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Comet Ison seen from a NASA telescope on November 19. Photography: Aaron Kingery / Nasa / EPA A comet that left the outer edge of the solar system more than 5.5 million years ago, now passing close to the sun on Thursday, and may become visible from Earth in the next week or two if she survives. Ison comet should pass 730,000 miles from the surface of the sun at 06:37 GMT on Thursday. At this distance, cheaptickets the comet will reach temperatures cheaptickets near 2760 C (5000 F), hot enough to vaporize not only ice in the body of the comet, but also dust and rocks. Professor Tim O'Brien, associate director of the Jodrell Bank Observatory, told the BBC:. . "It's like throwing a snowball on fire will be difficult for him to survive. Fortunately, it is a large object and it moves fast, so I will not spend much time near the sun. There is a lot of uncertainty." Donald cheaptickets Yeomans, the program object near Earth, NASA said in an interview published in the space agency's site interview:. "There are three possibilities when this comet rounds the sun" can be tough enough to survive the passage of the sun and be an object the naked eye quite bright, "he said. Alternatively, the gravity cheaptickets of the sun could rip apart Ison, creating several large pieces, or the comet can be divided into a cloud of dust. Carey Lisse, senior research scientist at the lab Johns Hopkins Applied Physics, said: ".. This comet is giving us a smooth ride. It will be difficult to predict exactly what is happening as a betting man, I think it will not survive the solar passage. "Scientists estimate that Ison need to have about 200 feet in diameter to survive its close encounter with the sun. More recent measurements indicate that the comet is more than twice the size, and perhaps as large as 1,200 meters diameter. When it closes around the sun it will be moving at about 217 miles per second. Comet was discovered last year by two amateur astronomers using the International Scientific Optical Network Russia, or Ison. was unusually bright at the time considering their great distance beyond the orbit of Jupiter, raising the prospect of a truly cosmic spectacle when it approaches the sun. Heat from the sun causes the ice in the body of a comet to vaporize, creating characteristic bright cheaptickets tails and bodies bright nebulae for the future. Closest Comets come for the sun, which shines brighter, depending on the amount of ice they contain. Comets are believed to have frozen debris left over from the formation of the solar system 4.5 billion years ago.'s family comets that Ison is lies in the Oort cloud, located about 10,000 times farther from the Sun than the Earth, halfway to the next star. Occasionally a comet is gravitationally nudged out of the cloud by a star passage and a flight path that millions of years later takes you to the inner solar system. Computer models show that Ison is a first-time visitor. "you need comets in order to build planets and this comet is in deep freeze in the Oort cloud, the last 4.5 billion years, "said Lisse." Comet Ison is a relic. It is a dinosaur bone formation of the solar system. "Comets Oort Cloud walked the earth before-grazing comets cheaptickets and the sun are common. Comet Ison, however, is unique." We have never seen such a comet, a comet that is at once new dynamically from the Oort cloud and on-orbit passes along by the sun, "said Karl Battams, an astrophysicist at the Naval Research Laboratory in Washington." has been behaving strangely ", Battams said, noting recent eruptions and changes in brightness that can be signs that the comet is fragmenting. Whatever happens, "he has been a great victory for science," he said.
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