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Latest Gamma-ray burst Stories

Image 1 - Gamma-ray Burst Reveals Surprising Ingredients Of Early Galaxies
2011-11-02 05:50:51

An international team of astronomers has used the brief but brilliant light of a distant gamma-ray burst as a probe to study the make-up of very distant galaxies. Surprisingly the new observations, made with ESO´s Very Large Telescope, have revealed two galaxies in the young Universe that are richer in the heavier chemical elements than the Sun. The two galaxies may be in the process of merging. Such events in the early Universe will drive the formation of many new stars and may be the...

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2011-10-18 09:45:39

[ Watch the Video ] NASA's Fermi team recently released the second catalog of gamma-ray sources detected by their satellite's Large Area Telescope (LAT). Of the 1873 sources found, nearly 600 are complete mysteries. No one knows what they are. "Fermi sees gamma rays coming from directions in the sky where there are no obvious objects likely to produce gamma rays," says David Thompson, Fermi Deputy Project Scientist from Goddard Space Flight Center. Gamma rays are by their very nature...

2011-10-07 09:02:35

News About Planet-Threatening Events Space is a violent place. If a star explodes or black holes collide anywhere in our part of the Milky Way, they´d give off colossal blasts of lethal gamma-rays, X-rays and cosmic rays and it´s perfectly reasonable to expect Earth to be bathed in them. A new study of such events has yielded some new information about the potential effects of what are called “short-hard” interstellar radiation events. Several studies in the past...

Image 1 - Balloon-based Experiment To Measure Distant Gamma Rays
2011-09-18 05:04:59

  Beginning Sunday, September 18, 2011 at NASA's launch facility in Fort Sumner, New Mexico, space scientists from the University of New Hampshire will attempt to send a balloon up to 130,000 feet with a one-ton instrument payload to measure gamma rays from the Crab Pulsar, the remains of a supernova explosion that lies 6,500 light years from Earth. The launch is highly dependent on weather and wind conditions, and the launch window closes at the end of next week. The Gamma Ray...

Image 1 - Fermi Census Highlights Cosmic Mysteries
2011-09-11 04:32:43

  Every three hours, NASA's Fermi Gamma-ray Space Telescope scans the entire sky and deepens its portrait of the high-energy universe. Every year, the satellite's scientists reanalyze all of the data it has collected, exploiting updated analysis methods to tease out new sources. These relatively steady sources are in addition to the numerous transient events Fermi detects, such as gamma-ray bursts in the distant universe and flares from the sun. Earlier this year, the Fermi team...

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2011-05-26 07:25:00

A cataclysmic explosion of a huge star near the edge of the Universe may be the most distant object ever observed. Scientists believe the blast occurred about 520 million years after the Big Bang. This means its light has taken 13.14 billion years to reach Earth. Astronomers refer to the event, which was observed by using NASA's Swift space observatory, as GRB 090429B. The "GRB" stands for "gamma-ray burst", which is a sudden pulse of very high-energy light that the telescope is tuned to...

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2011-05-11 12:55:00

A gamma-ray burst released by the Crab Nebula on April 12 has shocked astronomers, reports BBC News. The Crab Nebula was once thought to be the steadiest high-energy source in the sky. "For 40 years, most astronomers regarded the Crab as a standard candle," Colleen Wilson-Hodge, an astrophysicist at NASA's Marshall Space Flight Center in Huntsville, Ala., said in a previous statement posted in January. "Now, for the first time, we're clearly seeing how much our candle flickers," she said....

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2011-04-28 06:20:00

A new study found that the first stars in the universe were not only massive, but also fast-spinning. These stars died out long ago, but astronomers are able to see what they were like by looking at later generations of stars. Cristina Chiappini of the Astrophysical Institute Potsdam in Germany, and colleagues reanalyzed data from the Very Large Telescope of a 12-billion-year-old star cluster.  The team found high levels of metal in the stars. These levels suggest earlier generations...

2011-04-07 10:38:00

WASHINGTON, April 7, 2011 /PRNewswire-USNewswire/ -- A new supercomputer simulation shows the collision of two neutron stars can naturally produce the magnetic structures thought to power the high-speed particle jets associated with short gamma-ray bursts (GRBs). The study provides the most detailed glimpse of the forces driving some of the universe's most energetic explosions. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) The state-of-the-art simulation ran for nearly...


Latest Gamma-ray burst Reference Libraries

7_7ab115b117284658644e345b89f5ba712
2004-10-19 04:45:43

Gamma-Ray Astronomy -- Gamma-ray astronomy is the astronomical study of gamma rays. Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Feenberg and Primakoff in 1948, Hayakawa and Hutchinson in 1952, and, especially, Morrison in 1958 had led scientists to believe that a number of different processes which were occurring in the universe would result in gamma-ray emission. These...

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2004-10-19 04:45:41

Hypernova -- A hypernova is a theoretical type of supernova produced when exceptionally large stars collapse at the end of their lifespan. In a hypernova, the core of the star collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly light speed. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. Theorists have come up with several plausible explanations for hypernovae. It may...

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2004-10-19 04:45:41

Gamma-Ray Burst -- In astronomy, Gamma-ray bursters (GRBs) are flashes of gamma rays that last from seconds to hours, the longer ones being followed by several days of X-ray afterglow. They occur at random positions in the sky several times each day. They are now believed to result from tremendous explosions in far away galaxies, during the creation of a black hole from a dying star or two colliding neutron stars. The black hole, surrounded by a rotating disk of matter falling into it,...

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Word of the Day
glogg
  • Scandinavian punch made of claret and aquavit with spices and raisins and orange peel and sugar.
This word comes from the Swedish 'glogg,' which is an alteration of 'glodgat,' mulled (wine).
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