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Illustration depicting the discovery of a cosmic particle outflow from Westerlund 1, featuring a TeV ring detected by the H.E.S.S. telescope and a GeV gamma-ray signal located by the Fermi telescope. An unexplained "tail" connects these phenomena, illustrating high-energy electrons creating a nascent outflow.

Westerlund 1 is the biggest star cluster in our galaxy.

Westerlund 1 is the biggest star cluster in our galaxy. New data reveals it acts as a colossal particle accelerator, blasting a hole through the Milky Way's disk.

Dec 11, 20251 min read

Discovering the ancient supernova SN 2025wny, 10 billion light-years away, sheds light on dark energy. This cosmic explosion is exceptionally bright, with gravitational lensing by an intervening galaxy bending its light and creating multiple images. The varied light paths reveal crucial data, helping solve the Hubble tension by recalculating the universe's expansion rate.

A supernova from 10 billion years ago solved the mystery of the universe's expansion rate

A rare, magnified supernova from 10 billion years ago might finally solve the mystery of the universe's expansion rate. We know the universe is expanding, but we don't agree on how fast. This disagreement is called the Hubble Tension. Early Universe (CMB): Says ~67 km/s/Mpc. Late Universe (Supernovae): Says ~73 km/s/Mpc. SN 2025wny is a "Goldilocks" object. It's an independent test. By measuring the time delay between its lensed images, we can calculate the expansion rate d

Dec 11, 20251 min read

Recent studies highlight how interactions with cosmic environments cause galaxies to exhibit "S" and "U" shaped warps, driven by the clustering and alignment of satellite galaxies with cosmic filaments. This evidence points to cosmic tides as the key force shaping these large-scale structures.

Galaxies aren't always flat disks. Many are warped, bent by invisible forces.

Galaxies aren't always flat disks. Many are warped, bent by invisible forces. New research links these shapes to the satellite galaxies that surround them. Using data from the Sloan Digital Sky Survey, researchers led by Prof. Woong-bae Zee examined hundreds of warped galaxies. They compared them to a "control group" of flat galaxies. The goal: To see if the neighbors (satellite galaxies) had anything to do with the warping.

Dec 10, 20251 min read

Illustration depicting the confirmation of Einstein's century-old theory of frame-dragging, where a rapidly rotating black hole twists spacetime. The recent observation, AT2020afhd, involved a star being shredded in a tidal disruption event, displaying a consistent wobble every 20 days. Evidence was captured through X-ray and radio signals by Swift and the Very Large Array.

Scientists have watched a black hole drag the very fabric of spacetime around with it

For the first time, scientists have watched a black hole drag the very fabric of spacetime around with it, creating a "wobbling" vortex visible from Earth. The event AT2020afhd was a Tidal Disruption Event (TDE)—a star ripped apart by a black hole. But unlike normal TDEs, the X-ray and radio signals weren't steady. They rhythmically brightened and dimmed every 20 days.

Dec 10, 20251 min read

A cosmic event, GRB 250702B, shattered records with a 7-hour gamma-ray explosion, challenging existing scientific models and igniting debates on its origins—whether a dying star, a stellar collision, or a black hole shredding a star.

Astronomers have detected the longest-lasting gamma-ray burst in history

Astronomers have detected the longest-lasting gamma-ray burst in history. It defies standard models and hides within a dusty, massive galaxy. Gamma-ray bursts (GRBs) usually last just a few seconds (Short GRBs) or a few minutes (Long GRBs). They are blink-and-you-miss-it cataclysms. GRB 250702B lasted nearly seven hours.

Dec 10, 20251 min read

Witness the unprecedented ejection of matter at 20% the speed of light, observed over a 10-day period using a fleet of seven telescopes, including XRISM. Triggered by magnetic reconnection, this phenomenon, 10 billion times more powerful than a solar flare, shapes the evolution of entire galaxies.

Astronomers have witnessed a supermassive black hole hurling matter at 20% the speed of light

Astronomers have witnessed a supermassive black hole hurling matter at 20% the speed of light—driven not by heat, but by snapping magnetic fields. We usually think of black holes ejecting matter via radiation pressure (heat). But SRON researchers found something different: the outburst was driven by Magnetic Reconnection. This is the same mechanism that causes solar flares and Coronal Mass Ejections (CMEs) on our Sun. Magnetic field lines twist, snap, and reconnect, releasi

Dec 10, 20251 min read

Unusual Flare AT2022zod Attributed to Tidal Disruption Event in Ultra-Compact Dwarf Galaxy.

An unusually bright flare in a distant galaxy wasn't a supernova

An unusually bright flare in a distant galaxy wasn't a supernova. It was a star being ripped apart by a hidden black hole. The flare AT2022zod lasted just over a month. It was detected in an elliptical galaxy about 10,000 light-years from the center. Astronomers had to rule out the usual suspects. It was too bright and fast for a standard supernova. It wasn't the galaxy's central supermassive black hole (too far away).

Dec 10, 20251 min read

Scientists explore the early appearance of supermassive black holes less than a billion years after the Big Bang, attributing them to the rapid collapse of primordial "monster stars" in Galaxy GS 3073, detected through distinctive chemical signatures.

Astronomers have found the chemical fingerprints of the first "Monster Stars"

Astronomers have found the chemical fingerprints of the first "Monster Stars"—titans 10,000 times the mass of the Sun—solving the mystery of supermassive black holes. How do you get so much nitrogen? The answer lies inside stars weighing 10,000 times the mass of the Sun. In these titans, the core is so hot that the CNO Cycle (Carbon-Nitrogen-Oxygen) goes into overdrive.

Dec 10, 20251 min read

The infographic illustrates SN 2021ukt, a groundbreaking supernova that underwent a first-of-its-kind identity transition. Initially a Type IIn, it transformed into a Type Ib as its ejecta interacted with a dense hydrogen cloud. This significant shift marks a new understanding in supernova classification, emphasizing the unique nature of the progenitor star and its hydrogen envelope.

Astronomers have watched a supernova change its identity in real-time

Astronomers have watched a supernova change its identity in real-time, transitioning from Type IIn to Type Ib for the first time in history. Normally, supernovae are classified early and stay that way. SN 2021ukt broke the rules.

Dec 8, 20251 min read

New findings reveal that the chemical divide in star groups is influenced by inflowing metal-poor gas and starburst activity, challenging the old theory of galactic collisions. This discovery highlights diverse pathways in galactic evolution.

Why does the Milky Way have two distinct populations of stars?

Why does the Milky Way have two distinct populations of stars? New simulations reveal the turbulent chemical history of our home galaxy. Researchers from ICCUB and CNRS used the Auriga simulations to create 30 virtual galaxies. They wanted to see what cosmic events cause this chemical split. The Surprise: There isn't just one way to build a Milky Way. The study found multiple paths to the same outcome:

Dec 8, 20251 min read

"The double helium tails of WASP-121 b reveal an ultra-hot Jupiter with dynamic atmospheric features. Observed by JWST's NIRISS for over 37 hours, these tails challenge existing models and offer insights into planetary evolution."

WASP-121b: Scientists found a giant helium cloud wrapping halfway around its star

Scientists stared at WASP-121b for 37 hours straight. They found a giant helium cloud wrapping halfway around its star. WASP-121b is an "ultra-hot Jupiter." It hugs its star so tightly that a year lasts only 30 hours. The intense radiation boils the atmosphere, stripping away heavy gases like iron and magnesium, and lighter ones like helium.

Dec 8, 20251 min read

TRAPPIST-1 is small, cool, and throws temper tantrums six times a day.

TRAPPIST-1 is small, cool, and throws temper tantrums six times a day. New research reveals the "wimpy" but destructive physics behind these flares. Using models to "wind back time" on 6 flares observed by JWST, the team found the culprit: electron beams. Surprisingly, these beams were much weaker than expected. TRAPPIST-1's flares are produced by electron beams about 10 times weaker than those of similar M-dwarf stars.

Dec 7, 20251 min read

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