Free Republic 1st Quarter Fundraising Target: $88,000 Receipts & Pledges to-date: $21,387
Woo hoo!! And the first 24% is in!! Thank you all very much!!

Keyword: gammaray

Brevity: Headers | « Text »
  • New detector perfect for asteroid mining, planetary research

    11/21/2015 8:16:42 AM PST · by Red Badger · 9 replies ^ | November 20, 2015 | by David Salisbury & Provided by: Vanderbilt University
    Concept of an asteroid redirect mission. Credit: NASA ==================================================================================================================================== The grizzled asteroid miner is a stock character in science fiction. Now, a couple of recent events - one legal and the other technological - have brought asteroid mining a step closer to reality. The legal step was taken when the Senate Commerce, Science and Transportation Committee passed a bill titled H.R. 2262—SPACE Act of 2015. The bill has a number of measures designed to facilitate commercial space development, including a provision that gives individuals or companies ownership of any material that they mine in outer space. According to one estimate,...
  • Astronomy Picture of the Day -- Gamma-ray Rain from 3C 279

    07/22/2015 4:28:31 AM PDT · by SunkenCiv · 5 replies
    NASA ^ | July 22, 2015 | (see photo credit)
    Explanation: If gamma-rays were raindrops a flare from a supermassive black hole might look like this. Not so gently falling on the Fermi Gamma-ray Space Telescope from June 14 to June 16 the gamma-ray photons, with energies up to 50 billion electron volts, originated in active galaxy 3C 279 some 5 billion light-years away. Each gamma-ray "drop" is an expanding circle in the timelapse visualization, the color and maximum size determined by the gamma-ray's measured energy. Starting with a background drizzle, the sudden downpour that then trails off is the intense, high energy flare. The creative and calming presentation of...
  • 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 · 64 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 ^ | 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 · 31 replies
    PhysOrg ^ | 11-20-2012
    (—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 ^ | 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 ^ | 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 ^ | 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...