical and scientific instruments. This will help understand factors such as electrostatic attraction, abrasive and adherence forces. The low gravity of the Moon and lack of atmosphere will have an impact on how the dust behaves to help understand long term exposure to the harsh lunar environment. 

It works by exposing 15 sample materials to the regolith. These include fabrics, paint coatings, optical sensors, solar cells and more. It will measure rates of accumulation during the landing phase and other segments of the mission to learn which materials are best at repelling or shedding collected dust. Future missions like the Artemis program will greatly benefit from these studies. 

Source : NASA Science Payload to Study Sticky Lunar Dust Challenge

The post NASA to Probe the Secrets of the Lunar Regolith appeared first on Universe Today.

Located in Tuscon, Arizona, the National Optical-Infrared Astronomy Research Laboratory (NOIRLab) is a national facility consisting of four observatories that provide astronomers affiliated with any US institution with access to observing time. As part of its mission to advance astronomy and science education, NOIRLab recently announced the release of the 88 Constellations Project, a collection of free, high-resolution, downloadable images of all IAU-recognized constellations. This project is an educational archive that is free for all and includes the largest open-source all-sky photo of the night sky.

The high-quality images behind this collection were taken by German astrophotographer Eckhard Slawik (whose portfolio can be found here). The images were taken on film, and each panel consists of two separate exposures, with and without a diffuser filter, to emphasize the stars’ colors. The collection is arranged alphabetically, from Andromeda to Vulpecula, and includes information on the historic origins of each constellation, their brightest stars, their stick-figure diagram, how to find them, and prominent deep-sky objects within them.

Photo of the constellation Andromeda with annotations from IAU and Sky & Telescope. Credit: E. Slawik/NOIRLab/NSF/AURA/M. Zamani

Images of these deep-sky objects, captured by telescopes at NOIRLab’s four participating observatories, are also provided. These include distant galaxies, star clusters, nebulae, black holes, and other notable astronomical objects. The collection also includes educational resources for teachers, like flashcards and audiovisual resources that can be used at the primary and secondary levels. NOIRLab also recommends the 88 Constellations project be used as a resource in planetariums and museums.

The all-sky photo, also the work of Slawik, was created using images taken from the darkest locations around the world. At 40,000 pixels, it is arguably one of the most detailed and beautiful images of the night sky ever made. The full collection can be found on the NOIRLab project webpage.

Further Reading: NOIRLab

The post NOIRLab Launches Collection of Hi-Res Images of 88 IAU-recognized Constellations appeared first on Universe Today.

Saturn’s rings are among the most glorious, stunning, and well-studied features in the Solar System. However, their age has been difficult to ascertain. Did they form billions of years ago when the planet and the Solar System were young? Or did they form in the last few hundred millions of years?

The latest new research shows that the iconic rings are, in fact, very old.

We first became aware of Saturn’s opulent rings hundreds of years ago. Galileo was the first to see them, though he couldn’t tell they were rings in his early telescope. Nobody had ever seen anything like them before, obviously, and he thought they were moons. When he observed the planet two years later, the ‘moons’ had disappeared, leaving him confused. Another two years passed, and when he observed Saturn again, they had returned. However, the viewing angle had changed, and what he once thought were moons he concluded were ‘arms’ of some sort.

Top: Galileo’s sketch of Saturn from 1610. Bottom: Galileo’s sketch of Saturn from 1616. Image Credit: Galileo Galilei. ;<)

Decades later, Christian Huygens had a much better telescope and deduced that the features were actually rings. He described them as a “thin, flat ring, nowhere touching the planet, inclined to the ecliptic plane, and surrounding the planet without touching it.”

Fast forward to our modern age of space exploration, and scientists have gotten much better looks at Saturn and its rings. Voyager 1 and Voyager 2 opened our eyes to Saturn’s unique rings when they flew past the planet in 1980 and 1981. Those images began to reveal some of the rings’ complexity, including unusual ‘spoke’ shapes. The mystery deepened.

This Voyager 2 image from August 1981 shows the unusual dark, spoke shapes in the rings. Image Credit: NASA/JPL-Caltech

When the Hubble Space Telescope launched, it brought Saturn’s rings to life with its stunning images. It confirmed that the rings aren’t uniform and contain many fainter inner rings and ringlets. It also found that icy particles from the rings rain down on Saturn and help heat its atmosphere.

However, the Cassini spacecraft has revealed the most about Saturn’s rings. It spent 13 years investigating Saturn, its moons, and its rings.

Cassini’s data has transformed our understanding of the gas giant. No longer were scientists restricted to telescope images or fleeting flybys from the Voyager spacecraft. Cassini captured unprecedented close-up views of Saturn and its rings and gathered detailed measurements.

This is the highest-resolution image ever captured of Saturn’s rings. It shows part of the B ring. The different ringlets are part of the B-ring’s irregular structure. Cassini captured this image in July 2017. Image Credit: NASA/JPL-Caltech/Space Science Institute

Cassini revealed the complex dynamics at play in the rings and intricate details, including kinks and clumps. It showed us how the rings change over time due to Saturn’s gravity and all of its moons and moonlets. One of its biggest discoveries is that the rings are largely composed of water ice.

However, scientists are still uncertain exactly how old the rings are. Different researchers come up with different results. Some say they’re billions of years old, while others say they’re as young as 100 million years old.

New research in Nature Geoscience suggests that the rings cannot be only a few hundred million years old. It’s titled “Pollution resistance of Saturn’s ring particles during micrometeoroid impact.” The lead author is Ryuki Hyodo, a planetary scientist associated with JAXA and several universities and space agencies.

The young estimates for Saturn’s rings’ ages stem from their colouration. They appear to be clean despite their expected bombardment by micrometeoroids. The models that arrived at youthful estimates were based on high accretion rates for micrometeoroids. The logic says that if micrometeoroids bombard the ring particles and accrete efficiently, the rings should be much darker than they appear to be. Hence, they must be young. Estimates based on this arrive at an age of between 100 and 400 million years for Saturn rings.

However, those models are based on highly efficient accretion rates for micrometeoroids onto icy particles in the rings.

In the new research, Hyodo and his fellow researchers simulated the hypervelocity impacts of micrometeoroids striking icy particles. They found that the accretion may not be as efficient as previous research suggested. Instead, the non-icy micrometeorites can be vaporized, expand, and then form charged particles and ions.

These particles then leave the ring system via three main processes. They either collide with Saturn, leave the planet’s gravitational field, or are dragged into Saturn’s atmosphere electromagnetically.

This figure from the research summarizes the simulation results. a) Micrometeoroid impacts on Saturn’s rings occur at impact velocities of ~30 km?s–1. b) The impactor materials are highly shocked (>100?GPa) and form hot expanding vapour (>10,000?K). Only a small fraction of the ring particles (mass comparable to the impactor) is vaporized. c) The impact-generated vapour expands with a high velocity (on average >14?km?s–1), producing atoms/molecules and forming nanoparticles as condensates. The silicate vapour is more prone to condensation than water vapour. d) Atoms or molecules are ionized, nanoparticles are charged in Saturn’s magnetosphere, and impactor materials are removed from the ring plane by direct collision with Saturn, by escape from Saturn’s gravitational field, or by being dragged into Saturn by interaction with the electromagnetic field. Image Credit: Hyodo et al. 2024. Credit: d, NASA Goddard Space Flight Center.

The critical part of the study and how it differs from previous efforts is in the accretion efficiency of micrometeorites. Previous models used an accretion efficiency of greater than or equal to 10%. However, this study shows that the actual accretion efficiency might be much lower, greater than or equal to only 1%. That means that the rings could be much older and only appear to be clean because micrometeoroids don’t accrete as efficiently as thought and don’t ‘dirty’ the appearance of the rings.

“Thus, we suggest that the apparent youth of Saturn’s rings could be due to pollution resistance rather than indicative of young formation age,” the authors write.

This won’t be the last word on Saturn’s rings and their ages. All models have limitations, and Hyodo and his co-researchers acknowledge some limitations in theirs. Their model doesn’t account for porosity, strength, or the granularity of the ring particles.

Still, the study emphasizes that dynamic forces are at play that need to be considered in the evolution of planetary bodies and that some of our long-held assumptions need to be questioned.

The post Saturn’s Rings Might Be Really Old After All appeared first on Universe Today.

A team has reported a Raman microscopy technique that produced images up to eight times brighter than those achieved with conventional Raman techniques. Imaging of frozen biological samples reduced the noise introduced by the motion of material over long acquisition times. The technique is expected to broaden understanding in many areas of the biological sciences by allowing high-quality images and chemical information to be captured without the need for staining.

A team has reported a Raman microscopy technique that produced images up to eight times brighter than those achieved with conventional Raman techniques. Imaging of frozen biological samples reduced the noise introduced by the motion of material over long acquisition times. The technique is expected to broaden understanding in many areas of the biological sciences by allowing high-quality images and chemical information to be captured without the need for staining.

In a breakthrough set to revolutionize the semiconductor industry, engineers have developed the world's first-of-its-kind deep-ultraviolet (UVC) microLED display array for lithography machines. This enhanced efficiency UVC microLED has showcased the viability of a lowered cost maskless photolithography through the provision of adequate light output power density, enabling exposure of photoresist films in a shorter time.

In a breakthrough set to revolutionize the semiconductor industry, engineers have developed the world's first-of-its-kind deep-ultraviolet (UVC) microLED display array for lithography machines. This enhanced efficiency UVC microLED has showcased the viability of a lowered cost maskless photolithography through the provision of adequate light output power density, enabling exposure of photoresist films in a shorter time.

Engineers have developed a new signal analysis technology that enhances radar range resolution and is applicable to various radar systems.

A research team achieves 63% energy storage efficiency and 5.17% overall efficiency by combining a supercapacitor with a solar cell.

A research team achieves 63% energy storage efficiency and 5.17% overall efficiency by combining a supercapacitor with a solar cell.

A team has developed a stable, efficient polymer-based solid electrolyte -- Applicable to smartphones, EVs, and energy storage.

A team has developed a stable, efficient polymer-based solid electrolyte -- Applicable to smartphones, EVs, and energy storage.

Not long ago I mentioned that The Free Press had published a weird piece extolling religion: an atheist beefing that she really missed the goddy parts of Christmas even though she wasn’t a believer. She needed to go to church. With that, I wondered whether softness on religion was becoming part of anti-wokeness, or at least that news site.

Now, with the publication of a new longer piece, The Free Press has buttressed my speculations. For this article not only names and tells the stories of a number of notables who decided to embrace religion (largely Christianity), but also implies that there are good reasons for them to do so.  Mostly it’s the “God-shaped hole in our being”: the dubious idea that humans have an innate—and perhaps evolved—need to find a divine being to worship and give then succor.  Indeed, several people (including Ayaan Hirsi Ali, whose embrace of Christianity we’ve discussed before) explicitly mention that religion is what gives their life meaning.

If that is the case, good for them. But of course many of us find meaning and purpose without religion. Indeed, as I’ve argued, people often don’t go out looking for meaning and purpose to their lives, but simply enact their lives in a way that winds up giving them meaning and purpose.  Those things can be found in children, family, friends, activities (be they physical, intellectual, or humanitarian) and so on.

The biggest issue with this article, though, is that it is completely devoid of any evidence for the truth of the tenets of religion. It’s touting faith as a balm for wounded souls, and, so the narrative goes, one should accept God to get cured–regardless of whether what you believe is true. Indeed, it quotes Andrew Sullivan on the advantage of not having to have good reasons to believe:

The question swirling around all the new believers was: Were they true believers? Or was their conversion mostly or entirely utilitarian—driven by a desire to push back against the forces of technology and secularism and wokeness and an increasingly militant Islam? Did they actually believe that Jesus Christ was the son of God and that he had died for our sins and was resurrected? Or did they think that was a nice story that we should tell ourselves because it encouraged people to treat each other better—because it was a kind of cultural bulwark? And did it really matter in the end?

Andrew Sullivan, the writer and podcaster, suggested this might not be easy to answer. “The feeling”—of believing—“will vary,” Sullivan, a Catholic, told me. “Sometimes, there’s no feeling. Sometimes, you’re overwhelmed. The point really is to escape feeling as such—our emotions are not what prove anything.”

“The genius of ritual is that it allows us not to articulate our feelings,” Sullivan said. “It allows us to express our faith through an act.”

Well, I don’t find that “genius”. If your faith depends on believing that Jesus died for our sins, was bodily resurrected, and then became the only route to Heaven, then you bloody well better have good reasons for thinking that. It was the achievement of New Atheism to show that peoples’ reasons are not good ones.  If your eternal life (and its location) depends on believing the truths espoused by your faith, it’s salubrious to have chosen the right faith. But people don’t worry about that; they usually assume the faith they were taught as children.

Click on the screenshot below to read the piece, or find it archived here.

Here are the names in each of the “I found God” anecdotes. Excerpts are indented; bolding is mine:

1.) In the beginning, Matthew Crawford believed in nothing.

“The question of God wasn’t even on the radar,” the best-selling author told me.

. . . .“A lot of very thoughtful people who once believed reason and science could explain everything—why we’re here, what comes after we’re gone, what it all means—are now feeling a genuine hunger for something more,” he said.

“There has to be a larger order that comprehends us and makes a demand on us,” Crawford added. “It’s clear that we can’t live without a sense of meaning beyond ourselves.”

Has to be?  Why?  And of course if you find “meaning and purpose” in things like friends, family, work, and avocation, then that is a “sense of meaning” that doesn’t need the supernatural.

2.) But something profound is happening. Instead of smirking at religion, some of our most important philosophers, novelists, and public intellectuals are now reassessing their contempt for it. They are wondering if they might have missed something. Religion, the historian Niall Ferguson told me, “provides ethical immunity to the false religions of Lenin and Hitler.”

Again, we are supposed to believe that these important intellectuals might have missed out by neglecting God.  But the effects of religious belief give no evidence for the truth of its tenets.

3.) In February 2024, podcaster Joe Rogan, in a conversation about the sorry state of America’s youth with New York Jets quarterback Aaron Rodgers, said: “We need Jesus.” Not five years earlier, Rogan had hosted Richard Dawkins on his show and poked fun at Christians.

Why Jesus? Is there evidence that he was who he said he was, and that believing in Jesus is the only way to heaven? Maybe we need Muhammad or Buddha.

Anyway, many of us don’t need Jesus.

Note the swipe at Dawkins. The article makes fun of New Atheists throughout; it’s almost like that contempt was ripped from Pharyngula. There’s even a section called “The Rise and Fall of the New Atheists”.  Well, New Atheists aren’t writing their books any more, as they’ve had their say, but the decline of faith in the Western world (not just the U.S.) is sufficient evidence that the anecdotes of this article go against a trend of decreasing religiosity.

4.) In April, the comedian Russell Brand—who has emerged in recent years as a voice of the counterculture and amassed an audience of more than 11 million on X—announced that he was about to be baptized. “I know a lot of people are cynical about the increasing interest in Christianity and the return to God but, to me, it’s obvious. As meaning deteriorates in the modern world, as our value systems and institutions crumble, all of us become increasingly aware that there is this eerily familiar awakening and beckoning figure that we’ve all known all our lives within us and around us. For me, it’s very exciting.”

It’s almost as if his social-media following validates his beliefs.  And again, why Christianity? How does Brand, who I thought was smarter than this, know that Christianity is the religion with the “right” claims? Why not Islam or Judaism?

5.) In May, tech mogul Peter Thiel, who had espoused a vague spirituality and had been friends with the late French philosopher and religious thinker René Girard, came down unequivocally on the side of God. “God has some kind of a plan for history,” Thiel said, while being interviewed by a pastor at a former church. “Maybe it’s a hidden plan; it’s a secret plan. He has a plan for your life.” It was a remarkable moment: One of the gods of Silicon Valley, who had long argued that technology could cure death, was now saying that there was one true God, and that human beings were human—limited, mortal, at the mercy of larger forces.

How certain Thiel is about the existence of God! But what is his evidence? And what is this evidence of a “plan for history” and a “plan for your life”?  Thiel is just making this stuff up, spinning his wheels.

6). Then in July, Elon Musk—the former “atheist hero,” the king of electric vehicles and space exploration, the champion of free expression—sat down with Jordan Peterson, the Canadian psychologist who has studied the intersection of religion and ideology, to discuss God. “I’m actually a big believer in the principles of Christianity,” Musk said. Soon after, Musk took to X to pronounce that “unless there is more bravery to stand up for what is fair and right, Christianity will perish.”

Note that Musk said he believes in the PRINCIPLES of Christianity, not the actual factual assertions of the faith. Do those beliefs include the principle that if you don’t except Jesus as your savior, you’re going to fry eternally? What about the principle that it’s okay to have slaves, so long as you don’t whip them too hard?

As for Jordan Peterson, what he believes about Christianity is so confused and incoherent that I cannot take his “religion” seriously.

There are more like this, includiong Paul Kingsnorth and Jordan Hall, but again, they are just conversion stories, and say nothing about the truth of Christianity. And for every believer cited I could dig up someone who either gave up faith or refused to adopt it, as shown by the growth of “nones” in America.  If it’s a war of anecdotes, the nonbelievers win (see below).

But we’ve neglected the prize specimen of conversion, former atheist Ayaan Hirsi Ali. She was deeply depressed, and nothing worked to help her. Until she found Christianity.

7.) In 2022, she started to come around to the idea of Christianity, going to church, thinking, reading: Who was this Christian God? And what was the nature of one’s relationship with him? How did that change you?

Then came Hamas’s attack on Israel on October 7, 2023.

The attack was proof, like the September 11, 2001 attacks in the United States, of everything she had long believed about Islam. She was horrified, but she was also amazed by the Israelis’ conviction. “What I find with my Jewish friends was this blind faith in Israel and the existence of Israel—there will be a Zionist movement, there will be a home for the Jewish people,” she said. “They are immersed in these biblical stories. It’s a story of faith.”

In November of that year, Hirsi Ali published an essay, “Why I Am Now a Christian”—a response to Bertrand Russell—in UnHerd. “We can’t counter Islamism with purely secular tools,” she wrote. “To win the hearts and minds of Muslims here in the West, we have to offer them something more than videos on TikTok.”

The essay triggered an avalanche of conversations in the independent media universe—including a book, which she is now working on, and a debate, in June, between Hirsi Ali and Dawkins in which she argued that Christianity is a bulwark against “the cult of power, Islamism.” The debate felt like a kind of bookend to the four horsemen meeting in Hitchens’s apartment in 2007.

Well, yes, Christianity could make you resist Islam (note that religion is being divisive here), and if it cured Hirsi Ali of her depression, then I won’t fault her for accepting it, so long as she believes its tenets, which she says she does.  Here’s the debate between Dawkins and Hirsi Ali. The audience is clearly on Hirsi Ali’s side, but the existence of God can’t be decided by a vote, and of course atheists are generally seen with suspicion compared to lauded “people of faith”. I have always found it curious that it’s considered praise to say someone is a “person of faith”.  It could just as well be said that that is a “person of delusion.”

Another argument for religion adduced in the piece is that religion inspired great art, including all the religious paintings before artists discovered apples and flowers, as well as cathedrals and great music.  This is in fact true, for surely we would have no Notre Dame or Chartres without Christianity. (I’m not so sure about music and painting.) But again, Islam too has inspired fantastic architecture as in their many lovely mosques (e.g., the Taj Mahal), as well as painting, and music (well, until recently). But again, none of this attesta to the verity of the revelations given to Muhammad.

And let’s get back to Dawkins:

Dawkins underscored that he, like Sam Harris, is still very much an atheist. He did not see any contradiction in saying, as he had to Rachel Johnson on the Leading Britain’s Conversation (LBC) radio show, that he was “happy” with the number of Christians declining in Britain and that he “would not be happy if we lost all our cathedrals and our beautiful parish churches.”

“The tendency you’re talking about,” he told me, alluding to Hirsi Ali, “is, I think, mostly people who don’t necessarily believe Jesus was the son of God or born of a virgin, or rose from the dead, but nevertheless think that Christianity is a good thing, that Christianity would benefit the world if more people believed it, that Christianity might be the sort of basis for a lot of what’s good about Western civilization.”

And yet, Dawkins did admit he was worried about losing the world that had been bequeathed to us by Christianity. “If we substituted any alternative religion,” he said in his April interview, “that would be truly dreadful.”

It wasn’t just about the danger of what was coming. It was about what we were losing, or might lose.

“Some of the greatest music ever written is church music, music inspired by Christianity,” he told me, echoing Roger Scruton. J.S. Bach would never have composed his Mass in B Minor—with all those violins, cellos, sopranos, and tenors weaving together, pointing us toward the heavens—without the divine, he said. Nor would Dostoevsky, as Paul Kingsnorth said, have written The Brothers Karamazov had he not been a believer. Had the world not been changed in countless unbelievable ways by that art? Had that art not changed us?

When I mentioned Dawkins’s distinction between cultural and theological Christianity to Kingsnorth, he said he thought Dawkins was deliberately sidestepping a deeper conversation about the nature of belief.

I can’t agree fully with Richard about Christianity having bequeathed us a world we want to live in. We can’t run the experiment, but what kind of world would we have if religion had never arisen? We wouldn’t have cathedrals, but perhaps rationality and science would have taken hold a lot earlier, and surely a lot fewer people would have died in the many religious wars. (They’re still dying in droves, by the way: Jew against Muslim, Sunni against Shia, and so on.)

All I know is that I can’t force myself to believe, to condition my life, on something like this unless I know it is true. And because I see no evidence for a God, much less for the truth of any religion, I cannot force myself to believe.  I consider myself a cultural Jew, but my life wouldn’t be that much poorer if I was purely secular.  It is very convenient that believers say they don’t need no stinkin’ evidence, for they get to believe and don’t have to explain why they believe beyond “it makes me feel good.” Like this, from Jonah Teller, a New York Catholic priest:

Father Jonah thought that a new fervor, a more authentic connection to the faith, was emerging out of the loneliness of the last few years. There was a “genuine happiness” that he could feel at Mass, “an excitement, a love.”

It wasn’t that complicated in the end. It was, he said, a kind of turning away from a radical atomization. “The world many people have grown up in is one in which you have the ability to be your own God,” said Father Jonah. “You should have it simply because you want it, whatever it may be. Or not have it, and that can include your own existence—a rejection of simply being.”

But the fact of our existence is a testament to God’s love for us, he said. “We are always wanted,” Father Jonah said. “We are always loved. This is the most important thing. God is not a mindfulness hack or a wellness exercise. It’s not—‘I found this ethical system that gets results, and therefore, I will choose it.’ It’s not a choice. It’s an encounter with an actual, personal love.”

Father Jonah’s evidence is this: we exist, therefore God, and not just God but the loving Christian god. Does God love the Covid virus and mosquitoes, too, which also exist?

I am not going to go into detail about how faith is declining throughout the West, but here are some data from the Gallup organization. Click each graph to see the report

x

 

From Pew Research:

and from Open Culture:

Look as you will, all you will find is a continuous decline in religion in America over the last 100 years.  But it’s not just America: read the Wikipedia article “Decline of Christianity in the Western World.”

This trend, of course, is downplayed in the article, with only a brief mention about the increase in “nones” under the Hirsi Ali section, but that’s about it.  Yet given this trend, in 200 years believers in America will be quite rare. Religion will never disappear, of course, but its decline has been discussed by Steve Pinker in his book Enlightenment Now. with religion adduced as an anti-Enlightenment force throughout history.

But why is the Free Press running pieces like this?  I have no idea, and can guess only that Bari Weiss, the editor, is herself religious, a believing Jew. I would love to hear her discuss the reasons for her faith, and why she rejects Christianity as a personal religion. But I haven’t seen that.

ONE MORE POINT:  To those who think that societies can’t function well without religion, I have a one-word response: Scandinavia.

Following successful early demonstrations of linking two quantum computing chips, IBM is aiming to break records for the largest quantum computer yet by combining many of them in parallel

Hartmut Neven, who leads Google's Quantum AI lab, wants to entangle our brains with quantum processors to test the idea that consciousness involves quantum phenomena

Exploring asteroids and other small bodies throughout the solar system has gotten increasingly popular, as their small gravity wells make them ideal candidates for resource extraction, enabling the expansion of life into the solar system. However, the technical challenges facing a mission to explore one are fraught – since they’re so small and variable, understanding how to land on one is even more so. A team from the University of Trieste in Italy has proposed a mission idea that could help solve that problem by using an ability most humans have but never think about.

Have you ever closed your eyes and tried to touch your fingers to one another? If you haven’t, try it now, and you’ll likely find that you can easily. It’s possible to do even without guidance from your five normal senses. That is what is known as proprioception – our hidden “sixth” sense. It is that ability to know where objects are in relation to one another – in this case, where your hands are in relation to one another without any other sensory indication.

Taking that basic idea and extrapolating it to a mission to an asteroid, the basic concept of the mission involves a lander with what seems like a dome with a ton of little balls on it, each facing a slightly different direction. Those balls are then ejected from the dome with varying degrees of force and land on various parts of the asteroid or comet.

Fraser discusses why swarms are becoming so central to our idea of space exploration.

They then create what is known in networking as a “mesh” system by connecting through one another and back to the main lander, which has a higher power output and larger communications array. They also contain a series of sensors, such as a camera, a magnetometer, and, importantly, an inertial measurement unit, or IMU.

IMUs are commonly used in cell phones to tell which direction the phone is oriented—that’s why your phone’s screen will flip upside down if you hold it upside down. They can also measure acceleration, which is why many are used in modern rocketry. They’re tiny and not very power-hungry, allowing them to fit into the ball format used for this mission.

Measurements from each of the remote sensors IMUs can be combined with data about the strength of the force that propelled them to their final resting place and fed into an algorithm, which will then help the base station determine the location of each sensor unit. That then allows measurements from the other sensors, such as the magnetometers and cameras, to paint a picture of the body’s external and internal structure – since magnetic fields, surface objects, and even gravity can vary significantly on small celestial bodies.

There are plenty of missions using swarms to explore asteroids – like the MIDEA project, as described here.
Credit – Cosmic Voyages YouTube Channel

As a proof of concept for this mission design, the team ran a simulation of a mission to comet 67P/Churyumov-Gerasimenko, most widely known for being visited by Rosetta, the ESA mission whose lander, Philae, experienced some of the trouble that is so common on these missions. They found that, depending on the number of projectile sensors, the mission could cover even weird morphologies like 67P/Churyumov-Gerasimenko’s two-lobed form. 

No agency has yet taken up the mission, but as electronics and sensors get smaller and more power efficient and more small bodies become potential resource sources, there might be a place for testing these spaced-out sensors. We’ll have to wait and see—just not with proprioception alone.

Learn More:
Cottiga et al. – Proprioceptive swarms for celestial body exploration
UT – Could You Find What A Lunar Crater Is Made Of By Shooting It?
UT – Swarming Satellites Could Autonomously Characterize an Asteroid
UT – Swarms of Orbiting Sensors Could Map An Asteroid’s Surface

Lead Image:
Depiction of the mission’s lander and deployable sensor system.
Credit – Cottiga et al.

The post Covering an Asteroid With Balls Could Characterize Its Interior appeared first on Universe Today.

Today we have some photos by UC Davis ecologist Susan Harrison. Susan’s captions and IDs are indented, and you can enlarge her photos by clicking on them.

A windy day at the coast

Looking back for any 2024 photos not sent to WEIT yet, I came across these ones from a couple of days in mid-October.  The tides were at their monthly low, and several of us inland-dwelling Californian birders drove out to Bodega Bay hoping to see mobs of shorebirds on the exposed mudflats.  Alas, the winds were gusting at 30 mph or more, and the birds were mostly either huddled in sheltered spots or blowing wildly past us across the bay.  We even saw a Peregrine Falcon (Falco peregrinus) sitting on the ground in a salt marsh, just waiting out the storm – too far away for a good photo, alas.

Last time we went to Bodega and encountered high winds, as some readers may remember, I gave up on real birds and did a photo essay on Alfred Hitchcock’s “The Birds” and its filming locations. This time we toughed it out and tried to photograph the huddling and swirling flocks.  Here are a few scenes.

Marbled Godwits (Limosa fedoa) hunkering down at the north end of the bay:

Godwit gang:

Marbled Godwits and Willets (Tringa semipalmata; black-and-white wings) billowing by:

Western Sandpipers (Calidris mauri) mixed with a Willet or two:

Black-bellied Plovers (Pluvialis squatarola) with their distinctive black armpits:

American Coots (Fulica americana), sheltering at a marina and then deciding the humans were too close:

Great Blue Heron (Ardea herodias) having a bad feather day:

Great Egret (Ardea alba), catching a rodent and then being pursued by another egret:

North American River Otters (Lontra canadensis), which despite their name are often seen in saltwater:

Textile fragments found in a 2800-year-old grave in the Netherlands were once part of a woven dress with a red and blue checked pattern, molecular analysis has revealed

The international community seems no closer to an agreement on a code for deep-sea mining in international waters and the impasse may lead to countries acting unilaterally