Tag

Astrophysics

All articles tagged with #astrophysics

science28 days ago•4 min saved

Blazar Jets as Cosmic Neutrino Engines? New Record Points to Extreme Galaxies

A Mediterranean KM3NeT/ARCA detector captured a 220 PeV neutrino—the most energetic yet—sparking a study that points to blazars (jets from supermassive black holes aligned toward Earth) as likely accelerators. The team cross-checked with IceCube and Fermi data and noted no electromagnetic counterpart, suggesting a diffuse background of multiple sources rather than a single cataclysmic event. With KM3NeT expanding to full size, researchers expect more high-energy neutrinos to sharpen the origin story.

via ScienceAlert|

#astrophysics #blazars #km3net

science1 month ago•2 min saved

Is the Universe a Computer? Tyson Sparks the Simulation Debate

Neil deGrasse Tyson suggests the universe could be a simulation created by an advanced civilization, while Melvin Vopson argues that signs in physics—especially information entropy and the need for data compression—could support that claim; though the idea remains controversial and not widely accepted, it continues to fuel debate on whether reality is ultimately computable.

via supercarblondie.com|

#astrophysics #data-compression #information-entropy

space1 month ago•4 min saved

Milky Way Center Signals Point to Excited Dark Matter

Astronomers say a single excited dark matter model could explain three puzzling signals from the Milky Way's center—the 511-keV gamma-ray line, a 2 MeV continuum, and unusually high ionisation in the Central Molecular Zone—potentially guiding future space missions to test dark matter behavior.

via BBC Sky at Night Magazine|

#astrophysics #dark-matter #excited-dark-matter

science1 month ago•8 min saved

128 New Gravitational-Wave Signals Redefine Black Hole Demographics

The LVK collaboration released Gravitational-Wave Transient Catalog 4.0 (GWTC-4), adding 128 new gravitational-wave candidates detected from 2015–2024, more than doubling the catalog. The expanded set reveals a wider variety of black-hole binaries, including very massive and rapidly spinning systems, enabling tests of general relativity and new measurements of the universe’s expansion (via the Hubble constant). This growth pushes gravitational-wave astronomy into new regions of parameter space and promises deeper insights into black-hole formation and cosmic evolution.

via The Daily Galaxy|

#astrophysics #black-holes #gravitational-waves

science1 month ago•3 min saved

Stormy Space Weather Could Hide Alien Signals, SETI Finds

SETI researchers warn that solar storms and plasma turbulence around stars can broaden and weaken ultra-narrow radio signals from potential alien transmitters, making them harder to detect with traditional searches and prompting researchers to rethink observation strategies, including higher-frequency surveys; the finding explains, in part, why technosignature signals remain elusive while suggesting aliens might still be out there.

via The Guardian|

#astrophysics #extraterrestrial-life #radio-astronomy

space2 months ago•5 min saved

Longest Gamma-Ray Burst Rewrites Rules on Cosmic Explosions

Astronomers detected GRB 250702B, a gamma-ray burst lasting about 25,000 seconds (roughly seven hours)—the longest on record—observed by multiple space-based telescopes since mid-2025; its sustained, evolving profile challenges standard GRB classifications and may point to a helium-star merger with a stellar-mass black hole, while no redshift or host galaxy has been identified yet. The finding highlights potential detection biases against long, lower-brightness bursts and has spurred plans to revise criteria for future missions like NASA/ESA’s COSI and to re-examine archival data for overlooked events.

via The Daily Galaxy|

#astronomy #astrophysics #binary-stars

science2 months ago•5 min saved

Ultra-Powerful Neutrino Sparks Dark Matter Clue From Ancient Black Hole

A 220 PeV neutrino detected by KM3NeT's ARCA detector in February 2023 far exceeds energies from any accelerator and challenges existing models; a University of Massachusetts Amherst team suggests it came from a primordial black hole evaporating via Hawking radiation, offering a potential link to dark matter and a window into new physics beyond the Standard Model.

via The Daily Galaxy|

#astrophysics #dark-matter #km3net

science2 months ago•5 min saved

Runaway Black Holes: Cosmic Rockets Leaving Galactic Trails

Astronomers say runaway black holes—spun up by mergers—can be ejected at thousands of km/s, leaving straight contrails of stars as they zip through galaxies. Recent JWST observations in 2025 show potential evidence: a ~10-million-solar-mass hole moving ~1,000 km/s with a ~200,000-light-year contrail and another ~2-million-solar-mass hole in NGC3627 at ~300 km/s with a ~25,000-light-year trail. While these events are rare, such runaways could travel between galaxies, and, in theory, even pass through our Solar System, though the odds are extremely small.

via The Conversation|

#astrophysics #black-holes #galaxies

science2 months ago•26 min saved

FAST telescope uncovers binary-origin clue for some fast radio bursts

An international team using China's FAST (Five-hundred-meter Aperture Spherical Radio Telescope) in Guizhou monitored the repeating FRB 20220529 and observed a sudden change in Faraday rotation, signaling interaction with dense plasma and supporting the idea that at least some fast radio bursts originate in binary systems; the bursts release energy equivalent to the Sun’s output over a week, marking a significant advance in understanding FRB origins.

via Ground News|

#astronomy #astrophysics #fast

science3 months ago•3 min saved

Scientists Challenge Einstein's Speed Limit

Scientists tested the possibility of breaking Einstein's speed of light rule by examining high-energy gamma rays from distant cosmic sources. Their findings confirmed Einstein's predictions, setting tighter limits on potential violations of Lorentz invariance and advancing our understanding of fundamental physics, though the quest to unify quantum theory and gravity continues.

via ScienceDaily|

#astrophysics #einstein #lorentz-invariance

science3 months ago•3 min saved

Is the Universe Headed for a 'Big Crunch' as Dark Energy Changes?

A new study suggests that dark energy may be weakening, potentially leading to a reversal of the universe's expansion and a catastrophic collapse into a Big Crunch, challenging long-held scientific beliefs and sparking debate among astrophysicists.

via The Daily Galaxy|

#astrophysics #big-crunch #cosmology

science3 months ago•6 min saved

Astronomers Seek Exotic Dark Matter Clues in Space

Scientists propose using the Gaia space telescope to search for exotic dark matter objects like boson stars and Q-balls through microlensing, which could reveal their presence or set limits on their contribution to dark matter, potentially transforming our understanding of the universe's unseen mass.

via Space|

#astrophysics #dark-matter #exotic-objects

science3 months ago•3 min saved

Zombie Stars Could Illuminate Dark Matter Mysteries

Researchers from the University of British Columbia explored the potential link between axions, a dark matter candidate, and white dwarf stars, using data from the Hubble Space Telescope. Although their analysis did not find evidence of axion-induced cooling, it established new limits on axion-electron interactions, guiding future dark matter research. The study highlights the importance of exploring various astrophysical phenomena to understand elusive particles like axions.

via Gizmodo|

#astrophysics #axions #dark-matter

science3 months ago•3 min saved

Supercomputers Unveil the Mysteries of Black Hole Environments

A new study using supercomputers has produced the most detailed simulations to date of how stellar-mass black holes consume and eject matter, incorporating complex physics and general relativity, revealing insights into the behavior of accretion disks, jets, and magnetic fields around black holes.

via ScienceAlert|

#accretion-disks #astrophysics #black-holes

science3 months ago•3 min saved

Supercomputers Unveil Black Hole Secrets

A new study using supercomputers has produced the most detailed simulations to date of how stellar-mass black holes consume and eject matter, incorporating complex physics and general relativity, which could also apply to supermassive black holes and help explain recent astronomical observations.

via Yahoo|

#accretion-disks #astrophysics #black-holes