Articles tagged with Stars
Elliptical galaxies are found to contain five to ten times as many red dwarfs as thought, with implications for galaxy formation and evolution. The discovery could lead to a reevaluation of dark matter in these galaxies.
Astronomers Andrey Kravtsov and Nick Gnedin's simulations reveal why galaxies were less efficient at making stars in the early universe. The team's model explains the connection between dust, gas, and star formation, shedding light on the evolution of spiral galaxies.
Astronomers from Bonn and St. Andrews discover that the discrepancy between calculated and observed star numbers may be due to an overestimation of stellar crowding, a phenomenon where young stars are born in groups, leading to more massive stars being overlooked.
New work by astrophysicist David Kipping reveals that astronomers can calculate a star's mass using its orbiting planet and moon. By measuring the size of the planet and moon relative to the star and their orbital periods, scientists can use Kepler's Laws of Motion to determine the density of the star.
A team of astronomers has discovered that young galaxies can grow by sucking in cool streams of hydrogen and helium gas, forming new stars. This process, known as accretion, provides a gentler alternative to galaxy mergers, which are thought to be the primary mechanism for galaxy growth.
Distant galaxies in the early Universe are creating 1,000 new stars per year, exceeding our galaxy's star formation rate. These galaxies contain enormous amounts of raw material for new stars, suggesting a higher gas content than previously thought.
A team of astronomers has confirmed the presence of an extreme ultra-luminous X-ray source in a nearby galaxy, which may indicate the presence of an intermediate mass black hole. The object, HLX-1, is located ~300 million light years from Earth and emits radiation 100 times brighter than most other objects in its class.
A team of astronomers from the University of Florida has discovered two Saturn-sized planets and a possible third planet with an Earth-like size orbiting a distant star. The discovery was made using a new method of confirming planets called transit timing variation, which allows for more efficient confirmation of planetary systems.
Astronomers at Texas A&M University have discovered that a significant fraction of ancient galaxies in the CLG J02182-05102 cluster are still actively forming stars. The team found that star-forming galaxies are more common in this cluster than in nearby galaxy clusters.
A team of astronomers from the University of Arizona developed a technique called laser adaptive optics, allowing for sharper images and faster data collection. This technology will enable scientists to study ancient galaxies and star clusters more efficiently.
Rochester Institute of Technology scientist Don Figer is developing a new detector technology that can directly image and characterize exoplanets, potentially finding smaller, rocky planets like Earth. This technology could reduce detection time by one-third and overcome current limitations.
Astronomers propose a new method for detecting extraterrestrial life by analyzing signals from advanced civilizations. The Benford beacons concept suggests that alien signals would not be continuously broadcast but rather pulsed and narrowly directed, potentially making them more detectable.
Researchers at Durham University use huge computer simulations to recreate the beginnings of the Milky Way, finding that many ancient stars originated from smaller galaxies torn apart by galaxy collisions. The simulations provide a blueprint for galaxy formation and reveal clues to the early history of the Milky Way.
A team of scientists led by Jay Pasachoff observed the shiniest object in the solar system, 2002 TX300, a fragment of Haumea, using a network of telescopes. The measurements reveal its icy surface and size, confirming it as a small, reflective body with an age estimated to be around a billion years.
Newberg's team will use LAMOST data to plot the position, speed, and composition of over 7 million stars, shedding light on dark matter distribution and galaxy formation
Researchers have developed a new method for describing proton and neutron binding in nuclei, enabling more accurate predictions of astrophysical reactions. This breakthrough may improve our understanding of star life cycles.
Astronomers have observed a galaxy 10 billion light-years away, finding four discrete star-forming regions making new stars 250 times faster than the Milky Way. The study reveals exquisite detail of these regions, which are 100 times brighter than nearby galaxies.
A massive galaxy in the early Universe created stars like our sun at a rate equivalent to 250 suns per year, researchers say. The team observed four star-forming regions within the galaxy, each over 100 times brighter than similar regions in the Milky Way.
Researchers have solved a 20-year-old astrophysical puzzle using gas dynamical simulations. Filamentary structures formed during the collapse of infalling gas absorb massive stars' radiation, shielding surrounding nebulae from heating.
Researchers at Durham University have discovered a massive explosion that halted star birth in an early galaxy. The blasts scattered gas needed for new stars, regulating the galaxy's growth.
Scientists have discovered a relic star from the early universe, which has a remarkably similar chemical composition to the Milky Way's oldest stars. The discovery supports the theory that our galaxy underwent a 'cannibal' phase by swallowing smaller galaxies and other galactic building blocks.
A study led by Queen's University astronomer Terry Bridges reveals that up to a quarter of the Milky Way's star clusters are foreign, originating from other galaxies. The research suggests six additional dwarf galaxies may exist within the galaxy beyond the two previously confirmed.
The University of California, Berkeley team's paper published in Science won the 2009 Newcomb Cleveland Prize for outstanding contributions to the field. The award recognizes the first visible-light picture of an extrasolar planet and its potential to change our view of how planets originate.
Astronomers have found that typical galaxies still hold sufficient quantities of gas and dust for star formation, but their efficiency has slowed down over cosmic time. This means that present-day galaxies form fewer stars due to a decrease in gas and dust supplies rather than a change in their ability to make stars.
Dr Andrew Benson and Dr Nick Devereux's research reveals the evolutionary history of the universe, explaining galaxy shapes and numbers. Their 'Lambda Cold Dark Matter' model suggests that dark matter haloes drive galaxy evolution, with elliptical galaxies resulting from multiple mergers.
Astronomers found that only 10 percent of stars host planetary systems similar to our own, with several gas giant planets in the outer part of the system. The discovery was made using gravitational microlensing and is based on 10 years' worth of data from the MicroFUN survey.
Astronomers have unveiled an extraordinary cosmic relic, Terzan 5, which formed in at least two different epochs, providing insights into the origin of the galactic bulge. The discovery suggests that Terzan 5 might be the surviving remnant of a disrupted dwarf galaxy contributing to the Milky Way's formation.
Scientists at Durham University discovered rapid star formation in 'stellar nurseries' of infant galaxies, creating new stars at a rate 100 times faster than expected. This finding provides insight into the birth of our own galaxy and how it formed its first stars.
Researchers will study turbulent transport and organization in fusion and astrophysical plasmas to design better, smaller and cheaper fusion systems. Understanding the link between flow self-organization and large-scale flow dissipation may also improve ITER's fusion power production.
Astronomers, including Queen's University physicist Larry Widrow, have discovered a nearby cosmic encounter between the Andromeda and Triangulum galaxies, which collided about two to three billion years ago. The collision caused millions of stars to be ripped from the Triangulum disk, forming a faint stream visible in the PAndAS data.
A team of international researchers has challenged the long-held idea that the ratio of massive stars to lighter ones in star-forming regions remains consistent. They found that this ratio, known as the initial mass function, varies significantly between different galaxies, with some forming more low-mass stars than expected.
Recent simulations by astrophysicists reveal that the first black holes in the universe grew slowly and were deprived of gas, contradicting popular theories. The simulations suggest that these early black holes may have played a more complex role in the formation of supermassive black holes observed today.
Astronomers have discovered a mechanism for the formation of dwarf spheroidal galaxies, which are thought to be composed mostly of dark matter. The 'cosmic dance' of gravitational interactions between galaxies may trigger the removal of stars from smaller dwarf galaxies, transforming them into the observed dwarfs.
Researchers found that turbulence created by material ejected from supermassive black holes' disks prevents cooling gas from forming stars. The discovery explains a long-standing mystery in galaxy cluster physics.
Researchers created a detailed computer simulation of early star formation, revealing the existence of twin stars. The simulations showed that these stars provide seeds for next-generation star formation, helping scientists understand how galaxies formed.
The study found that intense heat from early stars and black holes evaporated gas from small clumps of dark matter, rendering them barren. This natural explanation for galaxy formation supports the view that cold dark matter is the best candidate for the mysterious material believed to make up most of the universe.
A Kansas State University professor is studying new theories about the origin and future of life in the universe. He suggests that artificial black holes could play a part in the evolution of life and potentially spread it throughout the galaxy.
Most 'dark' gamma-ray bursts are found to be similar to normal bursts with an afterglow, but with nearly all visible light obscured by patchy dust. This suggests that gamma-ray bursts may help track star formation and death in distant galaxies.
The CU-Boulder instrument, part of NASA's Hubble Servicing mission, will probe the universe's evolution from its perch on the Hubble Space Telescope. Scientists aim to reconstruct the physical conditions and evolution of the early universe by gathering information from ultraviolet light.
Researchers at Harvard-Smithsonian Center for Astrophysics have created an 'astro-comb' to help detect lighter planets around distant stars. The technique sharpens spectroscopy, enabling more accurate pinpointing of planet locations and opening possibilities for detecting more Earth-like planets.
The study confirms individual galaxies are source of Far Infrared Background, a decade-old question answered. BLAST's submillimeter survey uncovers dust-enshrouded galaxies with properties deciphered through multi-wavelength data.
Scientists reveal that half of the Universe's starlight originates from young, star-forming galaxies billions of light-years away. The discovery was made using a two-tonne telescope carried by a balloon, and analyzes data from the Balloon-borne Large-Aperture Sub-millimeter Telescope (BLAST) project.
NRL researchers join a team to develop a telescope on the Moon for studying an era of the young Universe, during the first 500 million years after the Big Bang. The project aims to detect signals from hydrogen atoms in the Dark Ages, providing insights into the formation and evolution of the modern Universe.
Researchers at Durham University's Institute for Computational Cosmology created simulations to predict galaxy formation and dark matter effects. The work aims to improve understanding of dark matter, a mysterious substance making up 80% of the Universe's mass.
A laboratory experiment has successfully modeled stellar jets, revealing that magnetic forces shape these objects in a non-linear way. The findings suggest that the jets are fired out like bullets or buckshot, rather than breaking into pieces as previously thought.
The American Institute of Aeronautics and Astronautics has published a new book on emerging science of novel propulsion concepts like space drives and warp drives. Researchers Marc Millis and Eric Davis cover NASA's Breakthrough Propulsion Physics Project, enabling human voyages to other star systems.
A team of Yale University astronomers discovered that galaxies stop forming stars before their central supermassive black holes reach their most powerful stage. The study found no bright AGN at the centers of star-forming galaxies, suggesting that the shutting-down process occurs earlier in the AGN's lifetime.
Researchers found evidence of cosmic dust forming around a dying star in a nearby galaxy, similar to those that formed soon after the Big Bang. This discovery provides insight into the early stages of the Universe and challenges the long-held theory that supernovae explosions are the primary source of dust.
A Cornell-led team has observed dust forming around a dying star in a nearby galaxy, providing insights into the early universe and the evolution of galaxies. The discovery sheds new light on how cosmic dust was created in the universe's early stages.
Two independent groups successfully detected the thermal emissions of exoplanets OGLE-TR-56b and TrES-3b using ground-based telescopes. The detections are significant because they will continue to study hot Jupiters beyond the capabilities of the soon-to-be-retired Spitzer telescope.
Researchers analyzed the spectrum of a gamma-ray burst afterglow to probe the star-forming environment of a distant galaxy. They detected molecular gas and metals comparable to those of the Sun, providing insights into active stellar nurseries in galaxies 10 billion years old.
Researchers identified two protostars located just a few light-years from the Milky Way's central black hole, defying expectations that gravitational tides would prevent star formation. The discovery suggests molecular gas at the galactic center is denser than previously thought, allowing it to form new stars.
The Hubble Space Telescope is set to undergo its fifth and final service mission, which will provide the telescope with a future as bright as its past despite being nearly 18 years into troubled beginnings. The repairs will upgrade instruments, replace gyroscopes and heat shields, and add new capabilities for deeper observations.
Astrophysicists used new computer visualization technology to understand that gravity plays a more significant role than previously thought in deep space's star-forming molecular clouds. The research, led by Alyssa Goodman, reveals hierarchical structure and density variations within these clouds.
The University of Virginia is conducting a new project, APOGEE, as part of the Sloan Digital Sky Survey III to study the chemical and dynamical fingerprints of Milky Way red giant stars. The team aims to understand the assembly of the Milky Way galaxy and its evolution.
Astronomers have discovered carbon dioxide on a Jupiter-sized planet orbiting another star, HD 189733b. The detection is significant as it could be a sign of biological activity, and further studies will focus on characterizing the planet's atmosphere to determine its habitability.
The Extended Submillimeter Array (eSMA) enables the study of the formation of new stars and planets using submillimetre light. Post-doc Sandrine Bottinelli used the telescope to determine the ratio of atomic to molecular carbon in an extremely distant galaxy.
A team of scientists used a natural cosmic lens to capture an image of a distant galaxy in the early Universe. The image shows a massive reservoir of gas and a supermassive black hole feeding a burst of star formation, indicating that the galaxy has collided with another.
Researchers have discovered two distant galaxies with massive black holes at their centers, challenging previous assumptions about the formation of these cosmic objects. The study reveals that these colossal black holes were present even 12 billion years ago, when the universe was just 1.7 billion years old.
Astronomers used gravitational lensing and adaptive optics to observe a young star-forming galaxy, finding clear signs of orderly rotation and evidence for a spiral disk with a central nucleus. The study demonstrates the power of future telescopes like the Thirty Meter Telescope.