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Keyword: stringtheory

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  • Gravity Without Mass? New Study Challenges the Existence of Hypothetical Dark Matter

    06/10/2024 9:00:46 AM PDT · by Red Badger · 63 replies
    The Debrief ^ | June 07, 2024 | Micah Hanks
    A recent study that presents new challenges to the existence of dark matter suggests gravity may be able to exist even in the absence of mass. Although all life on Earth experiences its effects daily, gravity remains one of the great mysteries of modern physics. Now, a new study published by Dr. Richard Lieu with The University of Alabama in Huntsville (UAH) proposes that the gravitational effects observed in galaxies and clusters may be the result of what he likens to topological defects in the universe, a theory that does not require the inclusion of dark matter to explain phenomena...
  • A strange intermittent radio signal from space has astronomers puzzled

    06/06/2024 11:46:47 AM PDT · by Red Badger · 37 replies
    The Conversation ^ | June 05, 2024 | Staff
    When astronomers turn our radio telescopes out towards space, we sometimes detect sporadic bursts of radio waves originating from across the vast expanse of the universe. We call them “radio transients”: some erupt only once, never to be seen again, and others flicker on and off in predictable patterns. We think most radio transients come from rotating neutron stars known as pulsars, which emit regular flashes of radio waves, like cosmic lighthouses. Typically, these neutron stars spin at incredible speeds, taking mere seconds or even a fraction of a second to complete each rotation. Recently, we discovered a radio transient...
  • Thomas Edison invented the concept of the job interview. Albert Einstein himself failed Edison's Test

    06/06/2024 8:51:08 AM PDT · by SeekAndFind · 66 replies
    History Facts ^ | 06/06/2024
    Although Thomas Edison was awarded 2,332 worldwide patents as an inventor, one of his lasting contributions to modern society was not proprietary: the job interview. Edison was not just a prolific inventor — he was also a businessman in charge of an industrial empire. His corporation, Thomas A. Edison, Inc., employed more than 10,000 workers at dozens of companies. Edison wanted employees who could memorize large quantities of information and also make efficient business decisions. To find them, he devised an extensive questionnaire to assess job candidates’ knowledge and personality.Edison began using tests for candidate assessment in the late 19th...
  • Elon Musk's xAI selects southern city for 'world's largest' supercomputer site

    06/07/2024 8:06:33 AM PDT · by SeekAndFind · 51 replies
    MSN Via Fox News ^ | 06/06/2024 | Aislinn Murphy
    XAI has its sights set on creating the world’s largest supercomputer and, according to a recent announcement, the Elon Musk-founded artificial intelligence company has selected Memphis for its site. The Greater Memphis Chamber revealed the southwestern Tennessee city had landed the planned project on Wednesday, saying it will be the "largest capital investment by a new-to-market company in Memphis history." The supercomputer will be called the "Gigafactory of Compute," the group said. Musk said it's "true" in a reply to an X post that contained footage of the Greater Memphis Chamber’s press conference announcing plans for Memphis to get the...
  • Costco to stop selling books in surprise blow to publishers: report

    06/07/2024 8:10:56 AM PDT · by SeekAndFind · 62 replies
    New York Post ^ | 06/06/2024 | Ariel Zilber
    Costco will no longer offer books for sale year-round and will instead stock them only for the holiday shopping period and during special promotions, according to a report — a surprise move that poses yet another threat to the publishing industry.Several publishing executives who were informed of the retailer’s plans told The New York Times that Costco will cease offering books for sale on a consistent basis starting in January.The decision was met with criticism on Reddit, where users vented that the decision was akin to “cancelling the hot dog in the food court” — a reference to Costco’s beloved...
  • Astronomers find long-missing dwarf galaxies — too many of them...Apparent overabundance means theories of how galaxies took shape in the early universe may need adjusting

    05/22/2024 12:04:05 PM PDT · by Red Badger · 13 replies
    Science.ORG ^ | May 22, 2024 | JONATHAN O’CALLAGHAN
    Two dwarf galaxies (top and bottom) orbit the much larger Andromeda galaxy. DAVID DAYAG/WIKIMEDIA COMMONS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ When astronomers fret about the “missing satellites problem,” they’re not talking about spacecraft in Earth orbit. Their problem is much bigger: For decades, far fewer dwarf galaxies have been seen orbiting the Milky Way and other large galaxies than predicted by models of galaxy formation. But now, two groups of astronomers have found evidence for not just a sufficient number of satellite galaxies to satisfy the simulations—but too many. “Maybe we’ve oversolved the problem,” says Marcel Pawlowski, an astronomer at the Leibniz Institute for...
  • Hidden in the Halo: MIT Researchers Discover the Universe’s Oldest Stars

    05/16/2024 9:53:05 AM PDT · by Red Badger · 24 replies
    MIT astronomers discovered three of the oldest stars in the universe, and they live in our own galactic neighborhood. The stars are in the Milky Way’s “halo” — the cloud of stars that envelopes the main galactic disk — and they appear to have formed between 12 and 13 billion years ago, when the very first galaxies were taking shape. Credit: Serge Brunier; NASA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Astronomers discovered three ancient stars circling the Milky Way’s halo, formed 12-13 billion years ago. MIT researchers have discovered three of the oldest stars in the universe, and they happen to live in our own...
  • European Space Agency refuses to name Israeli in sensational discovery

    05/16/2024 6:11:46 AM PDT · by Eleutheria5 · 15 replies
    Ynet ^ | 13/5/24 | Elad Zeret
    Just two weeks ago, the European Space Agency announced the discovery of a new black hole, the heaviest on the Milky Way, 33 times bigger than the Sun and 2,000 light years from Earth. Tel Aviv University’s Prof. Tsevi Mazeh, who was recently awarded the Israel Prize in physics, is among those responsible for the European Gaia spacecraft’s discovery. But if you ask him how excited he was that week, in which he both learned of his Israel prize award and his research on the new black was published, he’ll swiftly answer “The Israel prize wins bigtime.” “I cried a...
  • WARP DRIVE Breakthrough Could Enable Constant-Velocity Subluminal Travel, Physics Team Says

    05/15/2024 8:45:53 AM PDT · by Red Badger · 64 replies
    The Debrief ^ | May 15, 2024 | Micah Hanks
    A novel warp drive concept that can function without any need for hypothesized exotic or negative forms of energy has been unveiled in a groundbreaking new study by leading propulsion researchers. Dubbed the “Constant-Velocity Subluminal Warp Drive,” the concept, developed by physicists with the Advanced Propulsion Laboratory at the New York-based think tank Applied Physics and from the University of Alabama in Huntsville, offers a theoretical new means of propulsion for space travel that conforms to general relativity, allowing it to operate at constant subluminal speeds with no need for unphysical forms of matter outlined in past concepts. According to...
  • James Webb Space Telescope Data Reveals New Insights Into the Brightest GAMMA RAY BURST EVER DETECTED

    05/13/2024 8:00:00 AM PDT · by Red Badger · 8 replies
    The Debrief ^ | May 13, 2024 | Micah Hanks
    X-ray image of GRB221009A (Credit: NASA/Swift) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Observations by the James Webb Space Telescope are offering new clues about the nature of a massive supernova associated with GRB 221009A, the brightest gamma-ray burst astronomers have ever recorded. The new research confirms the presence of a supernova linked to this highly energetic source of gamma rays and reveals its comparatively low production of radioactive nickel, findings that challenge our currently accepted models involving these powerful events. Astronomers hope the new findings made possible by NASA’s premier space science observatory will also help to offer unique new views into the processes that...
  • 'It would be within its natural right to harm us to protect itself': How humans could be mistreating AI right now without even knowing it

    05/13/2024 7:45:21 PM PDT · by SunkenCiv · 54 replies
    Live Science ^ | May 4, 2024 | Keumars Afifi-Sabet
    Artificial intelligence (AI) is becoming increasingly ubiquitous and is improving at an unprecedented pace...But there are risks in embracing any new technology, especially one that we do not fully understand. While AI could be a powerful personal assistant, for example, it could also represent a threat to our livelihoods and even our lives.The various existential risks that an advanced AI poses means the technology should be guided by ethical frameworks and humanity's best interests, says researcher and Institute of Electrical and Electronics Engineers (IEEE) member Nell Watson.In "Taming the Machine" (Kogan Page, 2024), Watson explores how humanity can wield the...
  • New Fusion Milestone With Tungsten 'West' Tokamak Sustains Super-Hot Plasma for Record-breaking Six Minutes

    05/06/2024 9:16:12 AM PDT · by Red Badger · 39 replies
    The Debrief ^ | May 6, 2024 | Micah Hanks
    WEST (Credit: CEA-IRFM). A new record in fusion has been achieved using a device internally clad in tungsten, a development that could set the pace for helping make fusion energy viable at the commercial scale. Princeton Plasma Physics Laboratory (PPPL), a U.S. Department of Energy (DOE) facility, reports that the device was able to sustain hot fusion plasma nearing temperatures of 50 million degrees Celsius for a record-breaking six minutes. Relying on 1.15 gigajoules of power, the latest achievement saw a 15% increase in energy, as well as twice the density of previous experiments. The new milestone was set using...
  • Stanford Scientists Have Produced the First Complete Picture of an Elusive Quasiparticle

    04/30/2024 11:13:07 AM PDT · by Red Badger · 20 replies
    Scientists have taken a significant step in understanding these whirling quasiparticles and putting them to work in future semiconductor technologies. Researchers reported that they have imaged the exciton’s electron and hole for the first time, revealing how excitons may be trapped in dense, stable arrays. According to the scientists, the findings have significant implications for the development of various future technologies as well as the quest to better understand excitons. The findings were published on March 8th, 2022, in the journal Nature by researchers from the Department of Energy’s SLAC National Accelerator Laboratory, Stanford University, and the Okinawa Institute for...
  • Only a Matter of 'Time': On Einstein, Negative Mass, Time Travel and Aliens

    04/30/2024 9:11:39 AM PDT · by Red Badger · 31 replies
    The Debrief ^ | April 29, 2024 | AVI LOEB
    In 1957, the astrophysicist Herman Bondi wrote a paper in which he considered the possible existence of a negative mass in Albert Einstein’s theory of gravity. A negative mass would repel a positive mass away from it. Given that, a pair of positive and negative masses could accelerate together up to the speed of light. The negative mass would push away the positive mass which in turn would pull the negative mass for the ride. The runaway pair would accelerate indefinitely, without any need for fuel or a propulsion system. Energy conservation would not be violated because the sum of...
  • An Engineer Says He’s Found a Way to Overcome Earth’s Gravity

    04/29/2024 9:25:53 AM PDT · by kawhill · 90 replies
    Popular Mechanics ^ | 2024 | Darren Orf
    Discovering a machine that could somehow produce thrust without releasing propellant would be a game-changer for human space travel. There’s just one problem—such a device would defy the laws of physics.
  • Record-Breaking Stellar Black Hole Found Lurking Close to Earth

    04/17/2024 12:58:44 PM PDT · by Red Badger · 23 replies
    Science Alert ^ | 17 April 2024 | MICHELLE STARR
    You never really know what you might find hiding in your own backyard, especially if those things are particularly adept at escaping detection. Just 1,924 light-years from the Solar System, in the constellation of Aquila, astronomers have just discovered a black hole. And it's not just any black hole. Named Gaia BH3, or BH3, the object is the most massive stellar-mass black hole we've ever spotted in the Milky Way, clocking in at a hefty 33 times the mass of the Sun. It's the second-closest black hole we've found to our home-world, and it's just hanging out, quietly in space,...
  • Department of Energy Fusion Discovery Could Allow Physicists to Tame Volatile Plasmas

    04/17/2024 7:22:44 AM PDT · by Red Badger · 16 replies
    The Debrief ^ | APRIL 16, 2024 | MICAH HANKS
    (Princeton Plasma Physics Laboratory) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Researchers at the U.S. Department of Energy’s Princeton Plasma Physics Laboratory (PPPL) have developed a new strategy in the quest to harness fusion to produce electricity: combining two existing methods of managing plasma to allow greater overall flexibility. The PPPL team’s new dual approach brings together electron cyclotron current drive (ECCD) methods with resonant magnetic perturbations (RMP), marking the first time a simulation showing how they can be used together could facilitate greater control of plasma during fusion reactions. In simple terms, fusion produces energy by replicating the natural processes occurring on the surface of...
  • First-Ever 2D Single-Atom Layer of GOLD Created Using 100-Year-Old Japanese Etching Technique

    04/16/2024 1:14:34 PM PDT · by Red Badger · 5 replies
    The Debrief ^ | APRIL 16, 2024 | CHRISTOPHER PLAIN
    Research scientists from Linköping University (LiU) in Sweden say they have created the first two-dimensional single-atom layer of gold using a technique perfected by Japanese smiths over 100 years ago. Dubbed “goldene” in reference to the popular single-atom carbon material graphene that essentially kicked off the 2D materials revolution, the breakthrough material could possess a large number of exotic properties like those found in other single-atom 2D materials. The researchers behind the first-ever accomplishment also say they believe goldene could also offer several immediate applications. These include new methods for harvesting energy, catalysis for hydrogen generation, carbon conversion, water purification,...
  • 'Warp Factory' Simulator From Physics Think Tank to Aid Creation of Star Trek-Style Warp Drives

    04/15/2024 7:58:38 AM PDT · by Red Badger · 58 replies
    The Debrief ^ | April 15, 2024 | CHRISTOPHER PLAIN
    International Thinktank Applied Physics (AP) has released its “Warp Factory” simulator and toolkit to help scientists and engineers move closer to building a real-world Star Trek-style warp drive. Having already established itself in the nascent field of warp mechanics with the previous release of its “physical warp drive” design in 2021, AP is now offering its expertise to the broader community to advance the development of existing and future warp drive concepts. The Public Benefit Corporation is also putting its money where its mouth is by offering warp field theorists a chance at $500,000 worth of grant money, a commitment...
  • Scientists Create Levitating Graphite Plate For Ultra-Sensitive Quantum Sensors

    04/11/2024 6:14:25 AM PDT · by Red Badger · 11 replies
    Science Alert ^ | April 11, 2024 | DAVID NIELD
    (Okinawa Institute of Science and Technology) Levitation is the kind of superpower many researchers would love to get their hands on. While there are a number of ways to fight the forces of gravity, few are suitable for the kinds of ultrasensitive devices that would benefit from floating untethered in a vacuum. Led by a team from the Okinawa Institute of Science and Technology (OIST) in Japan, a team of researchers have found a way to shield thin wafers of graphite as they hover freely above a grid of magnets, making them far less susceptible to currents that interfere with...