VIDEOS. Comet Ison have survived his appointment with the ... - Le Parisien

Comet Ison would not have burned the wings. While she was announced dead much of the day Friday, “scientists estimate that the comet nucleus is still intact,” says “Sciences et Avenir” associated with the Nouvel Observateur.

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Two hours have approached near to a little over a million miles from the surface of the sun, the comet is not returned within the scope of both Soho and Stereo our planet probes, according to the “Figaro “. Most astronomers had predicted qu’Ison not survive this close flyby of the sun. “I think there may be a 30% chance” that it will survive, said Tuesday Carey Lisse, an expert on comets American Applied Physics Laboratory Johns Hopkins.

“This comet is not very strong, it is made of 50% or maybe 30% water ice, “and the kernel size is quite small compared to the average of comets observed so far, explained the scientist, saying that its diameter was estimated at 1.2 km maximum.

But against (almost all expectations), it would have survived, “but it is not clear that the comet is yet in one piece … “after” Science and Life “.

An animation of NASA and ESA (European Space Agency) shows the passage of the comet at ISON closer to the sun:

“A relic of the formation of the solar system”

Ison has mobilized the astronomical community since its discovery in September 2012 by Russian astronomers because it goes back to the origins of the solar system there are 4.5 billion years. It is a breakaway because there a few million years, the Oort cloud, a sort of “parking” of comets to the outer solar system, midway between the sun and the next star. “This is a relic of the formation of the solar system,” said Carey Lisse, stressing that the planets were formed with comets that particular brought water, hence the great importance of these celestial bodies. “This comet has a very great interest to us” because very few comets from as far away in the solar system is discovered, had said James Green, head of planetary science at NASA.

VIDEO. Ison seems to dislocate near the sun (Photo NASA)

Erratic behavior in recent days

Some astronomers had first thought qu’Ison was large, with a core of several kilometers in diameter. But when the comet passed very close to Mars, a Mars orbiter NASA could take pictures indicating a maximum diameter of only 1.2 km, below the average of most comets. Ison was detected far into the solar system, astronomers have had ample time to observe. Their measurements showed that in particular its core was wrapped in a cloud of carbon dioxide (CO2). “It seems that CO2 may have been a key molecule in the early solar rather than carbon monoxide system,” according to Carey Lisse.

So qu’Ison approached the sun, fluctuations in its tail showed the otherwise invisible movements of the solar wind ejected continuously formed by the sun particles. These days, Ison showed erratic behavior, shiny stronger before fall sharply light intensity, leading astronomers to wonder if the comet had not already disintegrated.

If Ison survived the dream of thousands of astronomers who relied turn their eyes towards the sky during the night of Christmas may be able to achieve.

VIDEO. The simulation of the passage near the sun Ison

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