EurekAlert! Fig. 1. Schematic illustration. When an ultra-relativistic electron beam is incident into nonuniform plasma with an upramp density profile, the beam excites a nonlinear plasma wake, and strong beam pinching occurs due to the focusing wakefields. The focused dense beam,…
Newswise — A University of Portsmouth researcher has played a major role in an international research project that brings scientists closer to mapping the Universe. The MeerKLASS Collaboration has reported their first measurement of the large-scale clustering of cosmic hydrogen, advancing…
The same observations carry a second result. The atmosphere has largely recovered from the Great Dimming, the episode in which Betelgeuse faded to its faintest in more than a century of records. Gas that had turned unusually cool just before…
Recreating the Universe's First 2 Billion Years The simulation models a volume of space more than 100 times larger than those covered by earlier comparable projects. Its virtual universe spans a cube approximately 1.5 billion light-years on each side, providing a view of…
Image: NASA, ESA, CSA, Lukas Furtak (Ben-Gurion University); Image Processing: Alyssa Pagan (STScI) Which comes first, the galaxy or the black hole? We don't know, but scientists have long thought it could be the galaxy: Large stars within an existing…
The first direct mass measurement from the early universe weighs in on the debate over the origins of supermassive black holes. Which comes first, the galaxy or the black hole? For decades, the standard response has been that we don't…
The James Webb Space Telescope (JWST) and Nancy Roman Space Telescope are revealing the universe's earliest chapters in extraordinary detail. To help astronomers understand what they are seeing, researchers at the Center for Astrophysics | Harvard & Smithsonian have developed "Lumina," one…
Two black holes can collide and merge into one. But could the opposite happen: could a single black hole split into two smaller ones? That question is explored in a new theoretical study: "When Black Holes Admit Pair-of-pants Topologies", published…
Why do the gas shell and planet-forming discs in the Orion Nebula appear much younger than the stars themselves? Astronomers from Leiden University and international colleagues have proposed a new explanation: the most massive star at the heart of the…
Some supermassive black holes rapidly consume surrounding matter while simultaneously firing powerful streams of plasma into space at nearly the speed of light. However, this creates a physical puzzle: rapid feeding is expected to form a cold, flat accretion disk…
Black holes, dark matter, gravitational waves, and the big‑picture universe.
An article joins this feed when it matches these terms. Each one is also a search of its own.