A groundbreaking study reveals that the first stars formed at the start of the Universe depend on dark matter's nature. The research suggests that some of these primordial stars can still be found in the Milky Way galaxy today.
The universe's earliest stars, formed in warm dark matter strings, could help clarify whether the universe is made of warm or cold dark matter. These ancient stars would have formed in long filaments and could provide new insights into dark matter's energy and its impact on galaxy formation.
Astronomers found a gigantic hole in the Universe, spanning nearly a billion light-years, empty of stars, galaxies, gas, and dark matter. The void's existence was confirmed by studying data from the NRAO VLA Sky Survey, which revealed a significant drop in galaxy count in a region southwest of Orion.
A new study using Chandra finds that younger, more distant galaxy clusters contain far more actively growing supermassive black holes than older, nearby ones. This rapid growth allows these black holes to thrive and influence their host galaxies.
The Gruber Cosmology Prize has been awarded to Saul Perlmutter, Brian Schmidt, and their teams for discovering the accelerating expansion of the universe, dominated by mysterious dark energy. The breakthrough was made possible through innovative techniques using distant Type Ia supernovae as standard candles.
Researchers using Loop Quantum Gravity theory find a contracting universe before the Big Bounce, with space-time geometry similar to today's. A new mathematical model allows for precise analytical solutions and reveals a 'cosmic forgetfulness' due to extreme quantum forces during the Big Bounce.
The ATLAS upgrade, called CARIBU, will enable researchers to accelerate beams of short-lived radioactive isotopes and study unstable nuclei. This will help scientists better understand the universe's heavy elements, including those created in supernovae explosions.
A paper by Lawrence Krauss and Robert Scherrer suggests that matter will dominate over radiation in an ever-expanding universe dominated by dark energy. This means that ordinary matter particles, such as protons and neutrons, will remain stable for trillions of years, potentially allowing life to endure forever.
Art McDonald and his SNO team have won the Benjamin Franklin Medal in Physics for their discovery that neutrinos change flavour and have mass, modifying the Standard Model of particle physics. The award recognizes their outstanding scientific achievement in understanding the nature of matter and the universe.
Astrophysicists at the University of Illinois propose a new method to measure the fine-structure constant using relic radiation from the birth of the universe. This technique could help explain dark energy and constrain a
Researchers used COSMOS field data to measure large-scale distribution of matter, revealing concentration of luminous and dark matter. The 3D map provides insight into the formation and evolution of galaxies and may shed light on dark energy.
According to physicist Andrei Linde, recent developments in cosmology have changed our understanding of the structure and fate of the universe. Inflationary theory suggests that our universe could emerge from as little as a milligram of matter or even nothing, with quantum fluctuations creating galaxies along the way.
Physicist Cheng Chin creates a vacuum chamber in his laboratory that can reach billionths of a degree above absolute zero, simulating the conditions after the big bang. The experiment aims to explore the formation of galaxies and understand the origin of complex structures in the universe.
Researchers propose explanation for formation of dwarf spheroidals, faint galaxies composed almost entirely of dark matter. Simulations suggest environmental effects, including ram pressure and tidal shocking, strip away luminous matter, leaving behind dark-matter shadow.
Researchers at University of Wisconsin-Madison devise approach to 'see' extra dimensions by deciphering cosmic energy released in the universe's violent birth. The method provides evidence for testing string theory's existence and predicts specific shapes for the six hidden dimensions.
Cosmic superstrings, predicted by string theory, are thought to be ultra-thin tubes of energy left from the universe's beginning. They can emit gravitational waves as they decay, adding a new soundtrack to astronomy's silent movie.
Computer simulations show that supermassive black hole (SMBH) triple interactions occur frequently, even in the present-day universe. These violent encounters can lead to SMBH binaries being kicked out of galaxies and wandering through space.
Astronomers have created the first 3D map of the universe's dark matter distribution, revealing a web-like structure that confirms conventional theories on how galaxies formed. The map was derived from the Cosmic Evolution Survey and offers unprecedented detail on the large-scale filamentary structure of dark matter.
Physicists at UCR have detected the top quark, the heaviest known elementary particle, for the first time without its antimatter partner, allowing them to study its properties and production process. The discovery has significant implications for understanding the fundamental nature of the universe and how objects acquire mass.
Researchers using NASA's Hubble Space Telescope found dark energy was present and accelerating the universe's expansion at least 9 billion years ago. This discovery provides a crucial clue to understanding dark energy's strength and permanence.
Astrophysicists have resolved a long-standing issue with the Big Bang theory by studying gas movements in stars. Computer models revealed that low mass stars destroy helium 3 before it can be released into space, resolving the discrepancy.
George Smoot's discovery of miniscule temperature variations in the infant universe revealed a pattern consistent with the Big Bang theory. This finding, supported by subsequent experiments, confirmed the cosmos' origins and provided evidence for gravity's role in shaping the universe's structure.
A team of astronomers discovered that many large galaxies in the early universe had a low stellar birth rate, suggesting a cosmic 'birth control' mechanism that prevented excessive star formation. The study found that these galaxies formed stars when the universe was just 20% of its current age.
Researchers have found direct proof of dark matter's existence in a study using state-of-the-art telescopes. The team observed two merging galaxy clusters, revealing massive amounts of non-luminous matter that don't interact with normal matter.
An international team of astronomers has identified the dimmest stars in globular star cluster NGC 6397 using NASA's Hubble Space Telescope. The discovery provides clues to the age of the Universe and the formation time of one of its earliest generations of stars.
Scientists at Harvard University have recalculated the fine structure constant, a fundamental force that governs the electromagnetic interaction between charged particles. The new value suggests that atoms are slightly looser than previously thought, with an improved measurement accuracy of six times better.
The COBE experiments confirmed the universe was born in a big bang, shedding light on its structure. Variations in the CMB revealed tiny but regular temperature fluctuations that exist everywhere in the cosmos.
Researchers at Ohio State University have discovered a new method for calculating intergalactic distances, which implies that the Hubble constant may be significantly off the mark. The Triangulum Galaxy is estimated to be 15% farther away from our galaxy than previously measured, potentially making the universe 15% bigger and older.
Researchers recreated quark-gluon plasma at RHIC, studying matter in its earliest form and gaining insights into the universe's evolution. The project also improves nuclear equipment training for young researchers, with applications in cancer radiotherapy and material analysis.
Saul Perlmutter, Adam Riess, and Brian Schmidt share the prize for their work on measuring changes in the universe's expansion rate. Their discovery has implications for understanding dark energy and its impact on galaxy distances.
Adam Riess, a 36-year-old astronomer at Johns Hopkins University, has won the $1 million Shaw Prize for his work on dark energy, a phenomenon that accounts for 70 percent of the universe. He shares the award with Saul Perlmutter and Brian Schmidt, who worked on competing teams to measure the expansion rate of the universe.
Researchers found massive-star supernovae to be major space dust factories, producing up to seven thousand earth masses of solid dust particles. This discovery challenges existing theories and provides new insights into the processes that produce dust in the universe, with implications for the formation of comets, planets, and life.
A team of scientists at the University of Chicago has verified the main features of the cold dark matter model by comparing supercomputer simulations to recent astronomical observations. The simulations accurately reproduced the distribution of galaxies in the early stages of the universe's evolution.
Researchers predict that braneworld black holes, created in the early universe, have survived and can be detected by observing gamma-ray bursts passing near them. The signature of these black holes could provide evidence for a fourth dimension of space.
Researchers have created a massive 3-D map of the universe, mapping the distribution of galaxies and providing new insights into dark energy. The map uses luminous red galaxies as 'lighthouses' to measure distances, covering vast scales of up to a billion light-years across.
A team of researchers at Penn State has discovered a mathematical description of a contracting universe that existed before the Big Bang, with space-time geometry and gravity exhibiting unique properties. The findings rely on loop quantum gravity theory, which proposes a discrete 'atomic' structure to space-time.
A Cornell University study reveals that galaxies in the early universe tend to cluster near large clumps of dark matter. The research uses data from the Spitzer Wide-area InfraRed Extragalactic survey and confirms that ultraluminous infrared galaxies are precursors to galaxy clusters.
CDF collaboration presents first precise measurement of matter-antimatter transition rate, oscillating at 3 trillion times per second, using Tevatron Run II data. Scientists hope to understand the early universe and role of exotic bottom quarks in its development.
The MINOS experiment has confirmed that neutrinos are not massless, with a mass difference of 0.056 eV between two types measured. This discovery opens up a new field of study to understand the universe's formation and disappearance of antimatter.
Researchers have discovered the Universe's strongest magnetic field, generated by violent collisions between neutron stars. The discovery sheds light on the mysterious short Gamma-ray bursts, which are the most powerful explosions in the universe. Scientists believe that strong magnetic fields play a crucial role in their formation.
Scientists have new evidence for the 'inflation' scenario that describes the universe's sudden growth from submicroscopic to astronomical size in its first trillionth of a second. The WMAP satellite data show a faint polarization signal, which was weaker than expected, but still supports the inflation prediction.
Researchers analyze gamma-ray burst GRB 050904 to understand the conditions of the early universe. The burst, detected in 2005, provides a probe to study the universe beyond the reach of large telescopes.
Astronomers have detected ionizing radiation leaking from a dwarf galaxy undergoing star formation, providing insights into the early universe's evolution. The study suggests that hot stars in Haro 11 allowed for some ionization to escape into intergalactic space.
A study using hundreds of images from two deep sky surveys found that more than half of the largest galaxies in the nearby universe have collided and merged with another galaxy. The mergers occur quickly, leaving faint features difficult to detect, but confirm predictions for large-scale structure formation. Ongoing study will reveal i...
Researchers confirm that Einstein's cosmological constant behaves like dark energy, driving the acceleration of the universe. The study uses innovative imaging data from the Supernova Legacy Survey, which reveals a precision of 10% and challenges theoretical ideas about dark energy.
Physicists Andreas Karch and Lisa Randall propose that the relaxation principle in the early universe led to the formation of three- or seven-dimensional realities. These dimensions could be hidden from our perception, with our three-dimensional reality being just one of them.
A team of astronomers has discovered a large population of galaxies formed between 9 and 12 billion years ago, contradicting previous estimates that the Universe had not yet formed many stars in the first billion years. The findings suggest that stars formed two to three times faster than previously thought.
A team led by Neil Gehrels' Swift science team detected the afterglow of a gamma-ray burst (GRB) with a redshift of 6.29, confirming Lamb and Reichart's earlier prediction from 1999. This discovery smashes the old distance record by 500 million light years.
A team of scientists led by Alan E.E. Rogers successfully detected deuterium using a radio telescope array, a significant breakthrough in understanding the universe's origins. The detection has implications for understanding dark matter and cosmic baryon density.
The team developed statistical techniques to analyze WMAP data, helping confirm the Big Bang theory and offering insights into the universe's shape, composition, and fate. Their approach allows for separation of data information from model assumptions, providing a more accurate understanding of the cosmos.
A study suggests that abandoning livestock can significantly reduce global warming, with animal agriculture emitting 21% of all human-caused carbon dioxide. This shift in diet would have no adverse effects on health and could potentially meet Kyoto treaty targets for reducing emissions.
Scientists at Ohio State University discovered that bumpy surfaces on interstellar dust grains can explain the formation of molecular hydrogen, the most abundant element in the universe. By simulating different surfaces, researchers found that only bumpy textures enable two hydrogen atoms to bond in space.
The Millennium Run simulation recreated evolutionary histories for 20 million galaxies and supermassive black holes, clarifying physical processes underlying galaxy buildup. The study also demonstrated that characteristic patterns imprinted on matter distribution at early epochs are still present in observed galaxy distributions.
Researchers using the DEEP2 Galaxy Redshift Survey observe a fundamental constant unchanged over 7 billion years. The fine structure constant affects atomic interactions and light emission, with no variation detected in distant galaxies.
Recent studies of the cosmic microwave background radiation suggest that small black holes were widespread in the early universe and merged to form larger black holes. This finding could indicate an era in which small black holes were commonplace, with potential telltale evidence in galaxies without a central supermassive black hole.
A team of researchers has found evidence of dark energy in the universe's cosmic neighborhood, with billions of galaxies emerging from a sea of dark energy. The findings provide supporting evidence for the presence of dark energy, which is causing the universe to accelerate in expansion.
Cosmologists propose that the universe's acceleration can be explained by inflationary theory, which generates cosmic ripples that drive expansion. This solution relies on Einstein's General Relativity and doesn't require new ingredients like dark energy.
Researchers found that rotating black holes can cause negative refraction in electromagnetic radiation, affecting our knowledge of the universe. This discovery highlights the importance of considering gravitational forces when studying the origin of the universe.
A team of astronomers has discovered a remote galaxy cluster that is as massive as several thousand galaxies like our Milky Way and is located 9,000 million light-years away. The cluster contains reddish and elliptical galaxies with old stars, indicating it formed when the Universe was less than one third of its present age.
Researchers are exploring alternative explanations for dark energy, including the possibility of modified gravity laws and a multiverse. String theory suggests that the value of the cosmological constant may be very small, while another speaker proposes using