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[Cnet] Giant asteroid to get closer than moon - Page 11

post #101 of 110
Quote:
Originally Posted by homestyle View Post
When asteroids are within feet of hitting earth, even a small amount of mass (1% of our solar system) not calculated on the force of an asteroid over 100 years will make a huge impact (pun intended).

Moreover, the possibility still exists that there can be a stray asteroid not caught in orbit around any large bodies near our solar system that can be misdirected from dark matter far away from us.

More importantly, your bolded statement is false.
No asteroid is within feet of hitting earth. Not even within thousands of feet.

Moreover, all asteroids (At least the ones that are moving) all orbit the sun, as there is no other source of gravity even remotely close to the sun.

As to the last, I should not have spoken authoritatively, because dark matter COULD be anything, but most forms of mass that we know of do reflect light, even if they don't produce it (With the exception of black holes I suppose.) So yes, if there was "Dark matter" close to us, it is very possible the sun would illuminate it.
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post #102 of 110
Arguing about dark matter.. We don't even know what it is, lol. We only have theories, that are likely to be false.

Quote:
Originally Posted by charlesquik View Post
remember what happened to dinosaur... if the blast dont wipe all the life, it cause dust and the sun no longer get on the planet... no more food = everyone die
This is only around 500-800 megatons, only 10+ times bigger than the Tsar Bomba. It's only going to cause a large richer scale 6-7 earthquake in the nearby area if it hits land, and a utterly massive 300m+ tsunami if it hits water.

This won't have any global effects on the weather, etc.

The one that wiped dinosaurs had an impact equivalent to a 1 teraton of TNT. Do you know how much that is?

That's 1,000,000 megatons.
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post #103 of 110
Quote:
Originally Posted by Devilmaypoop View Post
This is only around 500-800 megatons, only 10+ times bigger than the Tsar Bomba. It's only going to cause a large richer scale 6-7 earthquake in the nearby area if it hits land, and a utterly massive 300m+ tsunami if it hits water.

This won't have any global effects on the weather, etc.

The one that wiped dinosaurs had an impact equivalent to a 1 teraton of TNT. Do you know how much that is?

That's 1,000,000 megatons.
Err, I think your assumptions are a little bit downplayed...

Quote:
Although simplistic fireball calculations predicted the fireball would impact the ground, the bomb's own shock wave reflected back and prevented this.[7] The fireball reached nearly as high as the altitude of the release plane and was seen almost 1,000 kilometres (620 mi) from ground zero. The subsequent mushroom cloud was about 64 kilometres (40 mi) high (nearly seven times the height of Mount Everest), which meant that the cloud was well inside the Mesosphere when it peaked. The base of the cloud was 40 kilometres (25 mi) wide. All buildings in the village of Severny (both wooden and brick), located 55 kilometres (34 mi) from ground zero within the Sukhoy Nos test range, were completely destroyed. In districts hundreds of kilometers from ground zero, wooden houses were destroyed, and stone ones lost their roofs, windows and doors; and radio communications were interrupted for almost one hour. One participant in the test saw a bright flash through dark goggles and felt the effects of a thermal pulse even at a distance of 270 kilometres (170 mi). The heat from the explosion could have caused third-degree burns 100 km (62 mi) away from ground zero. A shock wave was observed in the air at Dikson settlement 700 kilometres (430 mi) away; windowpanes were partially broken to distances of 900 kilometres (560 mi). Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland. The seismic shock created by the detonation was measurable even on its third passage around the Earth.[8] Its seismic body wave magnitude was about 5 to 5.25.[7] The energy yield was around 7.1 on the Richter scale but, since the bomb was detonated in air rather than underground, most of the energy was not converted to seismic waves.
Now, as a conservative estimate, let's use 9x as a multiplier to these factors. In the case of Severny, which was utterly destroyed and being 55km away from the blast? That's 495km away.
The heat from such an impact could likely cause 3rd degree burns 900km away from ground zero. And I'd like to point this out:
Quote:
Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland.
Using conservative estimates, IE measuring closest distances of Norway/Finland to the location of the bomb test location is roughly 1500km. I won't even try to extrapolate the result of the atmospheric focusing ranges on something like this.

Also note that they claim its impact on the richter scale was 5.0 to 5.25, but could have been as high as 7.1 had it be detonated underground. Which an asteroid of that magnitude hitting our planet would certainly count.

Now, of course, we haven't considered the ejected, vaporized matter of the earth and the asteroid itself and how it would react in the atmosphere.

Yet you doubt there will be global weather effects?

Perhaps not the the scale of what caused the extinction of the dinosaurs, but yeah, I think it is very safe to say that the weather will be effected on the global scale to some degree...
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post #104 of 110
Quote:
Originally Posted by Oscuro View Post
Yet you doubt there will be global weather effects?

Perhaps not the the scale of what caused the extinction of the dinosaurs, but yeah, I think it is very safe to say that the weather will be effected on the global scale to some degree...
I was going on that scale, as in no blacking out the sun, etc.

But, I failed to take into account that the bomb was detonated in the air You're right, my assumptions were very downplayed.

Siberia is a big place though, if it lands there, we're much better off than it landing anywhere else.
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post #105 of 110
It would be cool if it hit the moon and we could see it.
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post #106 of 110
NASA better be right about the non-collision thing.
    
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post #107 of 110
Quote:
Originally Posted by andrews2547 View Post
I heard all communication services will be shut off for 3 minutes as well. By communication services I mean the internet, land line phones and mobile phone services. Shouting at someone far away will still be usable when this happens though.
IPV6 has to be in place for internet kill switch and everybody who has switched to IPV6 has had their network hacked to all bejeezus. Banks are fracked.
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post #108 of 110
Quote:
Originally Posted by Nephrahim View Post
No asteroid is within feet of hitting earth. Not even within thousands of feet.

Moreover, all asteroids (At least the ones that are moving) all orbit the sun, as there is no other source of gravity even remotely close to the sun.

As to the last, I should not have spoken authoritatively, because dark matter COULD be anything, but most forms of mass that we know of do reflect light, even if they don't produce it (With the exception of black holes I suppose.) So yes, if there was "Dark matter" close to us, it is very possible the sun would illuminate it.
My use of the term "feet" is more of a dramatic way to describe that these asteroids are freakin' coming close to our planet.

One thing is certain for what we think of as dark matter. It emits no light visible or otherwise.

My point is this: We find dark matter by observing how it effects the trajectory of large bodies in space. So dark matter has a gravitational effect on large bodies. But we find that effect after that large body has been thrown off because we can't detect this dark matter.

Thus, the possibility exists that an asteroid will be thrown off its trajectory by this dark matter that we can't detect until after we observe its effect on the asteroid.

What is your point? Why are you even arguing about this if you say you are not speaking authoritatively? It sounded like you were some dark matter physicist genius saying, "that's not how dark matter works".
Edited by homestyle - 11/8/11 at 10:37am
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post #109 of 110
Quote:
Originally Posted by trulsrohk View Post
Should one of these ever be on a collision course, we already have the blueprints.

Land Bruce Willis on it with some explosives


Or we could have Chuck Norris roundhouse kick it back into space.
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post #110 of 110
fly-by time to be 6:28PM EST according to this report 4 hours ago.

http://www.foxnews.com/scitech/2011/...y-earth-today/

exciting stuff really if one takes the time to really think about how close it is.
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