New simulations of 15,000 stellar streams suggest galaxies can create features once thought to be evidence of dark matter, narrowing the search for it. For years, astronomers have looked to the long, ribbon-like stellar streams wrapping around the...

are scarce, the team generated realistic mock spectra by merging actual quasar observations with those of background galaxies. These synthetic composites taught the neural network to recognize the emission‑line patterns that betray a quasar acting as a...

into the early universe and serves as a powerful new diagnostic tool for probing the diffuse matter distributed between galaxies. A Deep-Space Echo from the Early Universe Designated FRB 20240304B, the signal belongs to the enigmatic category of fast...

combination of gravitational tidal forces and potential ram pressure as the primary drivers of this disruption. As the two galaxies pass one another, the LMC’s gravitational influence likely stretches the SMC, while interactions with gas in the...

Interaction The proximity of Centaurus A makes it an ideal test case for exploring how massive black holes and their host galaxies co‑evolve. Energy released by the central engine can compress gas, fostering new star formation, yet powerful outflows can...

a heftier black hole. Yet the first JWST data produced several outliers whose inferred masses dwarf those of comparable galaxies nearby. A further puzzle is the near‑absence of X‑ray emission from many of these early‑universe sources. Active black holes...

significant fraction of the meal may never reach the black hole at all, changing our understanding of how binary stars in galaxies evolve.” Revising the Role of Black Holes in Galactic Environments The expelled gas may rival the amount ultimately...

collision adds a new data point for probing the transition from a primordial plasma to the familiar matter that composes galaxies, planets and living beings. New CERN Data Illuminate the Behavior of Early‑Universe Matter According to CERN, teams across...

fraction of the Universe’s matter can be seen directly. Roughly fifteen percent consists of ordinary particles that form galaxies, stars and interstellar gas, while the remaining mass appears to be composed of dark matter, a substance inferred from its...

The telescope will also map the influence of dark matter, whose gravitational pull can be inferred from the way galaxies cluster and evolve over time. Large‑scale observations from Roman will enable researchers to trace how dark matter shapes the...

spacetime, bending the trajectories of passing photons. Galaxy clusters, which combine dark matter, hot gas, and countless galaxies, generate some of the strongest gravitational lenses in the cosmos. When a distant galaxy aligns behind such a cluster,...

The research suggests that the merger occurred roughly 70 million years ago, following the collision of two progenitor galaxies of comparable mass. The presence of high spin in at least one of the original black holes implies a history of prolonged gas...

A Statistical Approach to Cosmic Mapping Typically, astronomers track cosmic structures by pinpointing individual galaxies, a process that becomes increasingly difficult as the distance from Earth grows. Hydrogen intensity mapping changes the game by...

for further expansion. The simulations suggest a different mechanism: within overdense protoclusters, nearby star-forming galaxies generate intense far-ultraviolet radiation. This radiation disrupts molecular hydrogen, which acts as a cooling agent for...

NASA science mission director Nicky Fox noted that the telescope will catalog tens of thousands of planets, billions of galaxies, and tens of billions of stars, performing tasks that were previously impossible at this scale. “Roman’s vast reach will...

of the galaxy, astronomers are gaining a clearer picture of the complex feedback loops that govern the life cycles of galaxies across the universe.

controversial. In addition, certain radio signals, known as Fast Radio Bursts (FRBs), have been detected from distant galaxies. While these bursts are not yet understood, some speculate that they could be of artificial origin. The proof of alien life...

very red objects nicknamed little red dots, or LRDs. At first glance these sources look like tiny, extremely compact galaxies dominated by old stars, but that interpretation raises hard problems for galaxy formation theory: the implied stellar masses...

light and a torrent of neutrinos. While photons are absorbed or scattered by interstellar matter, neutrinos sail through galaxies and planets virtually unimpeded, preserving a record of the explosions that generated them. Over billions of years these...

a Cosmic Giant Galaxy clusters rank among the largest gravitationally bound entities, comprising hundreds to thousands of galaxies, expansive reservoirs of hot gas, dark matter, and tangled magnetic fields. Although the presence of magnetism in these...