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Keyword: spacetime

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  • Mystery Solved: Black Holes Twist Space-Time Like Taffy

    08/01/2016 9:20:39 AM PDT · by BenLurkin · 12 replies
    space.com ^ | July 30, 2016 07:48am ET
    The story starts in the 1980s, when astronomers found that small (stellar-mass) black holes emit X-ray light that flickers in a curious pattern. At first, this flickering occurs every few seconds; however, the time between each flicker shortens over the course of a few months, eventually stopping completely. This "quasi-periodic oscillation" (QPO) was thought to be a result of a phenomenon predicted by Albert Einstein's theory of general relativity — that any object with enough mass, like a black hole, will twist space-time as it spins. Later, scientists calculated that these gravitational vortices will cause the orbits of particles around...
  • 100 years later scientists prove Einstein's theory

    02/11/2016 10:27:40 AM PST · by Olog-hai · 21 replies
    INN ^ | 2/11/2016, 7:22 PM | (Arutz Sheva Staff)
    It took a century, but the theory from Albert Einstein handwritten neatly on paper that is now yellowing has finally been vindicated. Israeli officials on Thursday offered a rare look at the documents where Einstein presented his ideas on gravitational waves, a display that coincided with the historic announcement that scientists had glimpsed the first direct evidence of his theory. [...] In a landmark discovery for physics and astronomy, international scientists announced in Washington on Thursday that they had glimpsed the first direct evidence of gravitational waves, or ripples in space-time. Einstein's theory states that mass warps space and time,...
  • The Most Mind-Bending Fact I Learned in Physics

    11/19/2015 10:56:52 PM PST · by LibWhacker · 64 replies
    Real Clear Science ^ | 11/2015 | Tom Hartsfield
    Physics is built out of philosophically fascinating ideas. Or, at least, ideas that fascinate us as physicists. We are often moved to reverentially proclaim the beauty of various concepts and theories. Sometimes this beauty makes sense to other people (we're made of star stuff) and other times it's opaque (Frobenius manifolds in psuedo-Euclidean spaces). I have my own personal favorite idea. It arises from the philosophically fantastic (but mathematically moderate) workings of Einstein's relativity theory. The theory of special relativity holds that time and space are not separate entities, each operating on its own; rather they are intimately and inextricably...
  • Gravitational Wavelengths Could Crack the Black Hole Code

    10/20/2013 7:35:47 AM PDT · by BenLurkin · 12 replies
    guardianlv.com ^ | October 20, 2013. | Jessica Rosslee on
    Okay, but what exactly is a gravitational wave and how could they help us crack the conundrum of the black hole code? A gravitational wave is akin to a ripple in space-time. Albert Einstein predicted that massive bodies changing speed or direction generate these gravitational waves. Picture bodies like a pair of black holes orbiting each other. This then creates a gravitational wave that ripples outwards, like a disturbance in a still pool of water after a leaf has dropped onto its surface and ripples are sent across the surface. Like star-crossed lovers, the black holes of two merging galaxies...
  • Black Holes Feed On Quantum Foam, Says Cosmologist

    09/12/2013 6:29:02 PM PDT · by LibWhacker · 43 replies
    Nobody knows how the universe’s biggest black holes grow so large. Now one astrophysicist says it’s because they feed on the quantum foam that makes up the fabric of spacetime One of the more fascinating astrophysical discoveries in recent years is that almost all galaxies hide supermassive black holes at their cores. Indeed, astronomers believe that galaxies and black holes have a kind of symbiotic relationship so that one cannot form or grow without the other. The evidence comes from observations of galaxies both near and far—almost all contain huge black holes. But that raises an interesting question. We see...
  • Physicists Recreate 'End Of Time" In Lab

    07/26/2011 6:12:32 AM PDT · by LibWhacker · 27 replies
    Ever wondered what would happen if the dimension of time came to a sudden end? A new experiment reveals all One of the most exciting areas of science is the emerging field of spacetime analogues. This is the discipline in which physicists play around with systems that have a formal mathematical link with general relativity. For example, changes in the way electrons move in graphene as it is cooled are identical to the changes that may have occurred in the universe soon after the big bang. So physicists can use cool graph to test theories about the universe's earliest behaviour....
  • Splitting Time from Space—New Quantum Theory Topples [sic] Einstein's Spacetime

    11/25/2009 12:25:53 AM PST · by Daffynition · 69 replies · 15,041+ views
    ScientificAmerican ^ | Dec 2009 | Zeeya Merali
    Was Newton right and Einstein wrong? It seems that unzipping the fabric of spacetime and harking back to 19th-century notions of time could lead to a theory of quantum gravity. Physicists have struggled to marry quantum mechanics with gravity for decades. In contrast, the other forces of nature have obediently fallen into line. For instance, the electromagnetic force can be described quantum-mechanically by the motion of photons. Try and work out the gravitational force between two objects in terms of a quantum graviton, however, and you quickly run into trouble—the answer to every calculation is infinity. But now Petr Hořava,...
  • God’s Mighty Expanse (ever wonder what the BIBLE says about COSMOLOGY?)

    02/25/2009 6:52:31 PM PST · by GodGunsGuts · 66 replies · 1,679+ views
    CMI ^ | 26 February 2009 | D. Russell Humphreys, Ph.D.
    God’s mighty expanse by D. Russell HumphreysPublished: 26 February 2009(GMT+10) Psalm 150:1, the first verse of the last psalm, contains a phrase that has always intrigued me: … Praise Him in his mighty expanse. (NAS), or… praise him in the firmament of his power. (KJV) God made the expanse (firmament) on the second day and called it “heavens” (Genesis 1:8, plural from literal Hebrew). Later, on the fourth day, He populated the expanse with the sun, moon and stars (Genesis 1:14-19). So the expanse is not the heavenly bodies, but rather the space that contains the heavenly bodies. Normally people...
  • The Multiverse: Big Bangs Without End

    09/23/2008 3:14:32 PM PDT · by LibWhacker · 43 replies · 484+ views
    Sky and Telescope ^ | 9/18/08 | Dan Falk
    Three different trends in physics each suggest that our universe is just one of many.We usually think of the universe as being “everything there is.” But many astronomers and physicists now suspect that the universe we observe is just a small part of an unbelievably larger and richer cosmic structure, often called the “multiverse.” This mind-bending notion – that our universe may be just one of many, perhaps an infinite number, of real, physical universes – was front and center at a three-day conference entitled "A Debate in Cosmology — The Multiverse," held at the Perimeter Institute for Theoretical Physics...
  • The Many Directions of Time (book)

    04/05/2007 2:27:39 PM PDT · by TemplarAkolyte · 9 replies · 470+ views
    afmayer.net ^ | April 4, 2007 | Alex Mayer
    Author - Alexander Mayer: This book is going to change the course of the 21st Century. Many old ideas (and inflated reputations) will die. Inevitably, some people will resist that. Science is about ideas that work. The only thing that matters in science is accurate predictions of empirical phenomena. Just read the book. Partial Abstract: The concept of geometric cosmic time is introduced, which allows astrophysical observations to be interpreted without concluding that an unknown force is accelerating the expansion of the Universe. This relativistic temporal model yields a redshift-distance relationship based on simple geometric rules that involves no free...
  • Time Before Time [speculative cosmology]

    08/30/2006 1:01:48 AM PDT · by snarks_when_bored · 130 replies · 3,590+ views
    Seed Magazine ^ | August 28, 2006 | Sean Carroll
    TIME BEFORE TIME An event like the Big Bang is about as likely as billions of coin tosses all coming up heads. Explaining why that is might take us from empty space to other universes--and through the mirror of time. by Sean Carroll • Posted August 28, 2006 11:53 AM From the SEPTEMBER issue of Seed:    The nature of time is such that the influence of the very beginning of the universe stretches all the way into your kitchen—you can make an omelet out of an egg, but you can't make an egg out of an omelet. Time, unlike...
  • Black Hole Puts Dent In Space-time

    01/24/2006 10:53:26 PM PST · by NormsRevenge · 13 replies · 443+ views
    Space.com on Yahoo ^ | 1/24/06 | Ker Than
    A spinning black hole in the constellation Scorpius has created a stable dent in the fabric of spacetime, scientists say. The dent is the sort of thing predicted by Albert Einstein's theory of general relativity. It affects the movement of matter falling into the black hole. The spacetime-dent is invisible, but scientists deduced its existence after detecting two X-ray frequencies from the black hole that were identical to emissions noted nine years ago. The finding will allow scientists to calculate the black hole's spin, a crucial measurement necessary for describing the object's behavior. Blinking X-rays Black holes form when very...
  • Leaking Gravity May Explain Cosmic Puzzle

    02/28/2005 6:29:00 PM PST · by AntiGuv · 69 replies · 3,163+ views
    SPACE.com ^ | February 28, 2005 | Sara Goudarzi
    WASHINGTON, D.C. - Scientists may not have to go over to the dark side to explain the fate of the universe.The theory that the accelerated expansion of the universe is caused by mysterious "dark energy" is being challenged by New York University physicist Georgi Dvali. He thinks there's just a gravity leak.Scientists have known since the 1920s that the universe is expanding. In the late 1990s, they realized that it is expanding at an ever-increasing pace. At a loss to explain the stunning discovery, cosmologists blamed it on dark energy, a newly coined term to describe the mysterious antigravity force...
  • On Plato, the Early Church, and Modern Science: An Eclectic Meditation

    11/30/2004 6:21:11 PM PST · by betty boop · 934 replies · 11,089+ views
    November 30, 2004 | Jean F. Drew
    On Plato, the Early Church, and Modern Science: An Eclectic Meditation By Jean F. Drew God, purposing to make the universe most nearly like the every way perfect and fairest of intelligible beings, created one visible living being, containing within itself all living beings of the same natural order. Thus does Plato (d. 347 B.C.) succinctly describe how all that exists is ultimately a single, living organism. At Timaeus20, he goes on to say: “There exists: first, the unchanging form, uncreated and indestructible, admitting no modification and entering no combination … second, that which bears the same name as the...
  • Time Trip - questions and answers (How widely accepted is the theory that we can travel in time?)

    12/25/2003 8:12:15 PM PST · by Momaw Nadon · 91 replies · 2,512+ views
    BBC ^ | Friday, December 26, 2003 | BBC
    The Future According to Professor Paul Davies "Scientists have no doubt whatever that it is possible to build a time machine to visit the future". Since the publication of Einstein’s Special Theory of Relativity in 1905, few, if any, scientists would dispute that time travel to the future is perfectly possible. According to this theory, time runs slower for a moving person than for someone who is stationary. This has been proven by experiments using very accurate atomic clocks. In theory, a traveller on a super high-speed rocket ship could fly far out into the Universe and then come back...