The Biggest Starquake Ever

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The biggest starquake ever recorded resulted in oscillations in the X-ray emission from the shaking neutron star. Astronomers hope these oscillations will crack the mystery of what neutron stars are made of. • On December 27, 2004, several satellites and telescopes from around the world detected an explosion on the surface of SGR 1806-20, a neutron star 50,000 light years away. The resulting flash of energy -- which lasted only a tenth of a second -- released more energy than the Sun emits in 150,000 years. • Combing through data from NASA's Rossi X-ray Timing Explorer, a team of astronomers has identified oscillations in the X-ray emission of SGR 1806-20. These rapid fluctuations, which began 3 minutes after the starquake and trailed off 10 minutes later, had a frequency of 94.5 Hertz. • This is near the frequency of the 22nd key of a piano, F sharp, said Tomaso Belloni from Italy's National Institute of Astrophysics. • Just as geologists study the Earth's interior using seismic waves after an earthquake, astrophysicists can use the X-ray oscillations to probe this distant neutron star. • This explosion was akin to hitting the neutron star with a gigantic hammer, causing it to ring like a bell, said Richard Rothschild from the University of California, San Diego. Now the question is: what does the frequency of the neutron star's oscillations -- the tone produced by the ringing bell -- mean? • Neutron stars form when a massive star runs out of nuclear fuel to burn. Under the weight of its own gravity, the star's core collapses into either a dense neutron star, or an even denser black hole. • दोस्तों क्या आपको पता है 27 December, साल 2004 को एक स्टारक्वेक यानि तारोकाकम्प हुआ था? जिससे earth का सारे radio communications कुछ समय के लिए अचानक बंद हो गया था? ये starquake SGR 1806 20 magnetar में हुआ था, और इसके कारण जो विस्फोट हुआ था वो हमारे solar system के बहार से आता हुआ अब तक का सबसे चमकीला विस्फोट था। हालाकि 50,000 प्रकाश-वर्ष की दूरी पर भी, इसकी Gamma Rays और एक्स-रे के burst ने पृथ्वी के आयनमंडल को disturbed कर दिया था। मैग्नेटर एक super dense neutron स्टार है, जिसका चुंबकीय क्षेत्र पृथ्वी की तुलना में हजारों मिलियन गुना अधिक तीव्र होता है। वैज्ञानिकों का मानना है कि, SGR 1806 20 की ऊर्जा का विशाल विस्फोट, वही starquake की वजह से हुआ था. • ‪@AyEsciEncE_World‬ ‪@AyE_sciEncE‬

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