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Astrophysics & Cosmology
Black holes, dark matter, gravitational waves, and the big‑picture universe.
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Dark energy may be changing, and 3,000 exploding stars are adding to the mystery - AOL
1+ hour, 47+ min ago (985+ words) Dark energy is the name for whatever pushes the universe apart faster and faster, and the standard picture treats its strength as fixed. At the University of Queensland, astronomers have now rebuilt three decades of exploding stars into one catalog,…...
Two L-shaped detectors sit 3,002 kilometres apart in Louisiana and Washington, each built to measure a change smaller than one ten-thousandth of a proton’s width—and after an eight-year initial search and a major rebuild, they finally recorded two black holes merging
1+ hour, 49+ min ago (35+ words) A century after Einstein predicted them, scientists finally caught the violent collision of two black holes by detecting ripples in spacetime itself—a measurement so exquisite it required rethinking how to listen to the universe....
A quantum leap in sound has been observed in real time for the first time
8+ hour, 52+ min ago (708+ words) This is not a single sound that can be heard. A phonon is a quantum of the coordinated motion of a large number of atoms. On a normal scale, the oscillations appear to decay smoothly, but at the quantum level,…...
Galaxies in the early universe are weird. These stars may explain why
4+ hour, 14+ min ago (1161+ words) New Hubble TEMPOS survey of 29 massive stars in extremely metal-poor galaxies finds unexpectedly weak stellar winds and delivers the largest-ever dataset of its kind, which could reshape our understanding of how galaxies formed in the early universe The relative size…...
Can Planets Form Around Supermassive Black Holes?
8+ hour, 54+ min ago (1239+ words) Planets are usually associated with stars, but the physics of planet formation may not be limited to star systems. In a recent SETI Live conversation, SETI Institute research scientist Dr. Lauren Sgro spoke with astrophysicists Dr. Bhupendra Mishra and Dr....
Large Hadron Collider is still on the hunt for short-lived quantum black holes and a theory of everything
4+ hour, 52+ min ago (727+ words) "You don't often have a situation which is really tiny but also extremely heavy." The discovery of such objects could help solve some of the mysteries surrounding the structure of space and time, united as a four-dimensional entity called "spacetime....
The strange 2% rule: Why black holes suddenly switch on their powerful jets
5+ hour, 58+ min ago (161+ words) A new study reveals black holes become predictable when feeding. Jets emerge when accretion rates fall to two percent of the Eddington limit. This threshold applies to black holes of vastly different sizes. Tidal disruption events offer a rare view…...
Biggest Supernova Dataset Yet Challenges Dark Energy Theory
6+ hour, 30+ min ago (630+ words) Nearly 3,000 exploding stars have revealed a startling possibility: the mysterious force accelerating the universe may be changing over time. The largest catalog of Type Ia supernovae assembled so far is giving astronomers a more detailed record of cosmic expansion. The…...
Researchers Link Spacetime Detectors Via Holographic Duality
9+ hour, 31+ min ago (647+ words) Can entanglement be harvested between quantum detectors located on opposite sides of a holographic boundary? Calculations now demonstrate this is possible, quantifying entanglement generation to quadratic order in the coupling constant λ. This establishes a connection between local detectors within…...
Black Holes May Create Stars Rather Than Just Destroy Them
7+ hour, 50+ min ago (323+ words) BGNES Active supermassive black holes may be drivers of star formation rather than agents of destruction, according to a new study reported by Smithsonian Magazine Scientists have mapped the structure of nine bright galactic nuclei relatively close to the Milky…...