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Keyword: gammaray

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  • Alien Species Living In The Inner Milky Way Could Be In Danger

    06/26/2012 12:27:17 AM PDT · by Windflier · 58 replies
    Message To Eagle ^ | 23 March 2012 | Staff
    Few people doubt there is intelligent alien life in the Milky Way galaxy, but where can we expect to find it? Astronomers think that the inner sector of the Milky Way Galaxy may be the most likely to support habitable worlds. Unfortunately some of these places are also most dangerous to all life-forms. According to Michael Gowanlock of NASA's Astrobiology Institute, and his Trent University colleagues David Patton and Sabine McConnel, habitability in the Milky Way can be based on three factors: supernova rates, metallicity (the abundance of heavy elements, used as a proxy for planet formation) and the time...
  • Violent Past: Young sun withstood a supernova blast

    10/27/2013 6:03:53 PM PDT · by SunkenCiv · 61 replies
    Science News ^ | May 23, 2007 | Ron Cowen
    Martin Bizzarro of the University of Copenhagen and his colleagues set out to determine the amount of iron in the early solar system. To do so, they measured nickel-60, a decay product of iron-60, in eight meteorites known to have formed at different times during the first 3 million years of the solar system. The meteorites that formed more than about a million years after the start of the solar system contain significantly more nickel-60 than do those that formed earlier, the team found. In a neighborhood of young stars, only a supernova could have produced iron-60, the parent of...
  • Mini Black Holes Might Reveal 5th Dimension

    06/26/2006 8:22:41 PM PDT · by NormsRevenge · 26 replies · 962+ views
    Space.com ^ | 6/25/06 | Ker Than
    A space telescope scheduled for launch in 2007 will be sensitive enough to detect theoretical miniature black holes lurking within our solar system, scientists say. By doing so, it could test an exotic five-dimensional theory of gravity that competes with Albert Einstein's General Theory of Relativity. That is, of course, if the tiny black holes actually exist. The idea, recently detailed online in the journal Physical Review D, is being proposed by Charles Keeton, a physicist at Rutgers University in New Jersey, and Arlie Petters of Duke University in North Carolina. Branes The Randall-Sundrum braneworld model, named after the scientists...
  • Hints of a breakdown of relativity theory?

    08/28/2007 11:24:31 AM PDT · by SunkenCiv · 8 replies · 263+ views
    Scientific American 'blogs ^ | August 22, 2007 | George Musser
    The team studied two gamma-ray flares in mid-2005 from the black hole at the heart of the galaxy Markarian 501. They compared gammas in two energy ranges, from 1.2 to 10 tera-electron-volts (TeV) and from 0.25 to 0.6 TeV. The first group arrived on Earth four minutes later than the second. One team member, physicist John Ellis of CERN, says: "The significance of the time lag is above 95%, and the magnitude of the effect is beyond the sensitivity of previous experiments." Either the high-energy gammas were released later (because of how they were generated) or they propagated more slowly.
  • High Energy Gamma Rays Go Slower Than the Speed of Light?

    10/04/2007 9:33:31 PM PDT · by annie laurie · 12 replies · 1,172+ views
    Universe Today ^ | October 3rd, 2007 | Fraser Cain
    The speed of light is the speed of light, and that's that. Right? Well, maybe not. Try and figure this out. Astronomers studying radiation coming from a distant galaxy found that the high energy gamma rays arrived a few minutes after the lower-energy photons, even though they were emitted at the same time. If true, this result would overturn Einstein's theory of relativity, which says that all photons should move at the speed of light. Uh oh Einstein. The discovery was made using the new MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescope, located on a mountain top on the Canary...
  • Mysterious radiation burst recorded in tree rings

    06/04/2012 10:58:45 AM PDT · by SunkenCiv · 46 replies
    Nature ^ | Sunday, June 3, 2012 | Richard A. Lovett
    Just over 1,200 years ago, the planet was hit by an extremely intense burst of high-energy radiation of unknown cause, scientists studying tree-ring data have found. The radiation burst, which seems to have hit between AD 774 and AD 775, was detected by looking at the amounts of the radioactive isotope carbon-14 in tree rings that formed during the AD 775 growing season in the Northern Hemisphere. The increase in 14C levels is so clear that the scientists, led by Fusa Miyake, a cosmic-ray physicist from Nagoya University in Japan, conclude that the atmospheric level of 14C must have jumped...
  • Researcher points to Sun as likely source of eighth-century 'Charlemagne event'

    12/12/2012 5:34:52 AM PST · by Renfield · 29 replies
    PhysOrg ^ | 11-20-2012
    (Phys.org)—Until recently, the years 774 and 775 were best known for Charlemagne's victory over the Lombards. But earlier this year, a team of scientists in Japan discovered a baffling spike in carbon-14 deposits within the rings of cedar trees that matched those same years. Because cosmic rays are tied to carbon-14 concentrations, scientists around the world have wondered about the cause: a nearby supernova, a gamma ray burst in the Milky Way or an intense superflare emanating from the Sun? Now, Adrian Melott, professor of physics and astronomy at the University of Kansas and Brian Thomas, KU alumnus and professor...
  • Mysterious Energy Bursts May Be Death Knell of Gigantic Stars

    04/17/2013 2:21:13 PM PDT · by LibWhacker · 2 replies
    Space.com ^ | 4/16/13 | Tanya Lewis
    An artist’s impression of the stars creating gamma-ray bursts. The background blue star is the progenitor of a standard long duration gamma-ray burst. A new type of powerful, long-lasting explosion deep in space may be the death knell of gigantic stars, scientists say. Star explosions (called supernovas) can give off high-powered flashes of radiation known as gamma-ray bursts. These bursts usually fall into two categories: ones that last less than two seconds, and ones that last for several minutes. But this new type of explosion can create a gamma-ray burst that goes on for much longer — up to several...
  • Did An 8th Century Gamma Ray Burst Irradiate Earth?

    01/21/2013 7:50:06 AM PST · by blam · 51 replies
    Science Daily ^ | 1-21-2013 | Science Daily
    Did An 8th Century Gamma Ray Burst Irradiate Earth?Science DailyJanuary 21,2013 A nearby short duration gamma-ray burst may be the cause of an intense blast of high-energy radiation that hit the Earth in the 8th century, according to new research led by astronomers Valeri Hambaryan and Ralph NeuhÓ“user. The two scientists, based at the Astrophysics Institute of the University of Jena in Germany, publish their results in the journal Monthly Notices of the Royal Astronomical Society. In 2012 scientist Fusa Miyake announced the detection of high levels of the isotope Carbon-14 and Beryllium-10 in tree rings formed in 775 CE,...
  • Possibly the most distant object known

    07/18/2011 12:34:14 PM PDT · by Red Badger · 23 replies
    http://www.physorg.com ^ | 07-18-2011 | Staff
    The most distant objects in the universe are also the oldest -- or at least that is how they appear to us, because their light has had to travel for billions of years to get here. They are also extraordinarily faint since they are so far away, and only in the last decade have astronomers been able to stretch their vision using the newest telescopes and clever techniques. One such innovation occurred with the launch of the NASA Swift satellite in 2004; it searches for bursts of gamma-ray emission, called GRBs. These flashes, thought to result from the especially spectacular...
  • Crab Nebula's gamma-ray flare mystifies astronomers

    05/11/2011 9:03:57 PM PDT · by NormsRevenge · 26 replies
    BBC News ^ | 5/11/11 | Jason Palmer
    The Crab Nebula has shocked astronomers by emitting an unprecedented blast of gamma rays, the highest-energy light in the Universe. The cause of the 12 April gamma-ray flare, described at the Third Fermi Symposium in Rome, is a total mystery. It seems to have come from a small area of the famous nebula, which is the wreckage from an exploded star. The object has long been considered a steady source of light, but the Fermi telescope hints at greater activity. The gamma-ray emission lasted for some six days, hitting levels 30 times higher than normal and varying at times from...
  • Massive gamma ray bubbles discovered in galaxy center

    11/09/2010 5:57:02 PM PST · by NormsRevenge · 28 replies
    AFP on Yahoo ^ | 11/9/10 | AFP
    WASHINGTON (AFP) – Two huge, unexplained gamma ray emitting bubbles have been discovered at the center of the Milky Way galaxy, US astronomers said Tuesday. Masked by a fog of gamma rays that appears throughout the sky, the bubbles form a feature spanning 50,000 light-years and could be the remnant of a supersized black hole eruption or the outflows from a burst of star formation, the astronomers said. The structure spans more than half of the visible sky, from the constellation Virgo to the constellation Grus, and it may be millions of years old, the astronomers said in a paper...
  • War Crimes against the American People

    10/01/2010 10:31:26 AM PDT · by Surrounded_too · 11 replies
    10-1-10 | Surrounded_too
    The more I think about this, the madder I am. Where is the media on this? Where are the anti-nuke people from NPR who want to make this a nuke-free world? Where are the ethics people of medicine? Where are the Holocost people who despise Nazi experiments? Where are the dental assistants who hide behind the wall when zapping your head as you sit frozen with a lead blanket over your chest and a chunk of film between your teeth? This is new technology that is being perpetrated upon the American people, no different than Nazi Mengele who destroyed children...
  • Space Telescope Sifts Earth Storms for Radiation Flashes

    02/20/2010 3:28:40 PM PST · by NormsRevenge · 8 replies · 394+ views
    Space.com ^ | 2/20/10 | Jeremy Hsu
    A NASA space telescope hunting for the most powerful explosions in the universe is turning its eye on Earth to hunt for tiny flashes of radiation to determine if they pose a rare, but deadly, threat to high-flying commercial airliners. NASA's Fermi Gamma-Ray Space Telescope has joined the search for mysterious gamma-ray flashes above thunderstorms which are ultra-brief, but could be a concern for air travelers, researchers said. Just one millisecond blast of the so-called terrestrial gamma-ray flashes (TGFs) could expose passengers and crew aboard a nearby jet airliner to the same level of radiation as 400 chest X-rays, according...
  • Space Explosion Is Farthest Thing Ever Seen (gamma-ray burst about 13 billion light-years away)

    04/28/2009 8:54:57 AM PDT · by NormsRevenge · 52 replies · 1,608+ views
    A stellar explosion has smashed the record for most distant object in the known universe. The gamma-ray burst came from about 13 billion light-years away, and represents a relic from when the universe was just 630 million years old. "It easily surpassed the most distant galaxies and quasars," said Edo Berger, an astrophysicist at Harvard University and a leading member of the team that first demonstrated the burst's origin. "In fact, it showed that we can use these spectacular events to pinpoint the first generation of stars and galaxies." "The burst most likely arose from the explosion of a massive...
  • Huge gamma-ray blast spotted 12.2 bln light-years from earth

    02/19/2009 10:04:45 PM PST · by rdl6989 · 50 replies · 1,529+ views
    WASHINGTON (AFP) – The US space agency's Fermi telescope has detected a massive explosion in space which scientists say is the biggest gamma-ray burst ever detected, a report published Thursday in Science Express said. The spectacular blast, which occurred in September in the Carina constellation, produced energies ranging from 3,000 to more than five billion times that of visible light, astrophysicists said. "Visible light has an energy range of between two and three electron volts and these were in the millions to billions of electron volts," astrophysicist Frank Reddy of US space agency NASA told AFP. "If you think about...
  • 'Naked eye' gamma-ray burst was aimed almost directly at the Earth

    01/27/2009 11:39:01 PM PST · by Ernest_at_the_Beach · 24 replies · 1,150+ views
    Science Centric ^ | 10 September 2008 17:00 GMT | Stanislav P. Abadjiev
    The Universe's brightest explosion ever seen was observed on 19 March this year. Now a team of scientists led by Judith Racusin from the Pennsylvania State University and colleagues from around the world have combined their data from satellites and observatories to explain what happened. The observations reveal that the jets of the gamma-ray burst called GRB 080319B were aimed almost directly at the Earth. The event was so intense that, despite happening halfway across the Universe, it could have been seen briefly with the unaided eye.Gamma-ray bursts are the Universe's most luminous explosions. Most occur when massive stars run...
  • New Exotic Particle May Explain Milky Way Gamma-Ray Phenomenon

    08/03/2008 2:06:47 PM PDT · by LibWhacker · 13 replies · 185+ views
    AstroEngine ^ | 7/26/08 | Ian O'Neill
    There is something strange happening in the core of the Milky Way. A space observatory measuring the energy and distribution of gamma-rays in the cosmos has made an unexpected (and perplexing) discovery. It would seem there is a very high proportion of gamma-ray photons emanating from our galactic core with a very distinctive signature; they have a precise energy of 511 keV (8×10-14 Joules), and there’s a lot of them. So what could possibly be producing these 511 keV gamma-rays? It turns out, 511 keV is a magic number; it is the exact rest mass energy of a positron (the...
  • Space telescope recycled for bomb detection

    05/10/2008 12:12:36 AM PDT · by neverdem · 5 replies · 209+ views
    Nature News ^ | 9 May 2008 | Eric Hand
    Compton Gamma Ray Observatory equipment helps to sniff out radioactive sources. Remnants of the Compton Gamma Ray Observatory (pictured), are being used in other fields.NASA The 9-year mission of NASA’s Compton Gamma Ray Observatory ended in 2000 with a plunge into the Pacific Ocean. But its spare parts are living on — as a detector of dirty bombs. James Ryan, an astrophysicist at the University of New Hampshire in Durham, has recycled parts from one of the space telescope’s old instruments, realizing that they can work just as well pointing horizontally as they did vertically up into the heavens. The...
  • 'Death Star' Gamma-Ray Gun Pointed Straight at Earth

    03/05/2008 1:07:09 PM PST · by Squidpup · 110 replies · 1,224+ views
    FoxNews.com ^ | March 5, 2008 | news.com.au
    Earth could be in for a neighborhood dispute with a death star, according to an Australian astronomer. A spectacular rotating pinwheel system just down the astronomical road from Earth — 8,000 light years away — includes an unstable Wolf-Rayet star that could explode. Eight years ago, WR104 was discovered in the constellation Sagittarius by Sydney University astronomer Peter Tuthill. A Wolf-Rayet star is the last step on the way to a supernova — the explosion of a star at the end of its life. Images from the Mauna Kea in Hawaii telescope show that every eight months the two stars...
  • NASA to launch Gammy-ray telescope (GLAST)

    09/19/2007 8:39:59 PM PDT · by NormsRevenge · 6 replies · 169+ views
    AP on Yahoo ^ | 9/19/07 | Alex Dominguez - ap
    GREENBELT, Md. - A new NASA space telescope will give scientists a peek at some of the most energetic objects and events in the universe. The new Gamma-ray Large Area Space Telescope to be launched next spring doesn't see visible light like our eyes, but gamma rays, the most energetic photons in the electromagnetic spectrum. They are produced by black holes, supernovae, neutron stars and other phenomena. GLAST will be the first gamma ray observatory to survey the entire sky. Scientists are hoping it will provide clues about dark matter, the early universe and allow them to test fundamental principles...
  • Supernova caught in its exploding act (NASA SWIFT detects milder gamma-ray burst GRB, X-ray flash)

    08/30/2006 11:46:03 AM PDT · by NormsRevenge · 22 replies · 1,393+ views
    Reuters on Yahoo ^ | 8/30/06 | Reuters
    LONDON (Reuters) - Teams of international scientists have used observations from NASA's Swift satellite and other telescopes to witness the evolution of a cosmic blast into a stellar explosion or supernova. The blast is thought to be a milder type of gamma-ray burst (GRB) -- the most powerful type of explosion known to astronomers -- called an X-ray flash. It is known as GRB060218 after the February 18 date it began in the constellation of Aries about 440 million light years away. A light year is about 6 trillion miles, the distance light travels in a year. "This extends the...
  • Quark soup may cause cosmic flashes

    02/24/2005 12:17:45 AM PST · by LibWhacker · 28 replies · 957+ views
    Nature ^ | 2/23/05 | Philip Ball
    Gamma-ray bursts could be the signature of ultradense stars. This X-ray image shows the 3C58 pulsar, the remnant of a supernova noted on Earth in AD 1181, which astronomers suspect may be a quark star. It lies about 10,000 light years from Earth.© NASA/SAO/CXC/P.Slane et al. Intense flashes of gamma rays in far-off galaxies might be produced by a bizarre kind of star, consisting of phenomenally dense material in which the particles that make up atomic nuclei have fallen apart. Two astrophysicists have proposed that gamma-ray (gamma-ray) bursts, whose origins have foxed astronomers for decades, might be the signatures of...
  • Explosions in the Sky: Supernovae Imminent?

    10/01/2004 12:59:05 PM PDT · by cogitator · 146 replies · 4,407+ views
    SpaceRef ^ | 09/30/2004 | NASA
    After a Trio of Explosions Scientists say Supernova is ImminentThree powerful recent blasts from three wholly different regions in space have left scientists scrambling. The blasts, which lasted only a few seconds, might be early alert systems for star explosions called supernovae, which could start appearing any day. The first two blasts, called X-ray flashes, occurred on September 12 and 16. These were followed by a more powerful burst on September 24. The burst seems to be on the cusp between an X-ray flash and a full-fledged gamma ray burst, a discovery interesting in its own right. If these signals...
  • Astronomy Picture of the Day 01-30-04

    01/30/2004 9:17:26 AM PST · by petuniasevan · 7 replies · 196+ views
    NASA ^ | 01-30-04 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2004 January 30 X-Ray Rings Expand from a Gamma Ray Burst Credit: S. Vaughan, R. Willingale (U. Leicester) et al., XMM, ESA Explanation: Why do x-ray rings appear to emanate from a gamma-ray burst? The surprising answer has little to do with the explosion itself but rather with light reflected off sheets of dust-laden gas in our own Milky Way Galaxy. GRB 031203 was a tremendous explosion --...
  • Did a gamma-ray burst devastate life on Earth?

    09/24/2003 2:05:01 PM PDT · by LibWhacker · 27 replies · 301+ views
    Eurekalert ^ | 9/24/03 | Jeff Hecht
    A DEVASTATING burst of gamma-rays may have caused one of Earth's worst mass extinctions, 443 million years ago. A team of astrophysicists and palaeontologists says the pattern of trilobite extinctions at that time resembles the expected effects of a nearby gamma-ray burst (GRB). Although other experts have greeted the idea with some scepticism, most agree that it deserves further investigation. GRBs are the most powerful explosions known. As giant stars collapse into black holes at the end of their lives, they fire incredibly intense pulses of gamma rays from their poles that can be detected even from across the universe...
  • Astronomy Picture of the Day 4-14-03

    04/14/2003 12:01:31 AM PDT · by petuniasevan · 7 replies · 219+ views
    NASA ^ | 4-14-03 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 April 14 A Gamma Ray Burst - Supernova Connection Credit: Al Kelly (JSCAS/NASA) & Arne Henden (Flagstaff/USNO) Explanation: New evidence has emerged that a mysterious type of explosion known as a gamma ray burst is indeed connected to a supernova of the type visible in the above image. Two weeks ago, the orbiting HETE satellite detected gamma-ray burst GRB030329. The extremely bright burst was found hours later...
  • Astronomy Picture of the Day 3-25-03

    03/24/2003 10:23:19 PM PST · by petuniasevan · 5 replies · 284+ views
    NASA ^ | 3-25-03 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 March 25 A Slow Explosion Credit: Y. Grosdidier (U. Montreal) et al., WFPC2, HST, NASA Explanation: Why would a gamma ray burst fade so slowly? This behavior, recorded last October, is considered a new clue into the cause of gamma-ray bursts, the most powerful explosions known in the universe. The burst, first detected by the orbiting HETE satellite and later tracked by numerous ground-based telescopes, showed an...
  • Astronomy Picture of the Day 12-19-02

    12/19/2002 5:08:57 AM PST · by petuniasevan · 5 replies · 279+ views
    NASA ^ | 12-19-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 December 19 RAPTOR Images GRB 021211Credit: P. Wozniak, W.T. Vestrand, et al., RAPTOR Project, LANL Explanation: On December 11 astronomers found one of the brightest and most distant explosions in the Universe - a gamma-ray burst - hiding in the glare of a relatively nearby star. The earliest image of the burst's visible light was caught by an earthbound RAPTOR (RAPid Telescopes for Optical Response). The two...
  • Astronomy Picture of the Day 9-06-02

    09/06/2002 5:28:04 AM PDT · by petuniasevan · 7 replies · 261+ views
    NASA ^ | 9-06-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 September 6 HESS Gamma-Ray TelescopeCredit: The HESS Collaboration Explanation: Most ground-based telescopes with lenses and mirrors are hindered by the Earth's nurturing, protective atmosphere that blurs images and scatters and absorbs light. But this telescope was designed to detect extreme gamma rays - photons with over 100 billion times the energy of visible light - and actually requires the atmosphere to operate. As the gamma rays impact...