Articles tagged with Stars
The Gemini Deep Deep Survey reveals that a large fraction of stars in the Universe are already in place when the Universe was young, contradicting existing models. The survey provides a comprehensive sample of galaxies in the Redshift Desert, revealing more metal-rich galaxies than expected.
Dark matter forms smaller clumps that resemble galaxies and globular clusters in our luminous universe. Computer simulations show these clumps have intricate substructures and dynamic lives independent of visible matter, leading to a template for the visible universe.
The study provides strong support for the popular cold dark matter model of the universe, suggesting that galaxies are surrounded by massive, three-dimensional halos. The team measured the shapes of over 1.5 million distant galaxies using weak gravitational lensing, revealing that dark matter halos extend far beyond visible stars.
Researchers have identified a population of globular star clusters drifting freely through the vast expanse of intergalactic space, revealing insights into the origins of these ancient structures. The discovery is thought to be the result of galaxy collisions or gravitational pulls that tore these star clusters from their parent galaxies.
Scientists have found evidence of hot gases on the perimeter of the Coalsack, a cold dust cloud nearby the Milky Way. This discovery may help resolve debates about oxygen VI generation and provide new insights into star formation and galaxy energy production.
The STELLAR study found CRESTOR 10-40mg reduced LDL-C by 46 to 55 percent, while raising HDL-C by 7.6 to 9.6 percent compared to other statins. The study was part of AstraZeneca's GALAXY Program and included over 19,000 patients from 23 countries.
The Department of Energy recognizes PPPL's DeLooper for his crucial role in coordinating the Snowmass Fusion Summer Study Workshops, which brought together leading scientists from the US and international community. This success led to a consensus in the fusion community that enabled the Administration to join ITER negotiations.
Researchers pinpoint stellar production of helium, revealing it was 24-25% of matter in the primordial universe. The study's findings suggest metal-rich stars produce 2.1 times as much helium as metals, with implications for dark energy.
A new study suggests that black holes can form before galaxies, with massive black holes found in even the smallest active galaxies. The research, led by Marianne Vestergaard at Ohio State University, uses a method to estimate the mass of distant black holes and finds that they are often more massive than previously thought.
Researchers conclude dark energy is the dominant form of energy in the universe, contradicting observations of distant supernovae. The accelerating expansion of the universe can be explained by the presence of negative pressure in a vacuum, supporting the existence of dark energy.
Researchers at Ohio University have discovered a massive X-ray disk in an elliptical galaxy, revealing complex dynamics and challenging previous assumptions about galaxy formation. The giant disk is 90,000 light years wide and spinning through the galaxy, suggesting that elliptical galaxies may not be as simple as previously thought.
New theory explains why circumstellar Keplerian disks are stable around Be stars, contradicting previous model's predictions. The Magnetically Torqued Disk model suggests a narrow range of star types can form detectable disks.
A team of UCSD researchers found that regular outbursts of ultraviolet radiation from massive stars may play a significant role in stirring up galaxies. The simulation study suggests that this radiation acts as an important regulation mechanism, inhibiting further star formation and regulating the galactic perturbations.
Astronomers have identified a vivid scar in the Centaurus A Galaxy, composed of clusters of young blue stars formed after the galaxy absorbed a smaller satellite galaxy 200 million to 400 million years ago. The discovery suggests absorption of smaller galaxies may contribute to galactic halo formation.
Researchers have developed a synthetic guide star system that can correct for atmospheric turbulence in about three fifths of the sky, opening up a much larger portion of the heavens for study. The system uses laser beams to create artificial stars, providing high-quality images of planets, galaxies, and other objects.
Researchers have discovered a new class of objects in two nearby galaxies, NGC 1023 and NGC 3384. These 'faint fuzzies' are thought to be about the same age as globular clusters but look and act differently, with sizes ranging from 50 to 100 light-years across.
Researchers used data from thousands of galaxies to assess theories of star formation and stellar population dynamics. The cosmic spectrum shows a predominantly greenish hue due to the large numbers of old red stars and young blue stars in the universe.
Researchers using the European Space Agency's Infrared Space Observatory have found that VY Canis Majoris' smoky shroud consists of tiny particles made up of iron whiskers and amorphous silicates. The study provides new insights into the star's massive outflow, which is driven by intense pressure from its light output.
Researchers have identified new star structures in the halo of the Milky Way that could alter the standard model of the galaxy. The discovery was made using data from the Sloan Digital Sky Survey, a cataloging project that has imaged millions of stars.
Astronomers have produced a new spectral atlas of massive, hot O-type stars in the Magellanic Clouds. The atlas provides detailed information on the stars' temperatures and life cycles, helping researchers analyze these critical engines driving galaxy evolution.
Neutrinos may fly out first in powerful gamma-ray bursts, carrying details of the universe's first stars. Scientists believe neutrino bursts can help detect massive star collapses and dark gamma-ray dark collapses.
The Hubble Space Telescope has revealed a spectacular ultraviolet galactic ring surrounding the spiral galaxy NGC 6782. The bright ring is made up of recently formed hot stars and marks a significant region of ongoing star formation. Astronomers believe that the unique shape of this ring may be linked to the presence of bars in galaxies.
China and Chile are now linked to U.S. universities through the STAR TAP global network, enabling high-speed data exchange for international collaborations. The connection enhances China's participation in next-generation Internet research and supports Chile's astronomical projects.
Astronomers use NASA's Chandra X-ray Observatory to study the growth of Perseus A, a supergiant galaxy at the center of a large galaxy cluster. The research reveals that Perseus A has accumulated hundreds of billions of stars by cannibalizing gas and smaller galaxies in the vicinity.
Researchers have produced complete maps of CO emission in IC 10, a nearby dwarf irregular galaxy. This observation may offer insights into the formation of stars in the early universe. The team discovered that molecular gas generally lies near dense atomic hydrogen and young, recently formed stars.
Researchers from the University of Washington have discovered that Barnard's Galaxy, an irregular dwarf galaxy, is significantly different from the Milky Way. Using images taken by the Hubble Space Telescope, they found three star clusters within NGC 6822 to be of very different ages, with one cluster dating back 15 billion years.
A new NASA satellite has provided unprecedented sensitivity to detect molecular hydrogen, the primary ingredient for star and planet formation. This discovery suggests that star formation proceeds similarly across various space environments, including nearby galaxies.
Lawrence Krauss, a prominent astrophysicist, has won the AAAS Public Understanding of Science and Technology Award for his efforts to improve communication between scientists and the public. His work aims to promote scientific literacy and critical thinking, particularly in addressing creationism in public schools.
Researchers used supercomputer simulations to test two competing scenarios explaining high-redshift galaxies. The collisional starburst scenario, which suggests small galaxies trigger intense bursts of star formation, received strong support from the simulation results.
Researchers compiled a catalog of 200 nearby spiral galaxies and discovered that approximately 30% contain bar-shaped bands of stars, which are more common than thought. Infrared telescopes revealed the presence of these bars, indicating that galaxies have interacted with each other in the last 10 billion years.
Astronomers have obtained the clearest view yet of the center of the Andromeda galaxy, revealing a double nucleus that has long puzzled scientists. The study uses new Hubble images to map the orbital motions of stars around the black hole at the galaxy's core.
A researcher has detected an enormous black hole at the center of the Milky Way galaxy, with a mass 2.6 million times that of our Sun. The discovery was made using advanced imaging techniques and provides a definitive view of a part of the galaxy previously unseen.
A team of astronomers detected a population of distant, dusty galaxies forming stars at rates 10-100 times higher than most optical sources. The discovery suggests that much of the star formation in the distant Universe may be hidden to visual observations, requiring a combination of both optical and submillimeter observations.
Astronomers have discovered bluer galaxies in nearby clusters, indicating recent star formation and a possible ongoing process. The finding revises the Butcher-Oemler effect, suggesting that some clusters may still be forming new stars.
Researchers used computer simulations and high-resolution observations to understand how stars form when galaxies collide. Clumping in gas on a large scale triggers bursts of star formation.
Astronomers have found far more dwarf galaxies than expected in a survey of just 2% of data from the Parkes radio telescope. The discovery suggests that dwarfs may be 'crumbs' left over when bigger galaxies formed and could provide clues about the distribution of dark matter.
A new planet has been discovered around the star 16 Cygni B with an orbital eccentricity of 0.6, unlike any other known planet in our Solar System. This extreme oblong shape indicates the planet experiences significant variations in heat energy as it orbits its host star.
The MSX satellite has obtained two unique images of the Small Magellanic Cloud, a small companion galaxy to the Milky Way. The images reveal new details about the galaxy's structure and evolution, including hot stars, cool giant stars, and nebulae.