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Asteroid impact question



 
 
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  #1  
Old March 23rd 13, 01:41 AM posted to sci.space.history
Fevric J. Glandules
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Posts: 181
Default Asteroid impact question

So now we all know that the next time you see an extremely bright
fireball, get away from the windows, and hide under the bed and
wait for the bang.

However it strikes me that what Chelyabinsk had was a 'glancing'
impact. A couple of hundred miles further out and it would have
just sailed past.

Which raises some questions:

If an asteroid hits the outer atmosphere, does the drag draw
it *in*, or does the pressure wave push it *out*?

Secondly, if the Chelyabinsk object had come in vertically, at
what height would it have exploded?

I'm guessing that for the first, drag wins. On the second,
that the thing was moving so fast that it would have been
near to or at ground level.
  #2  
Old March 24th 13, 06:04 PM posted to sci.space.history
Bob Haller
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Posts: 3,197
Default Asteroid impact question

On Mar 22, 8:41*pm, "Fevric J. Glandules"
wrote:
So now we all know that the next time you see an extremely bright
fireball, get away from the windows, and hide under the bed and
wait for the bang.

However it strikes me that what Chelyabinsk had was a 'glancing'
impact. *A couple of hundred miles further out and it would have
just sailed past.

Which raises some questions:

If an asteroid hits the outer atmosphere, does the drag draw
it *in*, or does the pressure wave push it *out*?

Secondly, if the Chelyabinsk object had come in vertically, at
what height would it have exploded?

I'm guessing that for the first, drag wins. *On the second,
that the thing was moving so fast that it would have been
near to or at ground level.


NBC news saturday reported another fairly large incoming that appears
to have fallen in the ocean, nasa said it was a asteroid....

interesting the rate of thes are up....
  #3  
Old March 25th 13, 12:02 AM posted to sci.space.history
Brad Guth[_3_]
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Posts: 15,175
Default Asteroid impact question

On Mar 24, 10:04*am, bob haller wrote:
On Mar 22, 8:41*pm, "Fevric J. Glandules"
wrote:









So now we all know that the next time you see an extremely bright
fireball, get away from the windows, and hide under the bed and
wait for the bang.


However it strikes me that what Chelyabinsk had was a 'glancing'
impact. *A couple of hundred miles further out and it would have
just sailed past.


Which raises some questions:


If an asteroid hits the outer atmosphere, does the drag draw
it *in*, or does the pressure wave push it *out*?


Secondly, if the Chelyabinsk object had come in vertically, at
what height would it have exploded?


I'm guessing that for the first, drag wins. *On the second,
that the thing was moving so fast that it would have been
near to or at ground level.


NBC news saturday reported another fairly large incoming that appears
to have fallen in the ocean, nasa said it was a asteroid....

interesting the rate of thes are up....


As long as the Sirius Oort clout is closing in, it's hardly
unexpected. Should eventually get up to one an hour, although that
probably isn't going to get that bad for at least another thousand
years.

In other words, we have lots of time to wait and see. If nothing
else, it's going to make folks a lot more religious, or at least
thanking their lucky stars each time the next one misses their home,
school or business.
 




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