Astronomers using the Georgia State University Telescope array have found that nearby stars darken toward their edges more strongly at near-infrared wavelengths than predicted by several widely used models of stellar atmospheres. This effect, known as limb darkening, makes a star appear fainter at its edge than at its center.
Researchers found that early galaxies were already producing and dispersing heavy elements, such as oxygen and carbon, 500 million years after the Big Bang. This discovery challenges previous assumptions and provides insights into the early universe's chemical evolution.
A new study suggests that neutrino flavor conversion plays a significant role in determining the fate of dying massive stars. The research found that neutrino behavior can alter the outcome of stars, particularly for those with masses between 16 and 30 solar masses, potentially explaining the supernova rate problem.
A new survey of 29 massive stars in extremely metal-poor galaxies reveals unexpectedly weak stellar winds, delivering the largest-ever dataset of its kind. The findings could reshape our understanding of how galaxies formed in the early universe, and provide insights into the evolution of massive stars.
Researchers have discovered a retrograde planet orbiting a small star, a rare occurrence that raises new questions about planetary formation and evolution. The GJ 3090 b planet's unusual orbit may be the result of its host star acquiring a second disk of gas and dust, which could have shaped its planetary system billions of years ago.
Researchers found that cosmic star formation has declined dramatically, but neutral atomic hydrogen density has only decreased slightly. The study suggests that the decline in star formation activity is not due to the depletion of gas, but rather a decrease in the efficiency of converting gas into molecular hydrogen.
Researchers have provided the first experimental evidence that strong magnetic fields surrounding active stars can completely suppress coronal mass ejections. This discovery helps explain why CMEs are rarely observed on stars other than the Sun.
Astronomers have discovered the fastest star in the Milky Way, S301, orbiting the supermassive black hole Sagittarius A* at a speed of 25,000 km/s. The star's tight orbit takes just 8.7 years to complete and approaches the black hole at a mere 12 times the distance of Earth to the Sun.
A team of scientists, led by Wladimir Lyra at New Mexico State University, propose a new mechanism for forming massive planets around supermassive black holes. Computer simulations show how these planets can grow to sizes comparable to those of stars, potentially igniting nuclear fusion.
Astronomers have discovered the earliest known 'black hole star,' which may explain how billion-solar-mass black holes formed in the early Universe. The object, dubbed MoM-BH*-1, exhibits properties normally associated with stars, resolving a long-standing challenge in understanding mysterious 'little red dots'.
Researchers observe star fragments plowing through surrounding gas, tracing the recycling process that supplies raw materials for new planets and stars. The study offers a glimpse into the potential fate of our Sun, which will shed its outer layers and return material to the Milky Way.
A team of astronomers has discovered an extremely bright and red spot in the early universe, which they believe is a mashup of a black hole and a star. The object, dubbed a 'black hole star,' would help solve the mystery of other mysterious 'little red dots' found in deep-space images.
Astronomers have discovered the first globular cluster stellar stream outside the Milky Way, providing a powerful tool for studying dark matter. The study uses the stream's shape to reconstruct the galaxy's gravitational field and infer how dark matter shaped the stars' orbits.
Researchers from the University of Missouri discovered that the ratio of large and small stars in distant galaxies depends on their environment, potentially altering how scientists estimate galaxy mass and age. This breakthrough could lead to more accurate estimates and a better understanding of the universe's history.
The SDSS-V survey has released its twentieth public data release (DR20), providing a massive catalog of high-quality spectra of stars across the Milky Way. The dataset includes over two million total spectra, revealing temperatures, ages, and chemical compositions of stars.
Researchers from Kyushu University found that low-density gas contributes to hub growth through direct inflow and by replenishing nearby dense filaments, substantially underestimating the material available for massive star formation. The study's combined analysis of dense and diffuse gas increased estimated material flowing onto hubs ...
The Sloan Digital Sky Survey has released its 20th data set, featuring over three million spectra of stars and galaxies, as well as 18 new value-added catalogs. This release marks a significant expansion of the survey's efforts, integrating full all-sky panoptic spectroscopy across both hemispheres.
Researchers at Uppsala University recalculated the Sun's silver content using a new model that predicts 55% more silver than previous estimates. This resolves a long-standing problem of missing silver in the solar system and improves our understanding of how elements are produced in stars and incorporated into planets.
Researchers directly observed four white dwarf stars orbiting double star systems in our cosmic backyard. The new results revealed that each system had a red dwarf companion, which was hiding the white dwarf's light. This discovery allows researchers to update the local white dwarf census within 20 parsecs of Earth.
A team of researchers from Kyushu University and Max Planck Institute for Extraterrestrial Physics have detected ambipolar diffusion in a prestellar core, weakening magnetic support and leading to gravitational collapse. This finding provides insight into early star formation and the creation of stellar systems like our own.
A team of U of A astronomers helped an international research consortium discover the faintest and farthest quasars in the early universe, revealing new insights into supermassive black holes and their host galaxies. The discovery includes two record-breaking quasars with cosmic ages of about 670 million years.
Astronomers discovered a giant planet orbiting a dead star, WD1856b, and used NASA's James Webb Space Telescope to analyze its atmosphere. The study found the planet migrated toward its dead companion billions of years after the star died, surviving destruction through extreme heat.
New study by University of Southampton confirms the universe's expansion is still accelerating as previously found, debunking 2025 claims that the cosmos was slowing. The team re-evaluated data using Type Ia supernovae to calculate vast cosmic distances and found no error in their methods.
Astronomers at UNC-Chapel Hill played a key role in identifying the source of mysterious long-period radio transients. The discovery of ASKAP J1745–5051, a binary star system containing a white dwarf and red dwarf companion, provides strong evidence for the origin of these unusual bursts of radio waves.
A team of astronomers has identified a rare stellar system that provides a unique natural laboratory to study extreme physics. The system, called ASKAP J1745−5051, consists of a white dwarf and a red dwarf star, producing powerful bursts of radio waves and X-rays.
Astronomers have found strong evidence that young red dwarf stars can swallow their own nearby planets. The study, published in Monthly Notices of the Astronomical Society, suggests that six different red dwarfs had engulfed Earth-like rocky planets, providing a fresh burst of lithium to their atmospheres.
Researchers at Kyushu University used 3D computer simulations to understand the physics behind hub-and-spoke patterns in star-forming regions. The study shows that oblique shocks create invisible channels guiding compressed gas into central filaments, forming the radial shape of baby stars' cradles.
The study suggests that massive galaxies formed through violent mergers, leading to a rapid burst of star formation and the growth of supermassive black holes. This process prevented these galaxies from producing new stars for over a billion years, leaving them as quiescent galaxies.
The study reveals that more massive young star clusters clear away their natal gas faster than lower-mass clusters. This has implications for our understanding of star formation and how the young stars affect their surroundings.
An international team of astronomers, led by Daniela Calzetti, has observed the 'natal clouds' surrounding young star clusters for the first time. The study reveals that massive star clusters disperse their gaseous shroud faster and light up their galaxy earlier than smaller ones.
The new facility enables scientists to observe and measure detonation forces in unprecedented detail, shedding light on industrial safety risks and potential breakthroughs. Researchers aim to develop safer designs and protocols by examining detonation disasters like the Buncefield Fire.
A team of researchers at Kyoto University used NICER and Hisaki to study a superflare on the star UX Arietis, finding that photoionization is the dominant mechanism behind the iron Kα line. This discovery provides a diagnostic tool for astronomers to infer flare locations on stellar surfaces.
Astronomers using astroseismology have found that massive stars' rotation rates decrease with age, but a new study suggests this may not be the case. The research team used 3D simulations to investigate how magnetic fields affect rotation inside massive stars, revealing that some configurations can spin the core up.
Ultra-faint dwarf galaxies, tiny satellite galaxies of the Milky Way, can reflect conditions of the early universe, shedding light on galaxy formation and dark matter. Simulations suggest these small galaxies are sensitive to early radiation environment and can probe the universe's earliest climate.
Researchers at ISTA team present theoretical evidence that magnetic fields in stars can persist through all stages of evolution, emerging as 'fossil fields' at the surfaces of older remnants. This discovery sheds new light on our understanding of stellar magnetism and its relation to starquakes.
Astronomers have identified a metal-poor star in the Large Magellanic Cloud, which is almost entirely hydrogen and helium with trace amounts of carbon and iron. Studying this low-mass star can help clarify our understanding of the first generation of stars, called Population III stars.
Astronomers have identified the most pristine star in the known universe, SDSS J0715-7334, with a metal content of less than 0.005%. This ancient immigrant was born about 80,000 light-years from Earth and has been pulled into the Milky Way galaxy over time.
Researchers from Kyushu University used ALMA to observe a baby star producing a giant ring of gas about 1,000 au in size, which helps the star release excess energy. The team found that this ring is slightly warmer than its surroundings and hypothesize it's produced through magnetic field threading.
Researchers from ISTA identify two white dwarfs, Gandalf and Moon-Sized, which share five properties, including X-ray emission, despite being isolated objects. These discoveries suggest the existence of a new class of star remnants with unique magnetic and rotational properties.
Astronomers from the University of Liège have solved a 50-year-old stellar mystery by attributing the X-rays emitted by Gamma Cas to a magnetic white dwarf orbiting the star. The study used high-energy astrophysics instrumentation and revealed that the X-rays are associated with the compact companion, not the massive Be star itself.
The Small Magellanic Cloud's stars do not orbit around its center due to a direct collision with the Large Magellanic Cloud. The collision disrupted the SMC's internal structure and destroyed its gas rotation, making it a unique case to study galaxy evolution.
Researchers found our Sun joined a mass migration of similar stars 4-6 billion years ago, shedding light on galaxy evolution and the corotation barrier. The discovery reveals the time range over which the bar structure at the galactic center was formed.
Researchers analyzed gravitational-wave data from LIGO and Virgo detectors, revealing an oval orbit just before merger, which is unlikely according to theoretical models. The study corrects underestimated black hole mass and overestimated neutron star mass, suggesting a birthplace in an environment with many interacting stars.
Researchers at Nagoya University found that magnetic fields keep the equator spinning faster than the poles in stars, preventing a rotation flip even as they slow down with age. This contradicts 45 years of theoretical predictions and could help scientists solve stellar mysteries.
Researchers analyzed over 40 years of astronomical data to find detectable changes inside the Sun during four quiet periods. The study reveals that even small differences in solar magnetic activity produce measurable changes in the Sun's internal structure.
The Crab Pulsar's unique zebra stripes are shaped by the combination of gravity's lensing effects and plasma's defocusing power. Light rays are spread apart by plasma and pulled inward by gravity, creating interference patterns that produce bright bands and darkness between them.
A team of astronomers led by UMass Amherst has discovered a population of dusty, star-forming galaxies at the edge of the universe, formed 13 billion years ago. These galaxies are linked to ultrabright, young galaxies and massive quiescent galaxies, providing new insights into galaxy evolution.
Researchers discovered a star in the Andromeda Galaxy that vanished without going supernova, instead collapsing directly into a black hole. The team's analysis revealed the process of stellar collapse and provided evidence for convection's role in shaping a black hole's outer layers.
Researchers have captured the first radio waves from a rare type of exploding star, revealing the star's final years. The discovery provides an unprecedented look at a massive star's behavior before its death in a supernova explosion.
Astronomers may need to look beyond the traditional habitable zone for liquid water and potentially life-friendly conditions. A new study suggests that tidally locked worlds, even those orbiting closer to cool M- and K-dwarf stars than previously thought, could sustain liquid water on their night side.
Researchers from the University of Copenhagen have explained the mysterious 'red dots' seen in James Webb Space Telescope images as young black holes. The discovery provides insight into how the universe's first black holes were born and sheds light on their early development.
Researchers have imaged a beautiful shock wave around a dead star, RXJ0528+2838, which challenges our current understanding of how dead stars interact with their surroundings. The team found that the white dwarf has been expelling a powerful outflow for at least 1000 years, driven by its strong magnetic field.
A new study has created a comprehensive model of neutrino mapping, revealing that most stars in the Milky Way generate and emit these ghost particles. The research provides valuable insights into the universe, offering a unique way to explore cosmic phenomena.
Astronomers have created a naturally occurring space weather station around complex periodic variable M dwarf stars to study the environment of planets. This discovery sheds new light on how stars affect their planets' makeup and might provide clues about the habitability of distant worlds.
Researchers at NJIT's Center for Solar-Terrestrial Research have pinpointed a previously unknown class of high-energy particles in the Sun's upper atmosphere responsible for generating intense gamma-ray signals during major solar flare events. These particles, energized to millions of electron volts, are linked to bremsstrahlung emissi...
Recent observations of TRAPPIST-1e, an Earth-sized exoplanet in the habitable zone, reveal hints of methane but raise questions about its atmosphere's existence. Researchers caution that more rigorous studies are needed to determine if the methane is a sign of an atmosphere or stellar contamination.
A new study on TRAPPIST-1's flares could help scientists unravel how the star shapes its nearby planets, potentially in drastic ways. The researchers used observations from NASA's James Webb Space Telescope and computer simulations to understand the physics behind TRAPPIST-1's temper tantrums.
Groundbreaking simulations reveal how black holes create dazzling light shows by material zipping around them. The results could help explain hundreds of faintly luminous objects spotted in the early universe.
A team from Maynooth University is using the Mauve telescope to investigate how stars and planets form, focusing on Herbig Ae/Be stars. The research aims to identify variability and search for signs of early planet formation.
Researchers used NASA's IXPE telescope to study the innermost region of an intermediate polar, revealing a surprisingly high degree of X-ray polarization and an unexpected direction of polarization. The team found that X-rays were emitted from a column of white-hot material pulled in by the white dwarf's strong magnetic field.