Autor Tópico: Asteroid could hit Mars in January  (Lida 1693 vezes)

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Offline rogercrespo

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Asteroid could hit Mars in January
« em: Dezembro 21, 2007, 04:56:41 pm »
Aqui está uma notícia que a confirmar é bastante interessante...


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A newly discovered hunk of space rock has a 1 in 75 chance of slamming into the red planet on January 30, scientists said Thursday.

"These odds are extremely unusual. We frequently work with really long odds when we track ... threatening asteroids," said Steve Chesley, an astronomer with the Near Earth Object Program at NASA's Jet Propulsion Laboratory.

The asteroid, known as 2007 WD5, was discovered in late November and is similar in size to an object that hit remote central Siberia in 1908, unleashing energy equivalent to a 15-megaton nuclear bomb and wiping out 60 million trees.

Scientists tracking the asteroid, currently halfway between Earth and Mars, initially put the odds of impact at 1 in 350 but increased the chances this week. Scientists expect the odds to diminish again early next month after getting new observations of the asteroid's orbit, Chesley said.

"We know that it's going to fly by Mars and most likely going to miss, but there's a possibility of an impact," he said.

If the asteroid does smash into Mars, it will probably hit near the equator close to where the rover Opportunity has been exploring the Martian plains since 2004. The robot is not in danger because it lies outside the impact zone. Speeding at 8 miles a second, a collision would carve a hole the size of the famed Meteor Crater in Arizona.

In 1994, fragments of the comet Shoemaker-Levy 9 smacked into Jupiter, creating a series of overlapping fireballs in space. Astronomers have yet to witness an asteroid impact with another planet.

"Unlike an Earth impact, we're not afraid, but we're excited," Chesley said
Fonte da notícia:

http://edition.cnn.com/2007/TECH/space/12/21/mars.asteroid.ap/index.html

Abraço
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Offline João Clérigo

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Re: Asteroid could hit Mars in January
« Responder #1 em: Dezembro 21, 2007, 07:26:06 pm »
« Última modificação: Janeiro 01, 1970, 01:00:00 am por Guest »
Cumprimentos,
João Clérigo

Re: Asteroid could hit Mars in January
« Responder #1 em: Dezembro 21, 2007, 07:26:06 pm »

Offline Orion_PKFD

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Re: Asteroid could hit Mars in January
« Responder #2 em: Dezembro 21, 2007, 07:36:52 pm »
Citação de: "jaclerigo"
Outra fonte: S&T http://www.skyandtelescope.com/news/home/12713937.html

Pois...foi aí q vi a noticia...mas msm se bater em Marte nao sera observavel com as nossas bazucas :s
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Offline Orion_PKFD

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Re: Asteroid could hit Mars in January
« Responder #3 em: Janeiro 12, 2008, 11:58:09 am »
Actualizaçao

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Mars Dodges a Bullet

Word from the orbit gurus at the Jet Propulsion Laboratory is that the impact watch for Mars is officially "off." On January 9th they announced that the odds of tiny 2007 WD5 crashing into Mars on January 30th have dropped precipitously, to about 1 in 10,000 (0.01%). Instead, the two should come no closer than about 16,000 miles.

This near miss was the likely outcome all along, but uncertainty remained until some big telescopic guns weighed in earlier this week with updated tracking observations. Estimated to be no more than 150 feet across, the asteroid is a dim 24th-magnitude blip and getting fainter as it moves outward from Earth and toward Mars.

Over the past few weeks astronomers have responded to this "will it or won't it?" situation just as they should have. A possible impactor was found, its projected track (though wildly uncertain) showed that a collision couldn't be ruled out, and the call went out for additional observations that eventually settled the matter.

Because the drama surrounding 2007 WD5 played out 50 million miles away, we were all spared the sensational news-media hype that usually surrounds these "killer asteroid" stories.

In discussions among the scientists involved, a few hold the opinion that the public becomes needlessly agitated when they learn that some space rock has a 1-in-XXXX chance of hitting Earth, only to learn later that additional observations have ruled it out. Others say that being able to watch the probability game play out is a good thing, a demonstration of how science actually "works."

Fonte:http://www.skyandtelescope.com/news/13705922.html

Parece que ja nao vai haver fogo de artificio :-D

Cumps
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Re: Asteroid could hit Mars in January
« Responder #3 em: Janeiro 12, 2008, 11:58:09 am »