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Jet Creation
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Symmetry Breaking and the Crab Nebula
The connection between superfluidity and symmetry breaking has had a glorious history. It has left us a rich legacy of fertile ideas, that seems far from exhaustion. PG 60 Superfluidity and Symmetry Breaking You know while there have been processes unfolding with regard to supersymmetry, for the life of it, I am having a hard…
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A Jet in the Milky Way
Composite image of Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way. Image Credit: X-ray: NASA/CXC/UCLA/Z. Li et al; Radio: NRAO/VLA Astronomers have long sought strong evidence that Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, is producing a jet of high-energy…
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Glowing Blackholes
(Courtesy: NASA E/PO, Sonoma State University, Aurore Simonnet) The birth of a black hole may be signalled by a characteristic cosmic flash, according to researchers in the US. It was previously thought that only the most massive of black holes would produce gamma-ray bursts – narrow beams of electromagnetic radiation that shoot out of the…
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GRB 130427A: Highest-energy Light Ever Detected
The maps in this animation show how the sky looks at gamma-ray energies above 100 million electron volts (MeV) with a view centered on the north galactic pole. The first frame shows the sky during a three-hour interval prior to GRB 130427A. The second frame shows a three-hour interval starting 2.5 hours before the burst,…
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The Developmental Jet Process
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Small Big Bangs?
Gamma-ray bursts. We tend to think of them as big explosions – but it has been suggested that they might actually be Small Bangs. Credit: NASA. Most gamma-ray bursts come in two flavors. Firstly, there are long duration bursts which form in dense star-forming regions and are associated with supernovae – which would understandably generate…
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Crab Nebula
This is a mosaic image, one of the largest ever taken by NASA’s Hubble Space Telescope of the Crab Nebula, a six-light-year-wide expanding remnant of a star’s supernova explosion. Japanese and Chinese astronomers recorded this violent event nearly 1,000 years ago in 1054, as did, almost certainly, Native Americans. The orange filaments are the tattered…
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Fermi Records Lighthouse Effect
John Keats talked of “unweaving the rainbow”, suggesting that Newton destroyed the beauty of nature by analysing light with a prism and splitting it into different colours. Keats was being a prat. Physicists also smile when we see rainbows, but our emotional reaction is doubled by our understanding of the deep physics relating to the…
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Glast now Known as "Fermi Gamma-ray Space Telescope"
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Spherical Cows
Cartoon Model of a SNR(Supernova Remnants) When scientists refer to a spherical cow, we are poking fun at ourselves. We are admitting that some of our models or descriptions of things are far more simple than the actual object, like to say that a cow has a spherical shape. The phenomena we study are often…
