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Earth hit by 26 nuke-size asteroids since 2000. (1 Viewer)

Sarnoff

Footballguy
Just FYI, we get hit, on average, by one Hiroshima-sized blast every year.

Video of explosion locations at the link: http://www.wired.com/2014/04/giant-asteroid-impacts/

Though dinosaur-killing impacts are rare, large asteroids routinely hit the Earth. In the visualization above, you can see the location of 26 space rocks that slammed into our planet between 2000 and 2013, each releasing energy equivalent to that of our most powerful nuclear weapons.

The video comes from the B612 Foundation, an organization that wants to build and launch a telescope that would spot civilization-ending asteroids to give humans a heads up in trying to deflect them. To figure out where asteroids were hitting our planet, B612 used data from a worldwide network of instruments that detect infrasound, low-frequency sound waves traveling through the atmosphere. Such measurements have been used since the 1950s to detect nuclear bomb explosions and can also pick up the tremendous burst of a bolide tearing through our atmosphere.

The Nuclear Test Ban Treaty Organization, which operates the network, recently released the location of these asteroid strikes, which gives scientists another datapoint in understanding the frequency with which these events happen. In recent years, there has been a growing consensus that the Earth gets hit by enormous space rocks more often than we previously thought. The 26 strikes in the video above were each between 1 kiloton and 1.6 megatons. For comparison, the atomic bomb dropped on Hiroshima exploded with an energy of 16 kilotons, and the U.S.’s most powerful nuclear weapon, the B83 bomb, has a yield of up to 1.2 megatons. Of course, comparing asteroids to nuclear bombs is a bit misleading; asteroids generate a moving shockwave that can cause far more destruction than the rock itself.

Just to dial back your ever-increasing sense of anxiety here–asteroid impacts are almost always harmless. A Hiroshima-scale asteroid explosion happens in our atmosphere on average once a year and yet we’re all still here. Moreover, asteroids can’t aim themselves at populated centers. Most of the Earth’s surface is water and even a large percentage of land is fairly uninhabited by humans. Though B612′s Ed Lu mentions in the video that only “blind luck” is preventing a catastrophic city-size space rock from killing us, keep in mind that blind luck has actually been serving us fairly well so far.

Still, the well-publicized explosion over the city of Chelyabinsk in Russia last year serves as a reminder that these events can be quite destructive. It would do us good to be on the lookout for them.
Big asteroids hit Earth far more than we're told, say astronauts
To, well, celebrate Earth Day, April 22, three former astronauts will claim they have evidence that remote parts of the Earth have endured 3 to 10 times more large-scale asteroid strikes than has been revealed.

Are asteroids a little passé?

We're always told they're flying around us and over us. It seems a touch more rare that they smash into, say, Manhattan, or Peoria, Ill.

Still, we make movies and video games about it, as if it could happen anytime.

Now along come three former astronauts to offer: "Hey, this could happen anytime."

As part of a celebration of Earth Day, which falls on April 22, Ed Lu, Tom Jones, and Bill Anders, all veterans of space travel, are to give a presentation to scare us out of our complacent wits.

As Phys.org reports, the B612 Foundation will present data from a nuclear weapons warning network that shows -- at least to members of the group -- that large asteroids strike the Earth 3 to 10 times more than publicly revealed.

A quote released to entice people to the presentation -- to be held in Seattle -- is less than reassuring: "The only thing preventing a catastrophe from a 'city-killer' sized asteroid is blind luck."

Personally, I've been rather fond of blind luck over the years.

However, the foundation, led by Lu, offered this in an advance press release: "This network has detected 26 multi-kiloton explosions since 2001, all of which are due to asteroid impacts. It shows that asteroid impacts are NOT rare -- but actually 3-10 times more common than we previously thought."

I confess that this information confuses me.

It would suggest that big, lumbering asteroids have hit us twice a year since 2001. This creates far more fear than a warning issued last year that said we should expect an asteroid strike every decade or two.

Naturally, Lu and his foundation are trying to raise money to build a telescope called the Sentinel, which might offer better warnings of asteroids about to hit us.

Scaring people isn't a bad way to raise money. But surely it's better to make yet another blockbuster movie starring a debonair former astronaut -- played by George Clooney or Sandra Bullock.

"Grave Situation," coming to a movie theater near you.
:scared:

 
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Only a question of when not if one of these barrels into a good size city.
It sounds like most of these blow up in the atmosphere and aren't really even noticeable on the ground. If you watch the video in the link a couple of them were actually in urban areas and if an asteroid had blown those cities up in recent years I think we would have heard about it.

 
Only a question of when not if one of these barrels into a good size city.
Well, sure.

But if we get one big one that actually reaches the surface each century you could go an awful lot of centuries before the random location was on top a big city.

 
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great impact damage but without that pesky radiation aftertaste!

Question for smart people: isn't much of the impact energy absorbed by the ground in these big strikes? so if one hit Manhattan, that damage wouldn't be comparable to a multi-kt or a mt nuke.

 
I wouldn't worry about getting hit by an asteroid in a city. Quite frankly, I'd be more concerned about a large rock hitting the ocean and causing a tidal event, if such a thing is possible. I'll admit, I was skeptical about that number, but once the list started showing impact zones in the ocean, it made more sense.

 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?

 
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great impact damage but without that pesky radiation aftertaste!

Question for smart people: isn't much of the impact energy absorbed by the ground in these big strikes? so if one hit Manhattan, that damage wouldn't be comparable to a multi-kt or a mt nuke.
If a piece reaches the ground it is carrying a tremendous amount of kinetic energy. So yes a large hit would be devastating and would look like a nuclear blast just minus the radiation.

 
Note to self: when conducting secret nuclear weapons tests in violation of international law, make sure to detonate the warhead in the upper atmosphere far from land, where it will be mistaken for an asteroid strike.

 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.

 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.
Odds of being hit by lightning? 1 in 700k. Still happens every year. Not saying one should spend their days consumed by fear of an asteroid hitting their town but low odds are not the same as no chance.

 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.
Odds of being hit by lightning? 1 in 700k. Still happens every year. Not saying one should spend their days consumed by fear of an asteroid hitting their town but low odds are not the same as no chance.
The point above by Kal El about the tidal wave is a good one.

 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.
Odds of being hit by lightning? 1 in 700k. Still happens every year. Not saying one should spend their days consumed by fear of an asteroid hitting their town but low odds are not the same as no chance.
The point above by Kal El about the tidal wave is a good one.
True.

 
great impact damage but without that pesky radiation aftertaste!

Question for smart people: isn't much of the impact energy absorbed by the ground in these big strikes? so if one hit Manhattan, that damage wouldn't be comparable to a multi-kt or a mt nuke.
I'm not replying to this because I think I'm smart, but, yea, I would assume the major difference between this and a nuke is that nuke is detonated pretty high above the ground, as that is the most effective way to create the most amount of damage, whereas, in most cases, an explosion from a meteor would be from impact with some surface. Could be entirely wrong, though.
 
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.
Odds of being hit by lightning? 1 in 700k. Still happens every year. Not saying one should spend their days consumed by fear of an asteroid hitting their town but low odds are not the same as no chance.
The odds of one hitting within 100 square miles of you is 1 in 600 million.

 
captain_amazing said:
Apes with Guns said:
great impact damage but without that pesky radiation aftertaste!

Question for smart people: isn't much of the impact energy absorbed by the ground in these big strikes? so if one hit Manhattan, that damage wouldn't be comparable to a multi-kt or a mt nuke.
I'm not replying to this because I think I'm smart, but, yea, I would assume the major difference between this and a nuke is that nuke is detonated pretty high above the ground, as that is the most effective way to create the most amount of damage, whereas, in most cases, an explosion from a meteor would be from impact with some surface. Could be entirely wrong, though.
Most explode in the atmosphere, like Tunguska, but anything big enough to threaten us with extinction would be massive enough that at least some or all of it would hit the surface. Even if it hits an ocean, it will still impact the ocean bottom. The amount of kinetic energy these things have is almost unfathomable.
 
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Sand said:
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Prepare for the coming of Gozer (the Gozerian, the Destructor, Volguus Zildrohar, the Traveler and Lord of the Sebouillia.)

 
DiStefano said:
NCCommish said:
Sand said:
But what are we doing about interdimensional cross rips like the 1909 Tunguska Blast?
Fun fact: The Tunguska Event was actually in 1908.
"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet. Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years.

"From a scientific point of view, I think about Tunguska all the time," he admits. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night."

Hmmm...Once every 300 years, and urban areas are only 1% of the earth's surface...

I think I'll sleep well tonight.
Odds of being hit by lightning? 1 in 700k. Still happens every year. Not saying one should spend their days consumed by fear of an asteroid hitting their town but low odds are not the same as no chance.
The odds of one hitting within 100 square miles of you is 1 in 600 million.
The odds of winning the lottery on a single ticket are roughly 1 in 175 million. Still happens.

 
captain_amazing said:
Apes with Guns said:
great impact damage but without that pesky radiation aftertaste!

Question for smart people: isn't much of the impact energy absorbed by the ground in these big strikes? so if one hit Manhattan, that damage wouldn't be comparable to a multi-kt or a mt nuke.
I'm not replying to this because I think I'm smart, but, yea, I would assume the major difference between this and a nuke is that nuke is detonated pretty high above the ground, as that is the most effective way to create the most amount of damage, whereas, in most cases, an explosion from a meteor would be from impact with some surface. Could be entirely wrong, though.
Most explode in the atmosphere, like Tunguska, but anything big enough to threaten us with extinction would be massive enough that at least some or all of it would hit the surface. Even if it hits an ocean, it will still impact the ocean bottom. The amount of kinetic energy these things have is almost unfathomable.
but would it cause more earthquake damage than lateral damage?

i don't think i know what I'm trying to figure out here. sorry.

 
yeah, we cannot afford to spend money on space travel

we'll just hope bruce willis can save life on earth

 

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