Articles tagged with Gravitation
A new experiment at CERN has shown that gravity pulls antimatter downward, eliminating the possibility of antigravity. The gravitational acceleration of antimatter is close to that for normal matter on Earth, with a value within about 25% of normal gravity.
The Antihydrogen Laser Physics Apparatus (ALPHA) collaboration has measured gravity's effect on antimatter for the first time, confirming it falls downwards. This breakthrough could help explain the universe's lack of antimatter.
A multi-institutional team analyzed the flow of simulated regolith using an artificial gravity generator on the ISS. The study found that flow characteristics follow well-known physical laws even at low gravity, and bulk density decreases with gravity.
Researchers at the University of Manchester are enhancing bioprinting technology to create new skin, bone, and tissue for transplantation in space. The project aims to protect astronauts' health from diseases like osteoporosis caused by microgravity exposure.
A new study by Kyu-Hyun Chae found conclusive evidence for the breakdown of standard gravity in low acceleration limit using up to 26,500 wide binaries observed by Gaia. The results show a boost factor of 30-40% higher than Newton-Einstein prediction, meeting conventional criteria of 5 sigma significance.
Researchers from the University of Bonn have developed a new method to calculate global water distribution, combining satellite data with hydrological models. The study reveals that droughts are significantly more common across the world than previously thought, with localized droughts often missing from satellite data.
Researchers report evidence of a cosmic background of gravitational waves likely produced by the merger of supermassive black hole binaries. The signal is detected through millisecond pulsar observations and has implications for our understanding of the universe's large-scale structure.
A Purdue University experiment is investigating how reduced gravity affects boiling and condensation, crucial for long-term space habitats. The research aims to provide data needed to answer decades-old questions about these phenomena in weightlessness.
Researchers predict that two black holes producing chirp signals preferentially occur in two universal frequency ranges, providing insights into black hole formation and stellar explosion mechanisms.
A new study by NASA and Japan's Osaka University suggests that rogue planets, drifting through space without a star, may outnumber stars with orbiting worlds. The Roman Space Telescope could discover up to 400 Earth-mass rogue planets, according to the findings.
The galaxy NGC 1277, a massive relic galaxy, has been found to lack dark matter, contradicting current cosmological models. The team used integral field spectrograph observations to determine the mass distribution within the galaxy, revealing that it is solely composed of stars.
A team from Leibniz University Hannover and University of Bremen confirmed the equivalence principle, proving passive and active gravitational mass are always equivalent, regardless of composition. This finding contradicts quantum theory's prediction of a violation, with accuracy 100 times greater than previous studies.
For over a billion years, the sun's atmospheric tide countered the moon's gravitational pull, keeping Earth's rotational rate steady and day length at 19.5 hours. This balance was disrupted by climate change, resulting in our current 24-hour day stretching to over 60 hours if not for the pause.
Researchers from West Virginia University have made a groundbreaking discovery by detecting evidence of low-frequency gravitational waves, which can only be perceived with a detector much larger than the Earth. The signal was detected using pulsar timing arrays and has significant implications for understanding spacetime dynamics.
A team of scientists from UNIGE, Northwestern University, and the University of Florida used POSYDON code to simulate binary-star populations, predicting the existence of massive 30 solar mass black hole binaries in Milky Way-like galaxies. This challenges previous theories and provides new insights into the astrophysical origins of me...
Researchers from the University of Florida have discovered evidence for gravitational waves at very low frequencies, consistent with Einstein's theory. The detection uses a network of radio telescopes to capture millisecond pulsars and create a galaxy-scale gravitational-wave detector.
A recent study from SISSA suggests that dark matter interacts with gravity in a non-local way, providing a fresh perspective on its nature. The new model, which employs fractional calculus, accurately describes the motion of stars in smaller galaxies.
Researchers discovered a gravitationally lensed supernova named SN Zwicky, which was magnified nearly 25 times by a foreground galaxy. This discovery presents an opportunity to study the inner cores of galaxies, dark matter, and the mechanics behind universe expansion.
A study of 30 astronauts found that brain ventricles expand significantly after longer space missions, taking up to three years to fully recover. The expansion is caused by fluid shifting upward in the absence of gravity, leading to potential long-term health concerns for space travelers.
A team of researchers developed a self-checking deep learning system that accurately extracts information from gravitational-wave data. The algorithm, called DINGO, has been trained to interpret real data and can cross-check its own results for accuracy.
A UTSA-led research team has discovered a new exoplanet using indirect methods. The exoplanet, HIP 99770 b, is about 14 to 16 times the mass of Jupiter and orbits a nearly twice-as-massive star. This breakthrough opens a new avenue for scientists to discover and characterize exoplanets.
A machine learning technique called PRIMO has been used to reconstruct a sharper image of the M87 black hole using Event Horizon Telescope (EHT) data. The new image reveals more detailed information about the bright accreting gas and a larger, darker central region.
A team of scientists from Kyoto University has confirmed that galaxy alignments can be a powerful probe for dark matter and dark energy. The analysis of 1.2 million galaxy observations verified general theory of relativity at vast spatial scales, providing strong evidence for gravity's role in shaping the universe.
A new theory, dubbed the Pancosmorio theory, emphasizes the importance of maintaining an Earth-like ecosystem for human survival in deep space. The key factors include gravity, which induces a pressure gradient in the body, and oxygen, which is generated by plants on Earth.
Physicists discover correspondence between dense states of gluons and enormous black holes, both characterized by self-interacting force carrier particles. The study reveals universal limits on entropy and information content in these systems.
Researchers found that newborn chicks prefer stimuli moving upward against gravity, even without prior experience. This innate preference suggests that animals are born with a predisposed knowledge of sensitivity to simple features guiding behavior from birth.
The DART mission observed a 33-minute change in the orbit of Dimorphos, indicating that ejecta escaped the system and contributed to the orbital changes. The team will use this data to understand how the entire system's orbit changes over time.
A team of researchers has discovered evidence of 'cosmological coupling' between black holes and the universe's expanding energy. By studying supermassive black holes in ancient galaxies, they found that these black holes gain mass over billions of years, matching predictions for black holes that cosmologically couple with vacuum energy.
Researchers studied functional brain connectivity in fighter pilots to understand its relevance to astronauts. They found specific brain connectivity patterns that may aid in training programs for pilots and astronauts.
A University of Utah-led study explores using space dust as a shield to reduce solar radiation and slow global warming. Launching lunar dust from the moon instead of Earth's way station at L1 could be an effective and cheap solution.
A team of astronomers has directly measured the mass of a dead star using gravitational microlensing, a phenomenon predicted by Einstein's General Theory of Relativity. The measurement, made for an isolated white dwarf called LAWD 37, provides new insights into star evolution and testing current theories of how white dwarfs evolve.
A team of researchers has created a highly accurate map of the universe's matter distribution, combining data from two major telescope surveys. The analysis reveals that matter is less 'clumpy' than expected, suggesting potential inconsistencies with the current standard model of the universe.
Researchers have successfully replicated the type of gravity that exists on or near stars and planets using a glass sphere measuring 3 cm in diameter. This achievement could help scientists understand and predict how solar weather affects spacecraft and satellite communications systems.
Researchers developed a novel way to store energy by transporting sand into abandoned underground mines, creating a long-term energy storage solution. The technology generates electricity when the price is high and stores it when cheap, making it an effective and cost-efficient alternative to traditional batteries.
Astronomers have discovered two ghostly Goliath black holes just 750 light-years apart, closing in on a cataclysmic meeting. The estimated population of merging supermassive black holes may be surprisingly high, generating strong gravitational waves detectable by future telescopes.
Researchers from Cornell University and Clemson University conducted droplet experiments on the ISS to investigate larger droplets due to lower gravity, expanding the parameter space of the Davis-Hocking model. The results confirmed and expanded the model, providing insights into droplet dynamics.
A new theory proposes that irritable bowel syndrome (IBS) may be caused by the body's inability to manage gravity. The hypothesis suggests that gravity can compress the spine, decrease flexibility, and cause organs to shift downward, leading to IBS symptoms.
According to new research led by the University of Bath, some short-duration gamma-ray bursts are triggered by the birth of supramassive stars, not black holes. This discovery may offer a new way to locate neutron star mergers and gravitational wave emitters.
A team of researchers used images from the Hubble Space Telescope to determine the age and composition of a distant supernova. The study suggests that the heavier atomic elements necessary for life were created inside stars and released during supernovae explosions.
Astrophysicists have identified a potential test to rule out cosmic inflation, a theory explaining the universe's origins. The cosmic graviton background (CGB) could provide evidence against inflation if detected, and its impact on the early Universe's expansion rate could be measured by next-generation probes.
Researchers have developed a new model that combines nuclear physics and string theory to describe the transition to dense and hot quark matter in neutron star collisions. The model allows for the calculation of gravitational-wave signals, showing that both hot and cold quark matter can be produced.
Researchers investigated open star clusters, finding they dissolve faster than predicted by Newton's laws. The team developed a new method to count stars in tidal tails, revealing a significant difference in the number of stars between the front and rear tails.
Researchers have developed a method to map an asteroid's interior structure based on its spin changes during close encounters with Earth. This technique, called AIME, could help scientists plan more effective defense strategies for asteroids like Apophis, which poses a significant hazard if it were to make impact.
Scientists have confirmed 68 strong gravitational lenses, transforming our understanding of galaxy evolution and dark matter. The discovery uses machine learning algorithms to identify thousands of potential lenses, opening a new window into studying mass distribution in distant galaxies.
A Cornell undergraduate has found a potential solution to immune dysfunction in space, suggesting that a transcription factor called MRTF could be the missing link. The study identified changes in the cytoskeleton of macrophages as a key factor in immune system dysfunction.
The MICROSCOPE satellite has confirmed the equivalence principle with unprecedented accuracy, supporting Einstein's general relativity. The result shows that any deviation in acceleration is less than 1 part in 10^15, ruling out some candidate universal theories of physics.
Astronomers propose a new method to measure the universe's expansion rate by analyzing the changes in signal properties of black hole collisions. By using the entire population of black holes as a calibration tool, scientists can directly identify and correct for errors, providing a more accurate measurement.
Researchers used Stampede2 supercomputer to simulate star seeding, heating effects of primordial black holes. The study found that these two effects cancel each other out, with little impact on star formation.
Scientists have created a robot that moves without pushing against anything in curved space, defying the law of conservation momentum. The research challenges physical laws and intuition designed for flat space, with potential applications in space navigation and robotics.
Researchers from the University of Bonn found that dwarf galaxies in one of Earth's nearest galaxy clusters show signs of disturbance without dark matter halos. The study's results contradict previous models, suggesting an alternative gravity theory might be more accurate.
Researchers used microwaves from the cosmic microwave background to measure dark matter distribution around distant galaxies. The findings suggest a different clumpiness measurement than predicted by the Lambda-CDM model, hinting at a possible flaw in the current cosmology theories.
Researchers from Japan review the effects of reduced gravity on muscles and nerve responses, suggesting that afferent neural activity plays a key role in regulating muscle properties. They recommend exercise countermeasures such as walking with rear foot-strike landing and periodic passive stretching to prevent neuromuscular problems.
Researchers from ETH Zurich conducted a new experiment to redetermine the gravitational constant G, obtaining a value 2.2% higher than the current official figure. The team used a dynamic measurement method involving resonating beams, allowing for real-time data analysis and minimization of interference.
A SwRI study examines elliptical craters on Saturn's moons Tethys and Dione, finding unique patterns that indicate the satellites' age and formation conditions. The research suggests a planetocentric impactor population, pointing to the importance of considering gravity-driven impacts when studying object ages.
Researchers at UC Berkeley have detected a possible free-floating black hole in the Milky Way galaxy using gravitational microlensing. The object's mass is estimated to be between 1.6 and 4.4 times that of the sun, but its nature as a black hole or neutron star remains uncertain.
Researchers propose a novel gravitational-based storage solution using lifts in tall buildings to store energy. The system, called Lift Energy Storage Technology (LEST), stores energy by lifting wet sand containers or other high-density materials.
Researchers propose that Ceres was formed outside the Frost Line, where ammonia ice is abundant, and then pulled into the Asteroid Belt by gravitational instability. Computer simulations support this hypothesis, showing that giant planet formation led to a turbulent environment that scattered objects into stable orbits.
The Event Horizon Telescope Collaboration has captured the first direct visual evidence of a supermassive black hole at the centre of our galaxy. The image reveals a dark central region surrounded by a bright ring-like structure, indicating the presence of a massive object four million times more massive than our Sun.
The Event Horizon Telescope (EHT) has captured the first image of Sagittarius A*, a black hole at the center of the Milky Way, revealing a ring-like structure and shadow. The observation confirms Einstein's theory of general relativity and provides new insights into giant black holes.
Researchers developed a technique to study supermassive black holes smaller than M87's by measuring the brightness of their shadows over time. The 'shadow' signal can reveal the size and shape of a black hole's event horizon, shedding light on gravity's nature.