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/
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.
Video of explosion locations at the link: http://www.wired.com/2014/04/giant-asteroid-impacts/
Big asteroids hit Earth far more than we're told, say astronautsThough 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.
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.

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