All articles tagged with #cosmological models
A new theoretical model suggests the universe may start collapsing in about 10 billion years, significantly sooner than previous estimates, due to the potential negative value of dark energy, which could lead to a Big Crunch. However, the true fate of the universe remains uncertain, with other theories proposing much longer timelines or different end scenarios.
The COSMOS-Web project using the James Webb Space Telescope has created the largest map of the universe, revealing nearly 800,000 galaxies across 98% of cosmic history. Unexpectedly, it shows more galaxies and supermassive black holes in the early universe than predicted, challenging existing cosmological models and raising new questions about galaxy formation and the universe's evolution.
Astrophysicists have uncovered how massive elliptical galaxies form, using data from the Atacama Large Millimeter/submillimeter Array (ALMA). Contrary to previous beliefs that these galaxies evolved from rotating discs, the study found that early star-forming galaxies were already spherical. This transformation is attributed to intense, short-lived star formation episodes driven by cold gas streams and galaxy mergers. The findings, published in Nature, enhance our understanding of galaxy formation and evolution, with future observations expected to provide further insights.
Scientists are using artificial intelligence (AI) to better understand dark energy, the mysterious force driving the universe's accelerated expansion. By employing AI techniques to create a supercomputer simulation of the universe, researchers have achieved unprecedented precision in measuring dark energy, doubling the precision compared to traditional methods. This approach has provided insights into the dynamics of dark energy and validated certain models of cosmic evolution while ruling out others. However, the mystery of dark energy and the cosmological constant remains, as the vast disparity between theory and observation persists. Nonetheless, the use of AI in analyzing simulated models of the universe shows promise in uncovering important clues about dark energy.
Astronomers using the Subaru Telescope have directly detected Dark Matter filaments in the massive Coma Cluster, providing new evidence for the structure of the Universe. These filamentary structures, spanning millions of light years, were observed for the first time, offering a means to test cosmological theories and understand the evolution of the Universe.
A study using Sloan Digital Sky Survey data suggests that the Universe may be younger than previously estimated, challenging conventional cosmological models. By analyzing satellite galaxy motions around massive groups, researchers found a notable excess of pairs exhibiting correlated velocity offsets, indicating the presence of recently accreted or infalling satellite galaxies. This discrepancy between observations and simulations implies that massive galaxy groups are younger in the real Universe, presenting a challenge to the current cosmological model and providing valuable insights into the Hubble tension problem.
A recent study using spectroscopic analysis from NASA's James Webb Space Telescope (JWST) has identified three potential dark star candidates, estimated to be much larger than our Sun and powered by the demolition of dark matter particles. If confirmed, these dark stars could challenge current cosmological models and provide insights into the early universe. Further observations are needed to validate these findings and understand the correlation between dark matter and the first stars of the universe.
Astronomers have discovered a peculiar galaxy, NGC 1277, that appears to lack dark matter, challenging our current understanding of the universe. Dark matter, which outweighs visible matter by almost six to one, is believed to play a crucial role in shaping galaxies. However, NGC 1277 seems to be an exception, with stars and matter in the galaxy moving solely under the influence of visible matter. This discrepancy poses a puzzle for the standard cosmological model and may also challenge alternative theories that attempt to explain the universe without invoking dark matter. Further observations are planned to investigate this cosmic mystery.
Scientists have discovered that the massive galaxy NGC 1277 does not contain dark matter, which challenges the currently accepted cosmological models. NGC 1277 is considered a relic galaxy, and its lack of dark matter is puzzling. Possible explanations include the gravitational interaction with the surrounding medium or the dark matter being driven out during the galaxy's formation. If confirmed, this finding would cast doubt on alternative models for dark matter. Further observations are planned to investigate this mystery.