Showing 20 articles starting at article 1061
< Previous 20 articles Next 20 articles >
Categories: Paleontology: General, Space: Structures and Features
Published Ancient helium leaking from core offers clues to Earth's formation


Helium-3, a rare isotope of helium gas, is leaking out of Earth's core, a new study reports. Because almost all helium-3 is from the Big Bang, the gas leak adds evidence that Earth formed inside a solar nebula, which has long been debated.
Published Mysterious death of carbon star plays out like six-ring circus


Scientists studying V Hydrae (V Hya) have witnessed the star's mysterious death throes in unprecedented detail. The team discovered six slowly-expanding rings and two hourglass-shaped structures caused by the high-speed ejection of matter out into space.
Published Researchers map the movement of white dwarfs of the Milky Way


White dwarfs were once normal stars similar to the Sun but then collapsed after exhausting all their fuel. These interstellar remnants have historically been difficult to study. However, a recent study reveals new information about the movement patterns of these puzzling stars.
Published Look! Up in the sky! Is it a planet? Nope, just a star



Among thousands of known exoplanets, astronomers have flagged three that are actually stars.
Published Scientists announce discovery of supermassive binary black holes


Researchers have discovered a supermassive black hole binary system, one of only two known such systems.
Published Black hole billiards in the centers of galaxies


Researchers provide the first plausible explanation to why one of the most massive black hole pairs observed to date by gravitational waves also seemed to merge on a non-circular orbit. Their suggested solution involves a chaotic triple drama inside a giant disk of gas around a super massive black hole in a galaxy far, far away.
Published Mathematical discovery could shed light on secrets of the Universe


How can Einstein's theory of gravity be unified with quantum mechanics? It is a challenge that could give us deep insights into phenomena such as black holes and the birth of the universe. Now, a new article presents results that cast new light on important challenges in understanding quantum gravity.
Published Event horizons are tunable factories of quantum entanglement



Physicists have leveraged quantum information theory techniques to reveal a mechanism for amplifying, or 'stimulating,' the production of entanglement in the Hawking effect in a controlled manner. Furthermore, these scientists propose a protocol for testing this idea in the laboratory using artificially produced event horizons.
Published Dark energy: Neutron stars will tell us if it's only an illusion


Scientists provide the first simulation of neutron star collisions in extensions of general relativity relevant for cosmology, offering a new approach to test gravity.
Published 'Closest black hole' system found to contain no black hole



In 2020, astronomers reported the closest black hole to Earth, located just 1000 light-years away in the HR 6819 system. But the results of their study were contested by other researchers. In a new paper, these two teams have united to report that there is in fact no black hole in HR 6819, which is instead a 'vampire' two-star system in a rare and short-lived stage of its evolution.
Published New simulations refine axion mass, refocusing dark matter search


Axions are today's most popular candidate for dark matter, and numerous experiments are trying to detect them in microwave cavities where the axion should rarely convert into an electromagnetic wave. But a new simulation of the production of axions in the early universe provides a more refined mass estimate, and higher frequency for the EM wave, that is outside the range of these experiments. The new mass comes from adaptive mesh refinement in supercomputer simulations.
Published Astronomers map mysterious element in space


A research team has provided an important clue to the origin of the element Ytterbium in the Milky Way, by showing that the element largely originates from supernova explosions. The groundbreaking research also provides new opportunities for studying the evolution of our galaxy.
Published Ancient dwarf galaxy reconstructed with MilkyWay@home volunteer computer


Astrophysicists for the first time have calculated the original mass and size of a dwarf galaxy that was shredded in a collision with the Milky Way billions of years ago.
Published Ultraprecise atomic clock poised for new physics discoveries


Physicists have made one of the highest performance atomic clocks ever. Their instrument, known as an optical lattice atomic clock, can measure differences in time to a precision equivalent to losing just one second every 300 billion years and is the first example of a 'multiplexed' optical clock, where six separate clocks can exist in the same environment. Its design allows the team to test ways to search for gravitational waves, attempt to detect dark matter, and discover new physics with clocks.
Published How galaxies can exist without dark matter


Astrophysicists report how, when tiny galaxies collide with bigger ones, the bigger galaxies can strip the smaller galaxies of their dark matter -- matter that we can't see directly, but which astrophysicists think must exist because, without its gravitational effects, they couldn't explain things like the motions of a galaxy's stars.
Published Distant galaxies and the true nature of dark matter


In conflict with the current prevailing theory used to describe the universe, a new study suggests the existence of a direct interaction between the elementary particles that make up the dark matter halo and those that make up ordinary matter.
Published Debris from disintegrating planets hurtling into white dwarfs across the galaxy


The moment that debris from destroyed planets impacts the surface of a white dwarf star has been observed. Astronomers saw X-rays from planetary debris heated to a million degrees as it fell onto the dead core of its host star.
Published Too many disk galaxies than theory allows


The Standard Model of Cosmology describes how the universe came into being according to the view of most physicists. Researchers have now studied the evolution of galaxies within this model, finding considerable discrepancies with actual observations.
Published Shadow of cosmic water cloud reveals the temperature of the young universe


Astronomers have found a new and original method for measuring the cosmic microwave background's temperature when the Universe was still in its infancy. They confirm in their new study the early cooling of our Universe shortly after the Big Bang and open up new perspectives on the elusive dark energy.
Published Assessing and optimizing the quality of sensor networks


When building sensor networks, it can be extremely challenging for researchers to determine how the sensors should be arranged to obtain optimal results. New research proposes a new way to quantify the quality of sensor networks, and uses this method to suggest improvements to existing Dark Matter experiments.