Category: science

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New Study Confirms Nebra Sky Disc’s Ancient Origins and Advanced Craftsmanship

A recent study has provided crucial insights into the manufacturing techniques used to create the Nebra Sky Disc, an artefact thought to date back 3,800 years to the Early Bronze Age. The analysis challenges claims suggesting the disc could be a modern forgery. Researchers revealed that the disc was crafted through an elaborate “hot forging” process, involving at least ten heating and hammering cycles at temperatures exceeding 700°C, according to Christian-Heinrich Wunderlich, a metallurgist cited by Live Science.

Discovery and Ongoing Debate

The study was published in Scientific Reports on November 21. Unearthed in 1999 near Nebra, Germany, the 12-inch bronze disc, adorned with gold symbols thought to represent celestial bodies, has been the subject of considerable debate. Initial reports lauded it as the oldest known depiction of the sky. However, questions regarding its authenticity arose, including theories suggesting its discovery site might have been staged to enhance its market value.

Experts involved in the study recreated a replica using Early Bronze Age techniques, reportedly. The metallographic comparison between the replica and the original disc identified crystal structures in the bronze consistent with ancient hot forging methods. Wunderlich in a statement to LiveScience said that the copper used in the disc was traced to a specific Austrian mine active during the Early Bronze Age but no longer operational in subsequent eras. This finding undermines suggestions that the artefact might be significantly younger.

Symbolism and Craftsmanship

The disc combines bronze with gold elements using a technique known as damascening. Harald Meller, state archaeologist of Saxony-Anhalt, emphasised in his statement that the advanced metalworking skills evident in its construction. The gold inlays, possibly depicting the sun, moon, stars, and other celestial elements, have been interpreted as an early astronomical chart.

The artefact remains on display at the Saxony-Anhalt State Museum of Prehistory, celebrated for its historical significance. While disputes surrounding its origins continue, recent findings provide strong evidence supporting its Bronze Age provenance.

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Google Willow: All You Need to Know About the Quantum Processor That Outperforms World’s Best Supercomputer

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Google Willow: All You Need to Know About the Quantum Processor That Outperforms World’s Best Supercomputer

A recent study published in Nature has detailed a major achievement by Google’s Quantum AI team. Their latest quantum processor, named “Willow,” solved a computational problem in five minutes that would have taken the world’s most advanced supercomputer an estimated 10 septillion years. This achievement marks significant progress in overcoming one of the greatest challenges in quantum computing — reducing errors as the machines scale.

Breakthrough in Quantum Error Correction

Quantum computers are known for their high error rates, where approximately one in 1,000 qubits fail during calculations. In comparison, traditional computers experience failures in only one out of a billion billion bits. This discrepancy has made error-correction methods critical for advancing the technology. The Willow processor, which contains 105 physical qubits, employs error-correcting technologies that reduce inaccuracies as more qubits are added, an achievement first theorised by computer scientist Peter Shor in 1995.

Google Quantum AI’s Julian Kelly, director of quantum hardware, told Live Science that the team’s focus has been on achieving a state where fewer errors are introduced than are corrected. The Willow processor’s design integrates physical qubits into “logical qubits,” enabling calculations to proceed even if individual qubits fail.

Through advancements in machine learning, device fabrication, and calibration techniques, the team reported coherence times of up to 100 microseconds — five times better than their previous Sycamore processor, the researchers stated in the study.

Path to Practical Applications

The team’s immediate goal is to construct a logical qubit with an error rate of one in a million, requiring 1,457 physical qubits. Once achieved, their efforts will shift towards connecting multiple logical qubits to solve real-world problems. While the Willow processor has demonstrated exponential error reduction, scientists aim to move beyond benchmarks and focus on practical computations that extend the capabilities of quantum machines.

This progress, as highlighted in the study and expert discussions, indicates a path forward for quantum computing to outperform classical systems in diverse applications.

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Arecibo Observatory Data Helps SETI Uncover Secrets of Pulsar Signals and Cosmic Distortions

Years after the collapse of the Arecibo Observatory, its extensive datasets remain instrumental in advancing astronomical research. In a study led by Sofia Sheikh from the Search for Extraterrestrial Intelligence (SETI) Institute, data from the observatory was utilised to uncover new details about pulsar signals. These dense neutron stars emit beams of radiation likened to “cosmic lighthouses,” and their signals undergo distortions as they traverse the interstellar medium. Findings from this research were published in The Astrophysical Journal on November 26.

Pulsar Signals and Interstellar Scintillation

The study explored how pulsar signals are affected by interstellar gas and dust. Researchers investigated 23 pulsars, including six previously unstudied, revealing insights into distortive phenomena called diffractive interstellar scintillation (DISS). This phenomenon, which resembles the rippling patterns caused by light passing through water, is attributed to interactions between pulsar signals and charged particles in space.

The Role of Arecibo’s Archival Data

The now-defunct Arecibo radio telescope, once spanning 305 metres, collapsed in December 2020 due to cable failures. Despite its destruction, the data collected over decades continues to contribute significantly to astrophysical discoveries. It was revealed by researchers that pulsar signals exhibit broader bandwidths than predicted by current interstellar models. This discrepancy indicates a need to refine existing frameworks, particularly by incorporating the structural complexity of the Milky Way.

Implications for Gravitational Wave Studies

Reportedly, a better understanding of pulsar signal distortions could enhance projects like the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), which employs pulsar timing arrays to detect space-time distortions caused by gravitational waves. The recent identification of the gravitational wave background, potentially originating from supermassive black hole mergers, underscores the relevance of such advancements.

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Asteroids Impacting Neutron Stars May Be the Cause of Fast Radio Bursts

In a study in The Astrophysical Journal, it has been proposed that fast radio bursts (FRBs), enigmatic blasts of radio waves detected from deep space, could originate from the collision of asteroids with neutron stars. According to reports, these collisions release immense energy—sufficient to power humanity for 100 million years. The findings align with observations of FRBs and suggest a potential mechanism behind their creation.

FRBs are characterised by their brief duration, ranging from milliseconds to a few seconds, during which they emit as much energy as the Sun does over several days. Since their discovery in 2007, their origins have remained elusive. As per sources, the detection rate of these phenomena increased significantly in 2017 with the Canadian Hydrogen Intensity Mapping Experiment (CHIME).

Energy Generated by Asteroid Impacts on Neutron Stars

Neutron stars, remnants of massive stars, are known for their extreme density and powerful magnetic fields. Dr Matthew Hopkins, an astrophysicist at Oxford University, explained to Space.com that the gravitational force and magnetic energy of neutron stars contribute to the release of colossal energy when impacted by asteroids. For an asteroid roughly one kilometre in size, energy equivalent to 10^29 joules may be released, comparable to 100 million years of global energy consumption.

Frequency and Distribution of Collisions Across Galaxies

Dr Dang Pham, the study’s lead author and a researcher at the University of Toronto, noted in a statement that interstellar objects such as asteroids and comets are abundant enough to account for observed FRB rates. Speaking to Space.com, Dr Pham stated that the estimated rate of neutron star-asteroid collisions aligns with the current FRB detection frequency.

Implications for Repeating FRBs

However, the study acknowledges that these collisions are unlikely to explain repeating FRBs, which occur more frequently. Researchers suggest that repeated bursts may stem from collisions involving asteroid belts or other celestial phenomena, a hypothesis that remains under investigation.

Further observations through projects like CHIME and the Australian Square Kilometre Array Pathfinder are expected to refine understanding of FRB origins and their connection to interstellar events.

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Scientists Discover First Astrosphere Around Sunlike Star: What You Need to Know?

Astronomers have detected an astrosphere around a star resembling the Sun, marking a significant milestone in understanding stellar evolution. This finding, shared during the 25 Years of Science with Chandra symposium on December 3, 2024, provides a rare view into the early conditions of stars like the Sun. An astrosphere, described as a bubble of ionised gas formed by stellar wind, acts as a protective shell around stars. The discovery has shed light on how these structures are formed and their role in shielding planetary systems from cosmic radiation.

What Defines an Astrosphere?

Astrospheres are created by a star’s stellar wind, a continuous stream of charged particles. For instance, the Sun’s heliosphere serves as an example, extending beyond Pluto and safeguarding the solar system from cosmic rays. Despite extensive research, such phenomena had not been observed around stars with characteristics similar to the Sun. As per reports, Carey Lisse, a researcher at Johns Hopkins Applied Physics Laboratory, noted in an interview with a prominent science publication that the detection of astrospheres around average stars has been elusive for over two decades.

Key Target: HD 61005, Known as “The Moth”

The star HD 61005, dubbed “The Moth” for its distinctive wing-like dust disk, became the focus of this investigation. Its rapid movement through a dense interstellar gas cloud at approximately 10 kilometres per second has resulted in the unique shape of its surrounding disk. According to sources, HD 61005, which mirrors the size and mass of the Sun, was chosen for its youthful stage at 100 million years old. Young stars like this typically emit stronger stellar winds, providing ideal conditions for studying astrospheres.

X-ray Data Unveil Unexpected Details

Observations captured by NASA’s Chandra X-ray Observatory revealed a halo of X-rays encasing HD 61005. This structure extends nearly 100 times farther than the Sun’s heliosphere. Contrary to expectations, the astrosphere displayed a spherical shape, suggesting the star’s intense wind counteracts external pressures.

Insights into Solar Evolution

The findings are believed to offer clues about the early behaviour of the Sun and its protective influences on the young Earth. Understanding such phenomena could also aid in evaluating the habitability of planets orbiting stars with similar properties. The study represents a leap in comprehending the protective role of astrospheres across stellar systems.

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Study Finds Venus Likely Never Had Oceans, Challenging Past Theories

A recent study published in Nature Astronomy has concluded that Venus likely never had oceans or conditions conducive to life. The research, led by Tereza Constantinou, a doctoral researcher at the University of Cambridge’s Institute of Astronomy, analysed the planet’s atmospheric composition to infer its interior water content. The findings suggest that Venus’s interior is substantially dry, supporting the idea that the planet remained parched throughout its history. These conclusions challenge earlier theories suggesting Venus may have once held liquid water.

Key Indicators of a Dry Interior

As per reports, Venus’s atmospheric chemistry was a focal point of the study. Volcanism on Earth releases gases that are more than 60 percent water vapour, reflecting a water-rich mantle. In contrast, volcanic eruptions on Venus emit gases with no more than 6 percent water vapour. This stark difference indicates a dry interior, suggesting that Venus’s surface conditions were never capable of sustaining liquid water.

In a statement to Reuters, Constantinou explained that the atmospheric chemistry suggests that volcanic eruptions on Venus release very little water, implying that the planet’s interior—the source of volcanism—is equally dry.

Diverging Evolution of Sister Planets

Venus and Earth share many physical similarities, including size and composition. However, their evolutionary trajectories have diverged significantly. As per sources, Venus experiences extreme surface temperatures of approximately 465 degrees Celsius, atmospheric pressure 90 times greater than Earth’s, and sulphuric acid clouds in its toxic atmosphere. Constantinou highlighted these contrasts, stating that such conditions underscore the challenges in studying Venus’s history of habitability.

Future Exploration Plans

Upcoming missions aim to enhance understanding of Venus. NASA’s DAVINCI mission, scheduled for the 2030s, will deploy a descent probe to analyse the planet’s atmosphere and surface, as per reports. The European Space Agency’s EnVision mission will use radar mapping to explore Venus’s surface and atmospheric composition.

These findings provide insight into Venus’s inhospitable history, distinguishing it sharply from Mars, which has evidence of ancient oceans and potential subsurface water reservoirs, according to recent studies.

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SpaceX Falcon 9 Successfully Deploys 24 Starlink Satellites

A Falcon 9 rocket by SpaceX accomplished its 24th mission on Wednesday, December 4, 2024, according to reports. The rocket lifted off from Cape Canaveral Space Force Station in Florida at 5:13 a.m. EST, carrying 24 Starlink satellites to low Earth orbit (LEO). This achievement surpassed the previous 23 flights held by three Falcon 9 boosters. The milestone highlights the reliability and reusability of SpaceX’s Falcon rocket programme, as per sources.

Historic Reuse Milestone Reached

As per a report by Space.com, the Falcon 9’s first stage completed its 24th successful landing approximately eight minutes after liftoff. It touched down on the drone ship “A Shortfall of Gravitas,” stationed in the Atlantic Ocean. The upper stage, meanwhile, deployed the Starlink satellites as planned, approximately 65 minutes post-liftoff. The Starlink constellation, noted as the largest satellite system globally, currently comprises over 6,750 operational satellites, a number that continues to expand steadily, according to SpaceX’s updates.

Significant Achievements for the Falcon Programme

SpaceX’s Falcon 9 has achieved over 400 launches and 378 booster landings, as per the company. This mission further underscores the progress of the Falcon family, which includes the workhorse Falcon 9 and the heavier Falcon Heavy variant. These advancements are significant in making space access more economical and sustainable. The booster used in this mission, now on its 24th flight, highlights the durability of SpaceX’s engineering, as per reports. This achievement is a benchmark in the space industry’s move toward frequent and reliable orbital missions.

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Indian Ocean Study Reveals Bay of Bengal Defies Ekman’s Wind-Driven Current Theory

A study published in Science Advances has identified a significant anomaly to Vagn Walfrid Ekman’s widely-accepted theory on wind-driven ocean currents. Conducted by a team of researchers from NOAA, the Indian National Center for Ocean Information Services and the University of Zagreb, the study focused on the Bay of Bengal in the Indian Ocean. Data spanning several years from a buoy stationed off India’s eastern coast was examined, revealing that ocean currents in this region deflect leftward, contradicting the theory’s predictions for the Northern Hemisphere.

Ekman’s Theory and Its Longstanding Influence

The Ekman theory, developed in 1905 by Swedish oceanographer Vagn Walfrid Ekman, asserts that surface ocean currents are deflected 45 degrees to the right of wind direction in the Northern Hemisphere due to the Coriolis force. Successive layers beneath the surface exhibit similar patterns, forming the Ekman spiral. This mechanism, though robust, assumes idealised conditions, including uniform ocean depth and density. Variations such as those observed in the Bay of Bengal highlight its limitations.

Findings from the Bay of Bengal

As per the study, according to data collected over several years, currents in the Bay of Bengal were found to veer leftward despite prevailing winds, defying Ekman’s predictions. This anomaly underscores the need to reassess assumptions about global oceanic patterns. The researchers suggested that local factors, including unique regional wind patterns and oceanic dynamics, could play a significant role.

Implications for Climate Models

It was noted in a statement by the researchers that the findings could influence future climate modelling efforts. If exceptions to Ekman’s theory exist in the Bay of Bengal, others might also occur globally, underscoring the need for more detailed oceanographic studies. Discussions have also highlighted the potential deployment of a NASA satellite system to monitor wind and surface currents comprehensively.

This study has brought attention to gaps in understanding wind-driven currents, stressing the importance of revisiting established models as global warming continues to impact ocean behaviour.

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Can We Defend Earth from Asteroids? Here’s What You Need to Know

Efforts to shield Earth from asteroid impacts have advanced, but significant gaps remain in planetary defence systems. Robin George Andrews’ book How to Kill an Asteroid delves into the complexities of safeguarding the planet from potentially catastrophic asteroid collisions, as per a report. According to the book, the key strategy involves deflecting asteroids from their trajectories rather than destroying them, an approach tested by NASA’s Double Asteroid Redirection Test (DART) in 2022. This mission marked a major milestone in space defence, successfully altering the orbit of the asteroid moonlet Dimorphos.

NASA’s DART Mission and Its Implications

As per a report by ScienceNews, NASA’s DART spacecraft demonstrated the feasibility of redirecting a non-threatening asteroid during its mission. As reported, the spacecraft collided with Dimorphos on September 26, 2022, changing its orbital path. This first-of-its-kind success showcased a viable strategy to prevent future impacts, as noted in the mission’s post-analysis. However, experts caution that DART represents the only proven method, highlighting the need for further advancements.

Gaps in Planetary Defence Systems

Planetary defence faces substantial challenges, particularly in detection capabilities. Sources indicate that the proposed Near-Earth Object Surveyor (NEO Surveyor), designed to enhance asteroid detection, has faced delays due to budgetary cuts. The loss of key observational tools, such as the Arecibo Observatory, has also hindered monitoring efforts. These setbacks, as highlighted by researchers, underscore the urgent need for investment in detection technologies.

Global and Social Ramifications

Addressing asteroid threats extends beyond scientific and technological measures. Experts have raised concerns about potential geopolitical and societal disruptions following asteroid warnings. Scenarios such as misinformation, economic instability, and political tensions have been cited as potential consequences, adding complexity to planetary defence planning.

While challenges remain, Andrews’ book underscores the necessity for global cooperation and reinvestment in asteroid preparedness to prevent future catastrophes. Scientists and policymakers continue to advocate for expanded efforts, ensuring readiness to counter celestial threats.

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Gaganyaan Astronauts Finish First Phase of Training for ISRO-NASA Joint Mission

The first phase of astronaut training for India’s Gaganyaan mission, a collaborative effort between the Indian Space Research Organisation (ISRO) and NASA, has been successfully completed. ISRO announced this milestone in an official statment, which confirmed that Group Captain Shubhanshu Shukla, the primary crew member, and Group Captain Prasanth Balakrishnan Nair, the backup crew member, have concluded their initial training in the United States. The Gaganyaan mission, scheduled for late 2026, marks India’s first human space flight.

Training Details and Key Milestones

The initial training, which commenced in August, has been focused on preparing the astronauts for their roles in the mission. In a post on X (formerly known as Twitter), ISRO revealed that the programme included mission-related ground facility tours, an overview of launch sequences, SpaceX suit fitting sessions, and space food trials. The astronauts were also familiarised with the SpaceX Dragon spacecraft and systems onboard the

International Space Station (ISS).

As per reports, ISRO said that a significant part of this phase involved simulations for potential emergencies in space. Medical emergency training and operational drills were highlighted as critical components of this preparation. The programme also covered day-to-day operational routines and communication protocols required during the mission.

Focus of the Next Training Phase

The astronauts will now proceed to advanced training, as confirmed by ISRO. The upcoming phase will involve hands-on modules for the U.S. Orbital Segment of the ISS. Focus will also be placed on scientific research experiments in microgravity and operational training aboard the SpaceX Dragon spacecraft.

The Gaganyaan mission represents India’s significant step into human space exploration. With comprehensive training modules and collaborative efforts between ISRO and NASA, the programme is seen as a vital contribution to the global space community. According to ISRO, the astronauts are undergoing rigorous preparations to ensure the mission’s success.