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Keyword: darkforce

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  • Hubble Discovery Hints at a Serious Problem With Our Understanding of Dark Matter

    09/11/2020 10:56:00 AM PDT · by Red Badger · 61 replies
    www.sciencealert.com ^ | 11 SEPTEMBER 2020 | MICHELLE STARR
    It would be extremely optimistic to suggest that we have a good handle on dark matter. But even the slight grasp we do have may be missing something important. New observations from the Hubble Space Telescope have found much higher concentrations of dark matter than expected in some galaxies, by over an order of magnitude. These concentrations are inconsistent with theoretical models, suggesting that there's a big gap in our understanding - the simulations could be incorrect, or there could be a property of dark matter we don't fully understand, according to the research team. "We have done a lot...
  • Astronomy Picture of the Day - GW190521: Unexpected Black Holes Collide

    09/08/2020 3:51:23 PM PDT · by MtnClimber · 17 replies
    APOD.NASA.gov ^ | 9 Sep, 2020 | Illustration Credit: Raúl Rubio (Virgo Valencia Group, The Virgo Collaboration)
    Explanation: How do black holes like this form? The two black holes that spiraled together to produce the gravitational wave event GW190521 were not only the most massive black holes ever seen by LIGO and VIRGO so far, their masses -- 66 and 85 solar masses -- were unprecedented and unexpected. Lower mass black holes, below about 65 solar masses are known to form in supernova explosions. Conversely, higher mass black holes, above about 135 solar masses, are thought to be created by very massive stars imploding after they use up their weight-bearing nuclear-fusion-producing elements. How such intermediate mass black...
  • Black hole 'hair' could be detected using ripples in space-time

    08/29/2020 4:59:58 PM PDT · by BenLurkin · 19 replies
    LiveScience ^ | 28 August 2020 | Paul Sutter
    The information locked inside black holes could be detected by feeling their 'hair,' new research suggests. As far as we understand them (which, admittedly, is not very much), black holes are suspiciously simple objects. Regardless of what falls in... black holes can be described by three and only three simple numbers: charge, mass and spin. The reason this is suspicious is that something had to happen to all that juicy information that fell into those two black holes. The simplest solution is the theorem, first coined by the American physicist John Wheeler, that "black holes have no hair" — they...
  • Lack of evidence put Hawking’s Nobel hopes in black hole

    03/15/2018 5:21:09 AM PDT · by C19fan · 41 replies
    AP ^ | March 14, 2018 | Seth Borenstein
    Stephen Hawking won accolades from his peers for having one of the most brilliant minds in science, but he never got a Nobel Prize because no one has yet proven his ideas. The Nobel committee looks for proof, not big ideas. Hawking was a deep thinker — a theorist — and his musings about black holes and cosmology have yet to get the lockdown evidence that accompanies the physics prizes, his fellow scientists said.
  • Mystery gas discovered near center of Milky Way

    08/19/2020 9:55:02 PM PDT · by BenLurkin · 39 replies
    Phys.org ^ | 08/19/2020 | Australian National University
    An international team of researchers have discovered a dense, cold gas that's been shot out from the center of the Milky Way "like bullets". Exactly how the gas has been ejected is still a mystery, but the research team, including Professor Naomi McClure-Griffiths from The Australian National University (ANU), say their findings could have important implications for the future of our galaxy. The study also raises new questions about what's happening in our galactic center right now. The center of the Milky Way is home to a massive black hole, but it's unclear whether this black hole has expelled the...
  • Is 'Planet Nine' actually a grapefruit-sized black hole? Big new telescope could find out

    07/12/2020 9:46:33 AM PDT · by BenLurkin · 37 replies
    space,com ^ | 07/11/2020
    Over the past few years, researchers have noticed an odd clustering in the orbits of multiple trans-Neptunian objects (TNOs), which dwell in the dark depths of the far outer solar system. Some scientists have hypothesized that the TNOs' paths have been sculpted by the gravitational pull of a big object way out there, something five to 10 times more massive than Earth (though others think the TNOs may just be tugging on each other). This big "perturber," if it exists, may be a planet — the so-called "Planet Nine," or "Planet X" or "Planet Next" for those who will always...
  • A supermassive black hole lit up a collision of two smaller black holes

    07/10/2020 11:54:37 AM PDT · by Red Badger · 17 replies
    www.technologyreview.com ^ | Jun 26, 2020 | Neel V. Patel
    Artist's conception. Image: Caltech/R. Hurt (IPAC) Astronomers from Caltech have reported that they’ve observed a collision between two black holes. Normally such an event is invisible, but this time a more massive black hole sitting nearby helped illuminate the other two as they collided. If confirmed, the findings, published in Physical Review Letters, would be the first optical observations ever made of a black hole merger. What happened: First detected in May 2019 and dubbed S190521g, the merger happened about 4 billion light-years away, within the vicinity of a supermassive black hole called J1249+3449. This object is 100 million times...
  • Dark Understanding of Matter

    03/25/2008 4:53:00 AM PDT · by Renfield · 4 replies · 189+ views
    Thunderbolts.info ^ | 3-25-08 | Stephen Smith
    Images from the Hubble Space Telescope have revealed a so-called "ring of dark matter" circling a galaxy cluster. Does dark matter exist? Or is electricity a better explanation for the structure of the universe? {Galaxy Cluster CL0024+17 with an overlay showing a supposed dark matter ring. Credit: NASA, ESA, M. J. Jee and H. Ford et al. (Johns Hopkins University)} In a recent announcement, NASA and the European Space Agency (ESA) reported the discovery of something in deep space that seems to confirm previously inferred observations of "dark matter." Although "dark matter" cannot be seen or detected by instruments, its...
  • A massive star in a far-off galaxy just disappeared, leaving behind no trace

    07/02/2020 11:11:46 AM PDT · by BenLurkin · 92 replies
    wion ^ | Jul 01, 2020
    A giant star which was under the observation of astronomers for over ten years has suddenly vanished. The star in question was located in a dwarf galaxy 75 million light-years away, and was one of the largest stars in the known universe. The star, which was 2.5 times brighter than the Sun, left no trace behind The star was located in a very far off galaxy, making its detection and observation very difficult. The astronomers observed it based on its signature, which was picked up and then analysed, instead of a direct observation. A highly unstable blue star, researchers picked...
  • Every black hole may hold a hidden universe

    07/29/2010 5:26:22 AM PDT · by decimon · 101 replies · 8+ views
    New Scientist ^ | July 23, 2010 | Anil Ananthaswamy
    WE COULD be living inside a black hole. This head-spinning idea is one cosmologist's conclusion based on a modification of Einstein's equations of general relativity that changes our picture of what happens at the core of a black hole. In an analysis of the motion of particles entering a black hole, published in March, Nikodem Poplawski of Indiana University in Bloomington showed that inside each black hole there could exist another universe (Physics Letters B, DOI: 10.1016/j.physletb.2010.03.029). "Maybe the huge black holes at the centre of the Milky Way and other galaxies are bridges to different universes," Poplawski says. If...
  • Collision between black hole and 'mysterious object' puzzles astronomers

    06/23/2020 7:04:52 PM PDT · by BenLurkin · 43 replies
    CNET ^ | June 23, 2020 | Jackson Ryan
    On Aug. 14, 2019, a gravitational wave -- a massive ripple through the fabric of space-time -- washed over the Earth. The signal was one of the strongest ever seen by the gravitational wave scientists at the Laser Interferometer Gravitational-wave Observatory and Italy's Virgo observatory. After an alert was sent out moments after detection, teams of astronomers across the world turned their telescopes to the point in space that the wave emanated from. But their searches came up empty. No light, no X-rays, no infrared, no gamma rays. On Tuesday, researchers from the LIGO and Virgo collaborations detail their full...
  • Dark matter hunt yields unexplained signal

    06/18/2020 8:33:31 AM PDT · by BenLurkin · 21 replies
    BBC ^ | 06/17/2020 | Paul Rincon
    Scientists working on the Xenon1T experiment have detected more activity within their detector than they would otherwise expect. There are three potential explanations for the new signal from the Xenon1T experiment. Two require new physics to explain, while one of them is consistent with a hypothesised dark matter particle called a solar axion. There are several theories to account for what that particle might be like. The most favoured one has been the WIMP, or Weakly Interacting Massive Particle. Physicists working on the Xenon series of experiments have spent more than a decade hunting for signs of these WIMPs. ......
  • A Black Hole Relic from the Big Bang –“May Exist in Our Solar System”

    05/06/2020 12:03:15 PM PDT · by LibWhacker · 31 replies
    A Black Hole Relic from the Big Bang –“May Exist in Our Solar System” Posted on May 4, 2020 in Science  A bowling-ball sized primordial black hole, a relic of the Big Bang, may exist in our Solar system that could be detected according to theoretical physicist Edward Witten, at the Institute for Advanced Study, who has been compared to Issac Newton and Einstein.In a paper posted September, 2019 to arXiv, physicists James Unwin, University of Illinois at Chicago and Jakub Scholtz at the University of Durham in the United Kingdom, showed that the likelihood of our Sun capturing a...
  • A Black Hole Is ‘Almost on Our Doorstep’

    05/06/2020 9:14:35 AM PDT · by plain talk · 48 replies
    The Atlantic ^ | May 6, 2020 | Marina Koren
    In the night sky, far south of the equator, there’s a curious collection of faint constellations embedded in the tapestry of stars. They do not bear the names of myths and legends, because the ancient Greeks couldn’t see them from the Northern Hemisphere. These constellations were charted later, in the mid-18th century, by a French astronomer who sailed south ... And just like a cluttered attic, this corner of sky has been hiding something truly remarkable. Astronomers have discovered a black hole in one of the constellations, the suitably named Telescopium. At just 1,000 light-years away, the black hole is...
  • How much space does a black hole take up?

    04/28/2020 9:25:53 PM PDT · by MtnClimber · 71 replies
    Astronomy ^ | 27 Apr, 2020 | Caitlyn Buongiorno
    Black holes are most often discussed in terms of their mass, but how much volume do these hefty, invisible objects actually have? Lurking at the center of the Milky Way is a gargantuan black hole that tips the scales at several million times the mass of the Sun. Like all black holes, this supermassive monster — called Sagittarius A* — devours anything that falls too close, including light. However, consuming material is just one way these monsters grow to truly astronomical sizes, reaching mindboggling weights. Although astronomers often talk about black holes as being gigantic objects, it’s important to remember...
  • The universe may have been filled with supermassive black holes at the dawn of time

    03/16/2020 12:09:22 PM PDT · by BenLurkin · 28 replies
    space.com ^ | 03/15/2020 | Rafi Leztzer
    Nine hundred million years after the Big Bang, in the epoch of our universe's earliest galaxies, there was already a black hole 1 billion times the size of our sun. That black hole sucked in huge quantities of ionized gas, forming a galactic engine — known as a blazar — that blasted a superhot jet of bright matter into space. On Earth, we can still detect the light from that explosion more than 12 billion years later. Astronomers had previously discovered evidence of primeval supermassive black holes in slightly younger "radio-loud active galactic nuclei," or RL AGNs. RL AGNs are...
  • Space-time is swirling around a dead star, proving Einstein right again

    01/31/2020 7:21:44 AM PST · by C19fan · 32 replies
    Space.com ^ | January 30, 2020 | Charles Q. Choi
    The way the fabric of space and time swirls in a cosmic whirlpool around a dead star has confirmed yet another prediction from Einstein's theory of general relativity, a new study finds. That prediction is a phenomenon known as frame dragging, or the Lense-Thirring effect. It states that space-time will churn around a massive, rotating body. For example, imagine Earth were submerged in honey. As the planet rotated, the honey around it would swirl — and the same holds true with space-time. Satellite experiments have detected frame dragging in the gravitational field of rotating Earth, but the effect is extraordinarily...
  • Mysterious particles spewing from Antarctica defy physics

    01/24/2020 5:46:17 AM PST · by BenLurkin · 71 replies
    Live Science ^ | 01/24/2020 | Rafi Letzter
    The death of this reigning physics paradigm, the Standard Model, has been predicted for decades. There are hints of its problems in the physics we already have. Strange results from laboratory experiments suggest flickers of ghostly new species of neutrinos beyond the three described in the Standard Model. And the universe seems full of dark matter that no particle in the Standard Model can explain. But recent tantalizing evidence might one day tie those vague strands of data together: Three times since 2016, ultra-high-energy particles have blasted up through the ice of Antarctica, setting off detectors in the Antarctic Impulsive...
  • Planet Nine could be a primordial black hole, new research suggests

    09/30/2019 4:33:55 PM PDT · by BenLurkin · 27 replies
    phys.org ^ | 09/30/2019 | Tomasz Nowakowsk
    Primordial black holes (PBHs) are old and relatively small black holes that emerged soon after the Big Bang. They are thought to have been formed as a result of density fluctuations in the very early universe. It is believed that PBHs with the lowest mass have likely evaporated. However, those with larger masses may still exist, evaporating at the present epoch—even though they have been never directly observed. Astronomers Jakub Scholtz of Durham University and James Unwin of University of Illinois at Chicago, assume that PBHs could reside even closer to us than we think. In a recently published paper,...
  • Research team discovers path to razor-sharp black hole images [RINGS!]

    03/23/2020 7:19:03 AM PDT · by Red Badger · 19 replies
    Phys.Org ^ | March 18, 2020 | by Lee Sandberg, Institute for Advanced Study
    The image of a black hole has a bright ring of emission surrounding a "shadow" cast by the black hole. This ring is composed of a stack of increasingly sharp subrings that correspond to the number of orbits that photons took around the black hole before reaching the observer. Credit: George Wong (UIUC) and Michael Johnson (CfA) _________________________________________________________________________________ Last April, the Event Horizon Telescope (EHT) sparked international excitement when it unveiled the first image of a black hole. Today, a team of researchers have published new calculations that predict a striking and intricate substructure within black hole images from extreme...