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Coffee House => Coffee House Boards => CH / Science and Technology => Topic started by: blobrana on April 08, 2004, 12:03:05 PM
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Hehe,
Those crazy scientists from the University of Arizona have developed a handy calculator that you can use to determine your fate in the event of an asteroid impact.
It calculates the blast, depth of ejecta, and the force of the air blast at a distance from ground zero. Now you can see if you'll be safe from the devastation of an asteroid strike, or if you'll need to hop in your car and drive... far.
calculator... (http://www.lpl.arizona.edu/impacteffects)
(tip, try a speed of 30,000 km/sec)
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Your position was inside the transient crater and ejected upon impact
My bottom hurts! :-D
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Make your projectile dense, large and fast enough and you get a transient crater larger than the earth :-D
You'd think they'd cap the velocity - you can enter values > c ;-)
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Karlos wrote:
Make your projectile dense, large and fast enough and you get a transient crater larger than the earth :-D
You'd think they'd cap the velocity - you can enter values > c ;-)
hahahaha, call themselves scientists! Perhaps they are accounting for the possiblity of an asteroid impacting with the earth before it reached us...
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Aye, I managed to get a fireball so big it would be over your horizon even 20000km away. Or on the opposite side of the earth, to be a bit more precise :-D
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I went to the other side of the scale, standing 5 metres away from a 5cm rock hitting at 500 m/hour - and I got second degree burns? :crazy:
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:LOL:
:lol:
[sry, mustn`t laugh at others misfortune]
Anyway, i`m trying to get a friction burn...
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blobrana wrote:
Anyway, i`m trying to get a friction burn...
I'm sure I can help there!!!
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:lol:
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KennyR wrote:
I went to the other side of the scale, standing 5 metres away from a 5cm rock hitting at 500 m/hour - and I got second degree burns? :crazy:
Cool. I did try the micro end of the scale too, but I couldn't get anything so small to traverse the atmosphere. Maybe I had the velocity too high :-D
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now you just have to make a pda format :-)
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Hi
On Sept 27, 2003, in Orissa, India, 3 people were hospitalised because of meteors that fall from the sky.
20 peoples were injured. Search on google: +Meteor +Orissa
http://www.google.com
In USA, a car was destroyed by another meteor. Another meteor fall through the roof of a house, bounce around in the living room and destroy a TV set.
Meteors List (http://www.branchmeteorites.com/metstruck.html)
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Hum,
Nice link there...
And in the news...
Near Earth Object Observation Program experts have told the Senate subcommittee on Science, Technology and Space, that they are on schedule to finding everything bigger than 1 kilometer (0.62 mile) in diameter that might approach the planet (that`s city killers).
"The survey officially started in 1998 and to date more than 700 objects of an estimated population of about 1,100 have been discovered, so the effort is now believed to be over 70 percent complete and well on the way to meeting its objective by 2008."
So things don`t looks so bleak... :-)
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...and then suddenly a 999m rock destroys London. ;-)
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I wonder, just out of curiosity, if you had a material that would heat without shattering and ablate in a controlled fashion as it traversed the atmosphere, what sort of initial size/velocity a chunk of it would have to be to land as a sufficiently aerobraked harmless pebble...
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Or what about a chunk of degenerate iron from a stellar core? Melts at 120,000K, weighs a tonne per cubic centimetre...or more. That would make a nice little hole, even a pebble of it.
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@Kenny
Dude, you solved the martian terraforming problem :-D
We should hit mars with a steady stream of sharpened degenerate iron projectiles that will sink to the core and increase its mass enough to give it a decent gravitational pull :-P
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Im sure we mused over this material before. I really don't think you could have a pebble sized chunk of it. It probably only exists when there is enough pressure to form it and requires some sort of critical mass to continue existing in absence of the forces that created it. The internuclear repulsion would easily overcome gravity unless you had a stonking big hunk of the stuff.
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@Karlos
Hum,
How about dark matter?
Most of this exist as a `halo` around our galaxy but some would have collected within large gravitational objects (er, like stars, or our sun)...
They wouldn`t really react with anything there, being WIMPS*, but would interact gravitationally...
If you could collect enough wimps an inject them into the Martian core, then you would increase the gravity of Mars...
[WIMP = weakly interactive massive particle]
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Blobrana wrote:
If you could collect enough wimps an inject them into the Martian core, then you would increase the gravity of Mars...
But how would you hold them in, if they go straight through normal baryonic matter? ;-)
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Doh!
Oh !
Er, by creating a small black-hole (bigger gravitational well) and `fishing` for them in the sun...?
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KennyR wrote:
Blobrana wrote:
If you could collect enough wimps an inject them into the Martian core, then you would increase the gravity of Mars...
But how would you hold them in, if they go straight through normal baryonic matter? ;-)
Surely they'd just oscillate about the common centre of gravity and gradually come to rest at the centre, right?
I mean, you plop into mars at one point, it sinks trhough, accelerating towards the core. Once it hits the core its moving at its maximum speed and as if flies out the other side it will be decelerating again.
No matter how weakly they interact I doubt they'd travel trhrough an entire planetary mass without some kinetic energy lost to other processes somewhere.
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Karlos wrote:
Surely they'd just oscillate about the common centre of gravity and gradually come to rest at the centre, right?
Sure they would. Except the common centre of gravity would be the Sun or Jupiter, not Mars. :)
No matter how weakly they interact I doubt they'd travel trhrough an entire planetary mass without some kinetic energy lost to other processes somewhere.
Why not? A neutrino can travel through 35 light years of dense matter and not interact, and WIMPs interact even less.
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I thought we were working on the assumption we'd fished them out of the sun?
Or you are implying theyd just drift all the way back to the sun as the solar systems centre of mass?
Degenerate iron shells it is then :lol:
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Yep,
we've fished them out of the sun.
And they would orbit around with mars...
[yes, this solar system is unstable and eventually they , and mars, would be swallowed by the sun or flung out into deep space]
the only problem is how to get rid of the black-hole... (evaporating only leave nothing, me thinks)
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Aye, you sure don't wanna leave a black hole lying unattended in the sun's vicinity.
Ever read the Night's Dawn Trilogy? A doomsday superweapon called "the alchemist" is in the second book, based on the principal of creating an intense gravity well sufficent to create an event horizon, or just crush surrounding matter to neutronium depending on the setting. When it does get used (albeit fired into a poor unsuspecting gas giant), the imagery described is awesome :-)
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@Karlos
No never read the book...
hum, the warping of space , as an alternative to using a black hole (messy), would be a better solution....
Er, now all we have to do is discover 25th century physics...or perhaps some alien artifact... :-)
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blobrana wrote:
@Karlos
No never read the book...
Aww. Your'e missing out. I read the whole trilogy a few times and enjoyed it just as much each time around. All the people I know who read it enjoyed it, I'm sure you would too :-D
hum, the warping of space , as an alternative to using a black hole (messy), would be a better solution....
Plenty of that goes on too. Living, organic, sentient spacecraft (voidhawks and blackhawks) warp space to create wormholes for travelling, whereas conventional (that is technological) spacecraft create a massive space warp around their hulls to squeeze themselves out of the universe at one point and back into it somewhere else.
Er, now all we have to do is discover 25th century physics...or perhaps some alien artifact... :-)
Well, the story begins in 2583 or so in a universe where mankind has populated some 800 star systems, but the main story starts in 2611 or something.
Read it, you know you want to :-D
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Read it, you know you want to
But does she still want some friction burns?
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Wrap yourself in velcro and lunge at her some dark night.