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Hubble Constant Mystery Deepens: New Global Study Achieves Most Precise Measurement Yet Breaking in Measuring the Universe's Expansion Rate An international collaboration of cosmologists has united leading expertise to establish a consistent framework for measuring the Hubble constant . Detailed in Astronomy & Astrophysics, this achievement could help explain why the universe seems to be expanding more rapidly than current cosmological models suggest. Understanding the Hubble Constant and Cosmic Expansion Observations of distant galaxies reveal a clear trend: the further a galaxy is, the faster it moves away from us. This near-linear relationship is defined by the Hubble constant , a key value that describes the present rate of expansion of the universe. It also serves as a crucial tool for estimating the time since the Big Bang, forming the basis of our current understanding of the universe's age. The Hubble Tension: A Major Cosmic Mystery Despite its apparent simplicity, ...

Record-Breaking Gamma-Ray Burst Lasts Seven Hours, Challenging Astronomers Understanding of Cosmic Explosions Among the universe's most powerful phenomena are gamma-ray bursts — cosmic explosions capable of releasing, in a split second, more energy than the Sun will emit over its entire ten-billion-year existence. Normally, these intense flashes disappear almost immediately, lasting seconds or at most, a few minutes. However, on 2 July 2025 , astronomers detected an event that defied every expectation. Instead of ending quickly, the signal persisted for seven hours , produced three distinct bursts throughout a single day and left behind a glowing aftereffect that continued for months. The moment it was observed, scientists recognized that this was no ordinary gamma-ray burst . Explore more space science discoveries: SETI Study Reveals Space Weather Could Be Hiding Alien Signals From Earth GRB 250702B — The Longest Gamma-Ray Burst Ever Observed The phenomenon, designated GRB 250702...

Supermassive Black Hole Binaries May Exist in Ultra-Dense Cosmic Environments, New Study Reveals Scientists studying the universe's most mysterious regions have uncovered surprising evidence about the extreme environments surrounding supermassive black hole pairs . A groundbreaking study published in Nature Astronomy suggests that galactic centers hosting these cosmic giants could be packed with extraordinary densities of stars and dark matter . The research relies on advanced observations using pulsar timing arrays , offering astronomers a new method to investigate places are otherwise impossible to study directly. Highlights of the Discovery Researchers studied gravitational waves detected through pulsar timing arrays (PTAs) Galactic centers around supermassive black hole binaries may contain  ~ 1 million solar masses per cubic parsec A faint cosmic gravitational-wave hum was detected across the universe Environmental interactions may influence how black holes merge The findin...

Dark Matter May Replace Black Hole at the Milky Way's Core, Astronomers Suggest New Astronomical Research Challenges Long-Held Assumptions about Sagittarius A* Astronomers suggest that the heart of the Milky Way may not host a supermassive black hole, but instead a vast concentration of enigmatic dark matter producing an equivalent gravitational pull. They argue that this unseen material — believed to account for most of the universe's mass — can explain both the intense motions of stars just light-hours from the galactic center and the smoother, large-scale rotation of matter across the Milky Way's outer regions. The findings were published yesterday in Monthly Notices of the Royal Astronomical Society . Rethinking the Milky Way's Dark Heart The findings challenge the prevailing view that Sagittarius A* (Sgr A*) , the proposed black hole at the center of our galaxy, governs the motion of the so-called S-stars — stellar objects that race around the core at staggering ...

Astronomers Discover Mysterious Iron Bar Hidden Inside the Ring Nebula Mysterious Iron Cloud Revealed by European Research Team Astronomers from University College London and Cardiff University have uncovered a mysterious bar-shaped cloud of iron hidden within the famous Ring Nebula. The discovery was made by a European research team. First-Ever Detection of an Iron Structure Inside the Ring Nebula Reported for the first time in Monthly Notices of the Royal Astronomical Society , the structure consists of iron atoms arranged in a narrow bar or strip. It sits neatly inside the nebula's inner layer, an elliptical region well known from images captured by telescopes including the James Webb Space Telescope (JWST) at infrared wavelengths. Related space science coverage Size and Mass of the Iron Cloud The iron bar stretches to a length around 500 times the size of Pluto's orbit around the Sun and the researchers estimate that its total iron mass is comparable to that of Mars . A ...

Colossal Black Hole Caught Shredding a Massive Star in Rare Cosmic Event Known as the 'Whippet' A colossal black hole has been caught tearing apart a massive star , likened by scientists to " preparing a snack for lunch ", during observations presented at the American Astronomical Society's annual meeting held from 4-8 January . Astronomers across the globe witnessed the dramatic cosmic encounter , which was reported at the AAS conference in Phoenix, Arizona . The doomed star was described as being ripped apart and consumed piece by piece by black hole's overwhelming gravitational pull . More breaking space discoveries Scientists Describe an Exceptionally Rare Stellar Destruction Speaking at the conference, Associate Professor of Astrophysics Daniel Perley of Liverpool John Moores University , lead author of a forthcoming paper in Monthly Notices of the Royal Astronomical Society , said: "We believe we have identified a black hole merging with a mass...