Category: 7. Science

  • Bees’ secret to learning may transform how robots recognize patterns

    Bees’ secret to learning may transform how robots recognize patterns

    A tiny brain no bigger than a sesame seed may hold the key to transforming artificial intelligence (AI) and robotics, thanks to groundbreaking research revealing how bees use their flight movements to enhance learning and recognition.

    Scientists at the University of Sheffield have uncovered that bees don’t just passively see the world – they actively shape their visual perception through body movements during flight.

    By building a computational model that mimics a bee’s brain, researchers have demonstrated how the insect’s unique flight patterns generate distinct neural signals, enabling it to identify complex visual patterns, such as flowers or even human faces, with remarkable accuracy.

    “In this study we’ve successfully demonstrated that even the tiniest of brains can leverage movement to perceive and understand the world around them,’ said Professor James Marshall, a senior author on the study.

    “This shows us that a small, efficient system – albeit the result of millions of years of evolution – can perform computations vastly more complex than we previously thought possible,” he added.

    A comparison to the previous experiment

    The current experiment is an upgrade on the team’s previous attempts to understand how bees use active vision to collect and process information.

    Their earlier experiment dealt with studying how bees fly around and inspect certain patterns, while the current one sheds light on the underlying brain mechanisms driving that behavior.

    “In our previous work, we were fascinated to discover that bees employ a clever scanning shortcut to solve visual puzzles. But that just told us what they do; for this study, we wanted to understand how,” said Dr. HaDi MaBouDi, a researcher at the University of Sheffield.

    “Our model of a bee’s brain demonstrates that its neural circuits are optimised to process visual information not in isolation, but through active interaction with its flight movements in the natural environment, supporting the theory that intelligence comes from how the brain, bodies, and the environment work together,” he continued.

    Does brain size matter for intelligence?

    This question has sparked the interest of scientists for ages. Professor Lars Chittka from the University of London finally answered this question, courtesy to this experiment.

    “Scientists have been fascinated by the question of whether brain size predicts intelligence in animals. But such speculations make no sense unless one knows the neural computations that underpin a given task,” he revealed.

    “Here we determine the minimum number of neurons required for difficult visual discrimination tasks and find that the numbers are staggeringly small, even for complex tasks such as human face recognition. Thus, insect microbrains are capable of advanced computations,” he stated.

    This study, a collaboration with Queen Mary University of London, was published in the journal eLife.

    Can bees show the future path of AI?

    Inspired by the agility and endurance of bees, researchers at MIT have developed robotic insects designed to assist artificial pollination – an innovation that could transform agriculture.

    Weighing less than a paperclip, these robotic insects can also perform double aerial flips and complete acrobatic maneuvers while flying.

    The main aim is to have these robotic insects perform precise pollination that can help farmers grow fruits and vegetables inside multilevel warehouses. This could also help boost yields and mitigate some of agriculture’s harmful effects on the environment.

    By studying insect brains and behavior, researchers uncover intelligence principles inspiring new technologies. Building on this, MIT’s robotic pollinators mimic natural flight to improve agriculture, showcasing how biology guides advancements in AI and robotics for real-world solutions.

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  • Citizen astronomers see moment star explodes by playing ‘spot the difference’

    Citizen astronomers see moment star explodes by playing ‘spot the difference’

    They managed to identify a cataclysmic variable star, named GOTO0650, which had undergone “extreme brightening” compared to an image taken just two days before.

    The results have been published in a paper in the scientific journal Astronomy and Astrophysics.

    Siding Springs Observatory was involved in the citizen science effort (Alamy/PA)

    A cataclysmic variable star is a binary star system made up of a white dwarf primary and a secondary star which are so close to each other that the gravity of the white dwarf distorts the second one.

    For the Kilonova Seekers project, members of the public are asked to compare data from two gravitational-wave optical transient observer (GOTO) telescopes – one in La Palma in the Canary Islands and the other at Australia’s Siding Spring Observatory.

    More than 3,500 people take part in the project from countries around the world.

    Professor Laura Nuttall, from the University of Portsmouth, said: “I’m really proud of everything Kilonova Seekers is achieving.

    “We’re engaging with people in just about every time zone, and thanks to their enthusiasm for the project, they are making discoveries and contributing to furthering our understanding of astrophysics.”

    Dr Lisa Kelsey, from the University of Cambridge, said: “Citizen science is a powerful way to make novel serendipitous discoveries in vast datasets that would normally need to be analysed in depth by scientists.

    “With over 2.8 million classifications so far, the discovery of GOTO0650 is really the pinnacle of two years of consistent hard work from our volunteers.

    “Without the Kilonova Seekers volunteers flagging this object, rapid follow-up would not have been possible, and this object may have been missed entirely.”

    Binary star system generating gravity waves.
    The team played ‘spot the difference’ to pinpoint the celestial event (Alamy/PA)

    Co-lead of Kilonova Seekers, Dr Tom Killestein, at the University of Warwick, said: “Kilonova Seekers is a unique opportunity for members of the public to take part in true real-time astrophysics.

    “Remarkably, public volunteers identified this star as an object of interest within three and a half hours of the image being taken by the GOTO telescopes – this discovery could have been missed among many other objects without their efforts.”

    Volunteer Cledison Marcos da Silva said: “This discovery was very important to me, as I was going through a serious health problem and the citizen science we do at Kilonova Seekers was distracting me from my situation.

    “I never imagined that we would discover such a bright transient, so it was a huge surprise, and we were very happy when we found out.

    “This discovery shows the importance of citizen science, both scientifically and personally. Even from your bed, or on the street with your cell phone, there is the possibility of making a very important discovery.”

    Another participant Mayahuel Torres-Guerrero said: “It was very exciting when GOTO0650 produced an echo outburst on Christmas Day and New Year’s Day. It was a great journey for someone who has studied social sciences like me.”


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  • Virtual melting accompanies shear-induced crystal transitions – Physics World

    Virtual melting accompanies shear-induced crystal transitions – Physics World

    An international team of researchers have observed a phenomenon called virtual melting in colloidal crystals. They studied how it helps enable changes from one crystalline structure to another

     

    Virtual melting can occur in a range of materials from ice to metals. (Courtesy: iStock/ninikas)

    Shear-induced structural transitions happen when the structure of a material changes due to the application of force. It’s a phenomenon observed in various systems, including metals like aluminium and iron, molecular crystals such as ice and quartz, and even the Earth’s mantle.

    A better understanding of how it works could lead to an improvement in the processing and fabrication of materials with more control on defect formation.

    Measuring microscopic processes like this is usually challenging because electron microscopy cannot resolve individual atoms’ motions in bulk solids, and the strong shear force makes things especially difficult.

    Here, the researchers used colloidal crystals, allowing them to observe transitions at the single-particle level. As a soft material (one that can easily be deformed), colloid crystals are particularly well-suited for this type of study.

    They found that under certain conditions, a liquid layer formed around the growing new crystal structure. This phenomenon is known as “virtual melting” because it occurs well below the effective melting temperature. This liquid layer facilitates the transition by reducing the strain energy at the interface between the old and new crystal structures.

    Virtual melting has been proposed in theory and simulation, but had never been directly observed in experiments before. The team’s results not only represent the first experimental observation of this process but also help us to better understand under what circumstances it takes place.

    The study has potential applications across various fields, including metallurgy, materials science, and geophysics. The concept of virtual melting could also provide new a new way of thinking about stress relaxation and phase transitions in other systems.

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  • Measuring the speed of sound in quark–gluon plasmas at CERN – Physics World

    Measuring the speed of sound in quark–gluon plasmas at CERN – Physics World

    Scientists from the CMS collaboration at CERN have measured the speed of sound in the quark-gluon plasmas with record precision, a key step to understanding how matter behaved in the very early Universe

    Compact Muon Solenoid The CMS detector at CERN has gleaned important information about quark–gluon plasma. (Courtesy: CERN)

    Protons and neutrons in atomic nuclei are themselves made up of fundamental particles known as quarks. These quarks are held together by the strong interaction via force carriers called gluons.

    When heavy atomic nuclei collide at high energies close to the speed of light, these constituent particles can break free from each other. The resulting substance, called a quark–gluon plasma, exhibits collective flowlike behaviour much like an everyday liquid.  Unlike a normal viscous liquid however, these near-perfect fluids lose very little energy as they flow.

    Researchers are very interested quark–gluon plasmas because they filled the entire Universe just after the Big Bang before matter as we know it was created.

    The CMS Collaboration of scientists at CERN routinely create this state of matter for a very brief moment by colliding large nuclei with each other.  In this paper, the researchers used sound waves as a way of understanding the plasma’s fundamental properties.

    Sound is a longitudinal wave that produces compressions and rarefactions of matter in the same direction as its movement. The speed of these waves depends on the medium’s properties, such as its density and viscosity. It can, therefore, be used as a probe of the medium.

    The team were able to show that the speed of sound in their quark–gluon plasma was nearly half the speed of light – a measurement they made with record precision compared to previous studies.

    The results will help test our theories of the fundamental forces that hold matter together, allowing us to better understand matter in the very early Universe as well as future results at particle colliders.

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  • Ocean salinity shifts are melting Antarctic sea ice faster, scientists find

    Ocean salinity shifts are melting Antarctic sea ice faster, scientists find

    Rising salt levels near Antarctica are altering ocean dynamics, drawing up warm water and accelerating sea ice loss, new satellite data reveal.

    Sachi Kitajima Mulkey reports for The New York Times.


    In short:

    • A new study finds increasing ocean salinity near Antarctica is driving warmer water to the surface, which speeds sea ice melt and hinders winter ice formation.
    • The research, published in Proceedings of the National Academy of Sciences, used advanced satellite algorithms and ocean buoy data to detect changes in water salinity over the past decade.
    • Scientists warn the shift may mark a long-term transition in Antarctic ice behavior, with the feedback loop between melting, warming, and salt levels posing broad climate risks.

    Key quote:

    “We are entering a new system, a new world.”

    — Alessandro Silvano, senior scientist at the University of Southampton

    Why this matters:

    Sea ice acts as the planet’s reflective shield, bouncing solar radiation back into space and helping to regulate Earth’s temperature. The loss of Antarctic sea ice not only exposes darker ocean water that absorbs more heat but also disrupts global ocean currents and weather systems. Rising salinity near Antarctica hints at a larger, destabilizing feedback loop: Warmer waters melt more ice, which then reinforces ocean mixing and heat absorption. This shift threatens to reshape sea level patterns and intensify extreme weather across the globe. As the climate warms, monitoring Antarctic changes becomes increasingly urgent, but recent U.S. cuts to satellite data programs could leave scientists with fewer tools to track these tipping points.

    Read more: Melting ice and microplastics signal deepening disruption in Antarctica’s climate system

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  • New satellite ‘vital’ for future weather forecasts | Met Office

    New satellite ‘vital’ for future weather forecasts | Met Office

    he first ever geostationary satellite to provide 3D profiles for temperature and humidity for Europe launched yesterday [1 July], in the latest phase of a multi-year project to transform weather forecasting and climate monitoring.

    The Meteosat Third Generation Sounder (MTG-S1) will be the first ever European sounding satellite in geostationary orbit, joining the imager satellite which launched in 2022 and is now the primary imaging satellite for Europe and providing data to European meteorological organisations, including the Met Office.

    The launch, organised by EUMETSAT, will put MTG-S1 into orbit focused on Europe and will provide data to enhance the next generation of weather forecasts. It’s the second satellite as part of a series of six which will revolutionise and safeguard weather forecasting across Europe for the next 20 years.

    Met Office, Managing Director of Products and Services Simon Brown is present at the launch and is part of the team that represents the Met Office within EUMETSAT. Speaking ahead of the launch, he yesterday said:

    “Our vision is to be the most trusted for weather and climate intelligence and, once available, the more frequent and more detailed satellite data will be assimilated into calculations run on our new supercomputer, providing an extra layer of data to Met Office forecasts to further improve accuracy.

    “The MTG mission is a hugely important project, not just for us at the Met Office, but also for forecasters and meteorologists across Europe. This international collaboration is vital in ensuring that recent improvements to forecast accuracy can be safeguarded and enhanced in the coming years.”

    MTG-S1 includes an infrared sounder, which will provide the first ever regular 3D profiles for temperature and humidity, adding more data for meteorologists to work with, as well as to be embedded in numerical weather predictions.

    Satellite data is the largest contributor to numerical weather prediction accuracy and the ongoing project will both safeguard existing performance, as well as accelerate improvements in the coming years. The space-to-ground profiles will enable more complex calculations and aid understanding of the competing factors at play in the Earth’s atmosphere.

    The Infrared Sounder scans Europe every 30 minutes, providing near-real time observations for meteorologists in a marked shift from existing sounder observations, which come from low-earth orbit satellites typically only revisiting Europe a few times a day.

    The enhanced detail and frequency of data is crucial to forecasters, according to Met Office Head of Space Applications and Nowcasting R&D Simon Keogh. He yesterday said:

    “The infrared sounder represents a marked step-change in data availability for forecasters in Europe.

    “The data will further enhance our nowcasting capabilities, which is the forecasting of impactful convective systems at short ranges. Coupled with the imaging satellite that is now providing data, the sounding satellite will allow meteorologists to make more detailed, timely and accurate assessments of the atmosphere prior to severe convective rainfall and thunderstorms, which can be responsible for impactful weather, including flash floods.”

    MTG instruments

    The satellite also hosts the Copernicus Sentinel-4 mission, by carrying an Ultraviolet, Visible and Near-Infrared spectrometer which will be used for long-term climate monitoring, and which captures data every hour to monitor air quality and pollution over Europe and North Africa.

    Harshbir Sangha, Director of Missions and Capabilities at the UK Space Agency, said:

    “The data from Sentinel 4 will be pivotal for the UK’s Earth observation sector, particularly users of the Copernicus Atmosphere Monitoring Service, by allowing rapid, hourly forecasting on air quality and pollution.

    “We are proud to acknowledge the UK’s critical role in the instrument’s development, with essential characterisation and calibration phases carried out at the RAL Space’s test facility, ensuring Sentinel‑4 meets the exacting standards necessary to support timely, policy-relevant air quality services.”

    MTG-S1

    A live feed of the launch is available online. This link will close at the conclusion of the launch.

    Phil Evans, Director-General of EUMETSAT, said:

    “MTG-S1 will provide entirely new types of data products that will support specialists across EUMETSAT member states to detect signs of atmospheric instability even before clouds begin to form. Combined with data from the MTG imaging satellites it will, for the first time, offer a space-based view of the full lifecycle of convective storms. This will provide tremendous support to national meteorological services in carrying out their vital work, helping to save lives, reduce disruption, and strengthen resilience.

    “The effects of the climate crisis are not distant threats: they are already being felt across Europe – through more frequent storms, longer heatwaves, and shifting climate patterns. MTG-S1 will support more timely warnings, safer travel decisions, more effective emergency response, and support informed action.

    “My sincere thanks go to everyone who made MTG-S1 possible – our teams at EUMETSAT, our member states, the European Union, the European Space Agency, national meteorological services, and all our industrial and academic partners. This successful launch is a testament to the strength of European cooperation. We now move to the next phases and preparing the satellite for full operations.”

    Post launch, it will take around a year for the first data to be available from the satellite, with further quality assurance tests needed before the new data can be routinely used by meteorologists in Europe.

    The next launch in this series, led by EUMETSAT and ESA, is expected in 2026, with a further imaging satellite.

     

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  • First Ever ‘Double Supernova’ Found In Night Sky — What To Know

    First Ever ‘Double Supernova’ Found In Night Sky — What To Know

    Astronomers studying the night sky from the Southern Hemisphere have uncovered a supernova — the powerful explosion of a star — that appears to detonated twice. The unique discovery of the double-detonation supernova comes as two smaller nova explosions have caused stars to suddenly become visible to the naked eye.

    A supernova, according to NASA, is an extremely bright, super-powerful explosion of a star and the biggest explosion that humans have ever seen. Astronomers uncovered the rare double-detonation supernova by studying a “cosmic bubble” — known as a supernova remnant — called SNR 0509-67.5. It’s 23 light-years across and expanding at over 11 million miles per hour. It’s previously been imaged by NASA’s Hubble Space Telescope.

    SNR 0509-67.5 is in the Large Magellanic Cloud, a dwarf galaxy that orbits the Milky Way about 160,000 light-years distant in the constellation Dorado. SNR 0509-67.5 is Type Ia supernovae, which are known to produce iron on Earth, including in blood. Understanding these explosions of white dwarf stars is critical to astronomers who use them to measure distances in space.

    How A Supernova Exploded Twice

    SNR 0509-67.5 is a Type Ia supernova, the result of two stars orbiting each other. One, a white dwarf star — the dense core of a dead sun-like star — sucks matter onto its surface from the other star until a thermonuclear explosion occurs. The new discovery of a double-detonation supports the theory that, in at least some Type Ia supernovae, the white dwarf can be covered by a bubble of helium that, when it ignites, causes a shockwave that triggers a second detonation in the core of the star.

    Astronomers predicted that if a double detonation had occurred, the remnant of the supernova would contain two separate shells of calcium. That’s exactly what was observed using the European Southern Observatory’s Very Large Telescope in Chile. The discovery was published today in Nature Astronomy.

    Hubble Spots A Supernova

    Earlier this year, NASA’s Hubble Space Telescope imaged a supernova about 600 million light-years away in the constellation Gemini. Visible as a blue dot at the center of the image above, supernova SN 2022aajn is also a Type Ia supernova. Exactly these types of supernovae are useful for astronomers because they all have the same intrinsic luminosity. That means they can be used as beacons to measure the distance to faraway galaxies.

    ForbesA ‘New Star’ Suddenly Got 3 Million Times Brighter — How To See It

    Background

    Although they fall into the category of smaller explosions called a nova, two exploding stars are currently visible in the night sky. V572 Velorum, in the constellation Vela and V462 Lupi, in the constellation Lupus — only visible from the Southern Hemisphere — are currently shining millions of times brighter than usual.

    Later this year or next year, if predictions are correct, a star in the Northern Hemisphere called T Coronae Borealis (T CrB and “Blaze Star”) in the constellation Corona Borealis will explode and become visible to the naked eye for several nights. This star system, about 3,000 light-years away, is a recurrent nova, meaning it experiences predictable eruptions. The last time T CrB brightened noticeably was in 1946.

    Wishing you clear skies and wide eyes.

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  • Paralogous Genes Decoded With Paraphase Tool

    Paralogous Genes Decoded With Paraphase Tool


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    Many medically relevant genes reside in “dark regions” of the genome that have long been elusive. To address this, we developed Paraphase – a computational tool that accurately resolves and analyzes paralogous genes. By unlocking the difficult-to-analyze regions of the genome where paralogous genes reside, Paraphase provides deeper insights into genetic variation, disease mechanisms and population diversity. This knowledge helps lay the groundwork for improved diagnostics, more inclusive reference genomes and future discoveries in genomic medicine. This multi-institutional study, led by PacBio, was published in Nature Communications.

    Shedding light on the genome’s dark regions

    We wanted to overcome a longstanding challenge in genomics: highly similar paralogous genes. These genes often reside within segmental duplications (SDs), which are large, repeated regions of DNA with nearly identical sequences. The repetitiveness of SDs complicates variant calling and copy number analysis, meaning traditional short-read sequencing technologies struggle to resolve these regions, leaving many genomic regions understudied and conditions undiagnosed.


    To further our mission of accurately analyzing previously “dark” regions of the genome, we decided to design a tool for precise phasing and analysis of SDs with high accuracy and throughput. We also wanted to examine how copy number variations (CNVs) in certain paralogous genes differ across ancestries, and to show how this affects disease risk for different populations of people. We wanted to prove further how understanding genetic diversity such as copy numbers is key for building inclusive reference genomes and advancing equitable genomic medicine.

    Paraphase uncovers genetic variations in segmental duplications in global populations

    We developed a computational tool, Paraphase, to resolve segmental duplications (SDs) and allow us to accurately assess paralogs and copy numbers.


    Before applying Paraphase to new data, we first validated the tool by applying it to known positive pathogenic samples and confirmed its accuracy. We then extended our analysis to 160 SD regions, spanning 316 genes. Samples came from 259 individuals across 5 ancestral groups: South Asian, European, African, Latin American and East Asian; the goal was to identify patterns of population-specific diversity and potential reference genome errors. Additionally, we examined 36 parent–offspring trios to detect de novo variants and gene conversion events.


    The key findings of the study were:

    • Paraphase enabled the analysis of medically important genes and associated diseases, such as those implicated in spinal muscular atrophy (SMN1/SMN2) and congenital adrenal hyperplasia (CYP21A2).
    • We observed high copy number variability in many gene families within segmental duplications across people of different ancestries.
    • We discovered a new approach for identifying false duplications in the reference genome.
    • We identified 23 paralog groups with exceptionally low genetic diversity between genes and paralogs, indicating that frequent gene conversion and unequal crossing-over may contribute to similar gene copies.

    Diverse genomic insights improve disease research and diagnosis

    Our study demonstrates that using long-read HiFi sequencing in conjunction with our computational tool, Paraphase, provides a much richer and more detailed picture of genetic variation, specifically in complex SDs. By improving our ability to call disease-linked variants that are often missed by other technologies, Paraphase opens up new avenues for disease research.


    For example, using Paraphase, we disentangled medically important gene families in a single test that have previously required specialized, multi-step assays. In the CYP21A2/CYP21A1P region – where mutations cause congenital adrenal hyperplasia – we characterized a previously overlooked duplication allele carrying both a functional CYP21A2 copy and a nonfunctional CYP21A2(Q319X) copy. Using standard tests, this duplication allele could easily have been misclassified.


    Our study further highlights the power of long-read sequencing in detecting de novo variations, particularly in previously inaccessible parts of the genome. We uncovered seven previously undetected de novo single nucleotide variants (SNVs) and four de novo gene conversion events, two of which were non-allelic – a level of detail not possible with traditional sequencing approaches.


    Additionally, our approach revealed high variation in copy number distributions across paralog groups in different ancestries. This finding reinforces the need for more genetically diverse reference genomes, as current references genomes are often biased toward European populations.


    Paraphase provides a method for studying paralogous genes at scale, offering new opportunities for disease research, population-wide analysis and potentially even clinical testing. By broadening our understanding of genetic variation across ancestries, we can better understand how certain diseases impact specific populations, paving the way for more targeted diagnoses and treatment approaches.


    By enabling more accurate identification of de novo variants and gene conversion events, our approach provides deeper insights into how genetic disorders arise and how traits are inherited. These discoveries offer a clearer view of genetic inheritance patterns and help reveal the underlying mechanisms of disease.

    It should be noted that the current study focuses exclusively on gene families with fewer than 10 genes. Larger and more complex gene families were not included, meaning some medically important regions have yet to be studied. Additionally, the study is limited to assessing DNA-level variation in paralogs and does not explore transcriptomic or epigenetic factors, such as RNA expression or methylation differences between gene copies.

    A broader lens: From genomics to multiomics

    Looking ahead, we would like to extend Paraphase to study larger gene families, which were excluded from the current study. We’re also interested in applying Paraphase to investigate RNA-level differences and the transcriptional activity of paralogs that are very similar in sequence. It would be beneficial to explore epigenetic regulation with Paraphase, as it could provide further insights into how paralogous genes are controlled and expressed.


    Reference: Chen X, Baker D, Dolzhenko E, et al. Genome-wide profiling of highly similar paralogous genes using HiFi sequencing. Nat Commun. 2025;16(1):2340. doi:10.1038/s41467-025-57505-2 

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  • Researchers study interactions between light and heavy electrons in twisted trilayer graphene

    In systems with multiple energy bands, the interplay between electrons with different effective masses drives correlated phenomena that do not occur in single-band systems. Magic-angle twisted trilayer graphene is a tunable platform for exploring such effects, hosting both heavy (“bound”) electrons and light (“weakly bound and mobile”) electrons. 

    Researchers at Harvard, MIT and National Institute for Material Science in Japan have examined the interplay between “light” and “heavy” electrons in magic-angle twisted trilayer graphene, shedding new light on how they may help form novel quantum states.

     

    “Before our work, people could only ask ‘What is the overall ground state’?” said Andrew T. Pierce, one of the paper’s lead authors. Pierce, currently a fellow at Cornell University, was a graduate student in Amir Yacoby’s lab at Harvard when they began to study this question. What wasn’t clear was the true nature of these different states and how the separate light and heavy electrons joined forces to form them.

    Additionally, because of the more obvious role of heavy electrons to drive insulators, light electrons have often been dismissed as “doing nothing” or “being spectators,” said Yonglong Xie, one of the paper’s lead authors. A former Harvard Quantum Initiative Prize postdoctoral fellow in Yacoby’s lab, Xie, now an assistant professor at Rice University, noted that the effect of these light electrons on the overall system was hard to detect.

    The interplay between electrons with different masses is believed to drive intricate quantum phenomena. In the novel material known as magic-angle twisted trilayer graphene (MATTG), where three layers of graphene are stacked together with the middle sheet rotated slightly, electrons with small and large masses coexist. This material supports a plethora of exotic quantum phenomena including superconductivity (i.e. electrical conduction without heating), thereby providing a new setting to address this question.

    To understand what was going on in these cases, the researchers used a specialized form of microscopy, known as scanning single-electron transistor (scanning SET), pioneered by Yacoby, to examine tiny “puddles” in the MATTG where electrons are trapped when the MATTG enters an insulating state. The scanning SET indicated that while the heavy electrons enable insulating states, the light electrons remain mobile, suggesting that they should participate in forming the novel states, including superconductivity.

    “The heavy electrons form an insulator among themselves, creating the illusion of an overall insulating state, but in reality the light electrons remain free,” clarified Pierce. “This raises the possibility that the light electrons can mediate interactions between heavy electrons.”

    This surprising finding underscores how complex the interplay between light and heavy electrons in MATTG can be, the researchers said. They suggested that exploring further methods of “tuning” the ratio of heavy and light electrons in two-dimensional materials will lead to exciting new discoveries. “The problem of coexisting light and heavy electrons in solids is a long-standing one, and we hope our scheme for disentangling their roles gives a new approach to these intriguing materials,” said Pierce.

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  • Second ‘Nova’ Explodes In Night Sky In Extremely Rare Event

    Second ‘Nova’ Explodes In Night Sky In Extremely Rare Event

    Topline

    Just days after a nova appeared in the night sky, another joined it. V572 Velorum, in the constellation Vela, joins V462 Lupi in Lupus. Both are now visible to the naked eye to observers in the Southern Hemisphere and are currently shining millions of times brighter than usual. The remarkable coincidence — judged to be extremely rare by astronomers — has occurred as astronomers await the explosion of T Coronae Borealis (T CrB) in Corona Borealis, which is known to explode and shine brightly every 80 years or so.

    Key Facts

    A nova is a sudden, short-lived explosion from a compact star not much larger than Earth, according to NASA. Nova is Latin for new.

    V572 Velorum is currently shining at magnitude +4.8 and V462 Lupi at magnitude +5.9, both within reach of the naked eye.

    V572 Velorum was discovered on June 25 by astrophysicist John Seach in Grafton, New South Wales, Australia. “The nova has risen to magnitude 4.9 and is a naked-eye object,” wrote Seach on X (Twitter). “This is my 12th nova discovery and the first in 7.5 years.”

    The star has become dramatically brighter since it exploded. According to astronomers in the U.K. and Poland, the star is usually magnitude +16.65, so it is currently shining 55,000 times brighter than usual.

    V572 Velorum has since been studied by astronomers using the Fermi Gamma-ray Space Telescope, which orbits Earth. It confirmed that, as expected, the nova unleashed gamma rays, the most energetic form of light.

    How Rare Are Nova Explosions?

    Astronomers estimate that between 20 and 50 novae occur each year in our galaxy, but most go undiscovered, according to NASA. Very few — typically zero — are visible to the naked eye. For two to appear at once is unprecedented. “This is without question an extremely rare event,” said Stephen O’Meara, an American astronomer, to Spaceweather.com. “I have yet to find an occurrence of two simultaneous nova appearing at the same time.”

    Why V572 Velorum Is Getting Brighter

    It’s thought that both V572 Velorum and V462 Lupi are both classical novas. A classical nova occurs when a white dwarf — the dense core of a collapsed sun-like star — is orbited by a larger star. According to NASA, the white dwarf’s gravity pulls hot hydrogen from its companion, which builds up and triggers a thermonuclear blast. Unlike supernovas, which obliterate stars, novas are recurring events that only affect the outer layer of a white dwarf. These outbursts can make the system millions of times brighter.

    Novas Create Lithium (and The Solar System)

    Lithium is used to make lithium batteries and lithium-ion batteries, as well as heat-resistant glass and ceramics and mood-altering chemicals. Most of the lithium in our solar system and the wider Milky Way galaxy comes from classical nova explosions like V572 Velorum and V462 Lupi, according to a paper published in 2020. The same researchers previously discovered that novas contributed to the molecular cloud that formed the solar system.

    Further Reading

    ForbesA ‘New Star’ Suddenly Got 3 Million Times Brighter — How To See ItForbesA New Star Will Soon Appear — What To Know About T Coronae BorealisForbesSee The First Jaw-Dropping Space Photos From Humanity’s Biggest-Ever Camera

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