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-   -   do you think an Asteroid will hit Earth in the 21st century ? (https://gfy.com/showthread.php?t=648605)

polish_aristocrat 12-30-2006 06:08 PM

Quote:

Originally Posted by Dragar (Post 11614646)
I'll be dead by then so no biggy to me :pimp

well, you don't know it

chances of a big (1 mile / 1kilometer+) asteroid or comet hitting Earth in the 21st century are extremely small. Such events happen once every milion years or so...

BUT

Quote:

A near earth Object (NEO) does not need to be large to devastate. One the size of a small garage would annihilate a large city. One big enough to leave a 10km crater, still nowhere near the size of the biggest (there is a 300km crater on Earth), would have the destructive force of every one of the world's 10,000 nuclear warhead combined.

(...)

How often is Earth hit by an asteroid?

More frequently than you may think. An incident like Tunguska occurs approximately once per every hundred years. Smaller ones, but easily big enough to take out a large city, occur at least 3 times per century, for example Brazil in 1930. While most of the recent recorded impacts have happened in places that were barely inhabited, we won't always be that lucky. If the Tunguska event had happened over the city of New York it would have been nearly leveled.

more info here http://www.armageddononline.org/asteroid.php

Mr Pheer 12-30-2006 06:22 PM

I still hope one hits this evening.

Alky 12-30-2006 08:29 PM

What I don't understand is from this site: http://neo.jpl.nasa.gov/torino_scale.html

Level 8
Quote:

A collision is certain, capable of causing localized destruction for an impact over land or possibly a tsunami if close offshore. Such events occur on average between once per 50 years and once per several 1000 years.
but then on the other link posted in the thread, for the next hundred years it shows only the maximum on the Torino scale as 1.

Seems a bit off if you ask me...

polish_aristocrat 01-19-2007 05:34 PM

Quote:

Originally Posted by Alky (Post 11623024)
What I don't understand is from this site: http://neo.jpl.nasa.gov/torino_scale.html

Level 8


but then on the other link posted in the thread, for the next hundred years it shows only the maximum on the Torino scale as 1.

Seems a bit off if you ask me...

The thing is that not all asteroids has been discovered. From the ones that has been discovered, there's currently no real risk that one of them will hit Earth in the 21st century.

check out this page for more explanation about NEO'S - Near Earth Objects

http://impact.arc.nasa.gov/intro_faq.cfm


some quotes:


Quote:

What size NEOs are dangerous?

The Earth's atmosphere protects us from most NEOs smaller than a modest office building (40 m diameter, or impact energy of about 3 megatons). From this size up to about 1 km diameter, an impacting NEO can do tremendous damage on a local scale. Above an energy of a million megatons (diameter about 2 km), an impact will produce severe environmental damage on a global scale. The probable consequence would be an "impact winter" with loss of crops worldwide and subsequent starvation and disease. Still larger impacts can cause mass extinctions, like the one that ended the age of the dinosaurs 65 million years ago (15 km diameter and about 100 million megatons).


How many NEOs exist?

There are many more small NEOs than large ones. Astronomers estimate that there are approximately 1100 Near Earth Asteroids (NEAs) larger than 1 km in diameter, and more than a million larger than 40 m in diameter (the approximate threshold for penetration through the Earth's atmosphere).

Are any NEOs predicted to hit the Earth?

As of the end of 2004, astronomers had discovered more than two thirds of the larger Near Earth Asteroids (diameter greater than 1 km). None of the known asteroids is a threat, but we have no way of predicting the next impact from an unknown object.

What is the risk of impacts?

We don't know when the next NEO impact will take place, but we can calculate the odds. Statistically, the greatest danger is from an NEO with about 1 million megatons energy (roughly 2 km in diameter). On average, one of these collides with the Earth once or twice per million years, producing a global catastrophe that would kill a substantial (but unknown) fraction of the Earth's human population. Reduced to personal terms, this means that you have about one chance in 40,000 of dying as a result of a collision.

How much warning will we have?

With so many of even the larger NEOs remaining undiscovered, the most likely warning today would be zero -- the first indication of a collision would be the flash of light and the shaking of the ground as it hit.

What about smaller, more frequent impacts?

The Spaceguard Survey and most associated search and tracking programs are concentrating on NEAs larger than 1 km in diameter -- large enough to risk a global ecological catastrophe if one of them hit the Earth. But there are many more smaller undiscovered NEAs, and we are likely to be hit somewhere on Earth by one of these, with an energy equivalent to a large nuclear bomb, sometime in the next couple of centuries.
The last such impact was in 1908 in Tunguska ( Siberia ) with an estimated explosive energy of 15 megatons. In 2003 NASA completed a study of these sub-km impacts and concluded that it was both technically feasible and cost-effective to to mount an expanded Spaceguard Survey, with much larger telescopes, to search for these smaller asteroids.

Jim_Gunn 01-19-2007 06:02 PM

Quote:

Originally Posted by notabook (Post 11616386)
We do not have such advanced genetic technology at our disposal at this present date and time.

The human species could probably be sustained with even a small surviving population without scientific genetic intervention. In pre-history, there was a time where the entire human population was reduced to as few as 10,000 individuals worldwide due to climate change and other factors. Scientists know this because of markers and similarities on human genes genes from that time period. It's not ideal, but it could conceivably work. Hope we never have to find out.

4Man 01-19-2007 06:08 PM

I don't wona think about that...

shekinah 01-19-2007 06:27 PM

Maybe that would happen when I leave the earth:1orglaugh

polish_aristocrat 01-30-2007 04:03 PM

bump ;)
 
Astronaut touts asteroid-bumping mission


Quote:

HONOLULU - NASA astronaut Edward Lu is campaigning for a new spacecraft that would divert asteroids on a path to slam into Earth.

The small space tractor, costing between $200 million and $300 million, would hover near an asteroid to exert enough gravitational pull that the space rock's orbit would change and a collision with our planet would be averted, Lu told an audience at the University of Hawaii-Manoa Monday night.

"We're only trying to get a really tiny change in the velocity of the asteroid to prevent an impact," said Lu, a former University of Hawaii solar physicist.

Lu was part of a panel including three Hawaii scientists who characterized the chances of an asteroid colliding with Earth as rare but deserving of the same level of attention as major earthquakes, tsunamis and hurricanes.

The asteroid Apophis will pass within about 20,000 miles of Earth on Friday, April 13, 2029.

"It's going to come so close to the Earth in 2029 that its orbit will change, and it might change enough so that it comes back and hits us in 2036," said Hawaii planetary scientist David Tholen, who discovered Apophis.
http://www.msnbc.msn.com/id/16788616/

WZRogeR 01-30-2007 05:45 PM

Maybe this is Inevitability.

WZRogeR 01-30-2007 05:46 PM

Though procent is little

WZRogeR 01-30-2007 05:50 PM

i somewere read he though 4km

WZRogeR 01-30-2007 05:51 PM

Armageddon?Call bruce willis:)

Tiffany Preston 01-30-2007 06:46 PM

Quote:

Originally Posted by polish_aristocrat (Post 10708642)
anyone here interested a little in this subject?

from what I know, the chances for a big collision are minimal because they happen once every few millions years, but f.e chances for an impact similar in scale to the Tunguska Event aren't that small.....

Dont want to Scared you but they have already predict a collision in the next few century ! They have already an eye on the asteroid! Push your research on the nasa website and you will see!

lorine 01-31-2007 03:56 PM

It happened in the past. Sooner or later it will happen again,it`s only a matter of time. Let`s hope it will be a small one and also let`s hope it will fall into a ocean or a sea and won`t kill people

polish_aristocrat 03-23-2007 09:53 AM

Quote:

Originally Posted by lorine (Post 11827832)
It happened in the past. Sooner or later it will happen again,it`s only a matter of time. Let`s hope it will be a small one and also let`s hope it will fall into a ocean or a sea and won`t kill people

a big asteroid falling into the ocean would cause a mega-tsunami killing millions of people

cool1 03-23-2007 09:59 AM

it will happen, just hope it is not in my time

D 03-23-2007 10:01 AM

Quote:

Originally Posted by polish_aristocrat (Post 10709818)
interesing question is what would happen if a really big asteroid hit Earth and destroyed most of the human civilisation

let's say if 1% of mankind would survive, then how would the "new" civilisation look like f.e 100 years after the impact, assuming the Eart's climate would turn back to what we know today, after few decades

It'd cause a genetic bottleneck, and give our species even less genetic diversity than we have today.

Recently I heard that any 2 people taken from anywhere in the world will have less genetic diversity between them than most random samples of chimpanzees from the same tribe.

Juicy D. Links 04-17-2007 01:05 PM

Quote:

Originally Posted by NoCarrier (Post 10709719)




i have a pet flamingo running around the yard trying to bang my dog

this is all i needed today


http://snappingphotos.com/images/200...4_flamingo.jpg

polish_aristocrat 10-20-2007 10:44 AM

Quote:

New Delhi, Sept. 25: An asteroid three football fields wide might crash into Earth in 2036 seven years after whizzing past the planet closer than some satellites in orbit, a US space scientist said today.

If the asteroid named Apophis passes a specific, small region of space during its close fly-by in 2029, it will return to impact Earth in 2036, said William Ailor, director of the Centre for Orbital and Re-entry Studies with the Aerospace Corporation.

In this small region of space that scientists compare to a ?keyhole?, Earth?s gravity will perturb the asteroid?s trajectory such that the subsequent encounter in 2036 would lead to an impact.

The chance of such an impact is currently predicted to be 1 in 45,000, Ailor said in a talk on Earth-threatening asteroids at the International Astronautical Congress, 2007, in Hyderabad.

?It?s not a civilisation-ender, but if it does strike, it?ll cause significant damage. People alive today ? young people in schools and colleges ? are going to see it go by or will have to deal with it,? Ailor told The Telegraph in an interview.

Further observations of Apophis in 2012 and 2013 will allow scientists to recalculate the chance of an impact.

?The probability of impact could go up or come down,? Ailor said.

In 2029, Apophis will get closer than some geostationary satellites parked about 37,000km above Earth. A realisation at that time that it will impact in seven years would give scientists too little time to prepare, Ailor said
full article

http://www.telegraphindia.com/107092...ry_8362339.asp

I also read recently in an offline magazine that an impact with a few kilometers big object could eventually totally eliminate not only our civilisation but whole life on earth... in worst case scenario.

Basically Earth would become a second Vernus. :helpme

oh, I forgot this quote

Quote:

Over the past eight years, a concerted search has helped find 90 per cent of the asteroids 1km and larger ? the civilisation-killers. ?But we have yet to find some 20,000 objects between 300 metres and 140 metres,? Ailor said

polish_aristocrat 10-20-2007 10:47 AM

shit, I need to double my income, retire from GFY and put my energy into studying asteroids and comets :glugglug

polish_aristocrat 10-20-2007 11:04 AM

best vid yet on the subject

https://youtube.com/watch?v=vdSTE...elated&search=

[ScreaM] 10-20-2007 11:17 AM

The only thing that will hit is would be our own stupidity - nuclear power.

Angie77 10-21-2007 09:25 AM

No, I don't think so.

Bird 10-21-2007 09:45 AM

We will be underground due to global warming long before an asteroid/comet hits.

I believe its going to be a comet like shoemaker leve 9 that hit jupiter in 94.

I say a huge comet is what hit the earth and left a big snow ball on top of antartica as well as split the super content in to 7.

we should survive but end up being mutated in to a totally different being as we adapt to the changes.

Star 69 10-21-2007 10:02 AM

Quote:

Originally Posted by fulyngu (Post 10709330)
Funny... I just watched a show today about the Mayan calendar and how it stops on Dec 21, 2012... Hmmm...

Oh shit, sounds bad

D 10-21-2007 11:39 AM

The real worry comes from comets.

Most of the asteroids that can cause catastrophic damage have been found, and are currently being charted. We have a near-miss expected for sometimes around 2035, if I recall correctly, but that's all we got for this century.

A comet, however, could come at us at any time with little to no warning, and be just as if not more dangerous than a lot of the asteroids we've charted.

polish_aristocrat 10-06-2008 01:49 PM

Quote:

For the first time, astronomers have found an object on a certain collision course with Earth. Fortunately, it is so small it is not expected to cause any damage, burning up in the atmosphere somewhere above northern Sudan in the wee hours of Tuesday morning. It may, however, produce a brilliant 'shooting star'.
The space rock, dubbed 8TA9D69, was first spotted on Monday in a survey by the Mt Lemmon Observatory near Tucson, Arizona.
Its brightness suggests it is no more than about 5 metres across – so small it will likely be destroyed in the atmosphere, says Andrea Milani Comparetti of the University of Pisa in Italy.
Rocks of such size are thought to hit the atmosphere every few months, says Steve Chesley, an astronomer at NASA's Jet Propulsion Laboratory.
"The event is not unusual – what is unique is that it's been predicted beforehand," Milani told New Scientist. "This is the first time we see something arriving, compute that it's going to impact, and announce it is going to impact before it happens."
The rock is due to hit the atmosphere above northern Sudan on Tuesday at 0246 GMT. It will be travelling from west to east, and may be visible from a few hundred kilometres away.
more here: Space rock found on collision course with Earth

theharvman 10-06-2008 01:55 PM

2012... its all relying on 2012.

jollyperv 10-06-2008 01:58 PM

not sure if this was posted yet, don't have time to read this whole thread.

http://www.godlikeproductions.com/fo...sage627749/pg1

CaptainHowdy 10-06-2008 03:11 PM

Hopefully ...

O MARINA 10-06-2008 03:28 PM

:2 cents:


Quote:

Originally Posted by polish_aristocrat (Post 13262913)
best vid yet on the subject




http://www.gfy.com/image.php?u=12350...ine=1205931938





minion

Bojangles 10-06-2008 03:36 PM

Quote:

Originally Posted by polish_aristocrat (Post 10712421)

Cool shit.

Bird 10-06-2008 04:23 PM

Quote:

Originally Posted by Ron Bennett (Post 10709193)
I worry more about the human made type of falling objects, such as frozen toilet waste from jetliners.

Ron

Like on Joe dirt

Kudles 10-07-2008 11:11 AM

I really hope not

bronco67 10-07-2008 03:39 PM

If we do get hit, just hope you get vaporized in the initial impact. Otherwise, a few years later, while you're scavenging the wasteland for food and fuel, Lord Humungus and his gang will rape your wife and beat you severely around the face and neck until you die a slow death.


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