To the extent that we can see them, galaxies in the very early universe should look relatively young and unformed. But galaxy ALESS 073.1 is a surprise to astronomers: it looks more mature than we’d have any reason to expect. Why? Source: https://earthsky.org/space/galaxy-looks-older-than-its-years-aless-073-1…
Tag: space and time
Random twists of place: How quiet is quantum space-time at the Planck scale?
Fermilab scientists have been conducting experiments to look for quantum fluctuations of space and time at the smallest scale imaginable according to known physics. At this limit, the Planck length, our classical notions of space and time break down. …
The 1st sign of intelligent life beyond Earth?
Physicist Avi Loeb of Harvard believes we should take seriously the idea that ‘Oumuamua – the 1st known object to pass through our solar system from interstellar space – might have been created by an alien civilization. His new book is called “Extraterrestrial.” Source: https://earthsky.org/space/book-avi-loeb-extraterrestrial-1st-sign-of-intelligent-life…
Wormholes may be lurking in the universe—and new studies are proposing ways of finding them
Albert Einstein’s theory of general relativity profoundly changed our thinking about fundamental concepts in physics, such as space and time. But it also left us with some deep mysteries. One was black holes, which were only unequivocally detected over the past few years. Another was “wormholes”—bridges connecting different points in spacetime, in theory providing shortcuts for space travelers. Source: https://phys.org/news/2021-01-wormholes-lurking-universeand-ways.html…
Are Fragments of Energy the Fundamental Building Blocks of the Universe?
hcs_$reboot shares a remarkable new theory from Larry M. Silverberg, an aerospace engineering professor at North Carolina State University (with colleague Jeffrey Eischen). They’re proposing that matter is not made of particles (or even waves), as was long thought, but fragments of energy. [W]hile the theories and math of waves and particles allow scientists to make incredibly accurate predictions about the…
Vera Rubin Observatory should be able to detect a couple of interstellar objects a month.
The Vera C. Rubin Observatory, formerly the Large Synoptic Survey Telescope (LSST), will commence operations sometime next year. Not wanting to let a perfectly good acronym go to waste, its first campaign will be known as the Legacy Survey of Space and Time (LSST). This 10-year survey will study everything from dark matter and dark energy to the formation of the…
AI Has Cracked a Key Mathematical Puzzle For Understanding Our World
An anonymous reader shares a report: Unless you’re a physicist or an engineer, there really isn’t much reason for you to know about partial differential equations. I know. After years of poring over them in undergrad while studying mechanical engineering, I’ve never used them since in the real world. But partial differential equations, or PDEs, are also kind of magical. They’re…
The black hole always chirps twice: Scientists find clues to decipher the shape of black holes
A team of gravitational wave researchers led by the ARC Center of Excellence for Gravitational Wave Discovery (OzGrav) report that when two black holes collide and merge, the remnant black hole “chirps” not once, but multiple times, emitting gravitational waves—intense ripples in the fabric space and time—that reveal information about its shape. Their study has been published in Communications Physics. Source:…
Teenager on TiKTok Resurrects an Essential Question: What is Math?
Long-time Slashdot reader fahrbot-bot shares a story that all started with a high school student’s innocuous question on TikTok, leading academic mathematicians and philosophers to weigh in on “a very ancient and unresolved debate in the philosophy of science,” reports Smithsonian magazine. “What, exactly, is math?” Is it invented, or discovered? And are the things that mathematicians work with — numbers,…
Earth’s magnetic field may change faster than we thought
A long-standing question has been how fast Earth’s magnetic field can change. The authors of a new study say they’ve uncovered some answers. Source: https://earthsky.org/earth/earths-magnetic-field-change-faster-thought…