by iamlucky13 » Tue Nov 20, 2007 8:02 pm
Chris Peterson wrote:It is unknown what kind of object was involved. You underestimate the amount of energy released when an object breaks apart in the atmosphere at a hypersonic speed. The Tunkuska event could very easily have been the product of a stony meteoroid. Even the "dirty snowball" model of comets has been challenged lately, as it increasingly appears that comets may be more like "snowy dirtballs".
From what I've read lately about comet and meteor research, it's begun to sound to me like there's probably a roughly continuous spectrum of objects from stony asteroid to dirty snowballs. Case-in-point, carbonaceous chondrites are a type of meteorite with a high concentration of water...essentially "snowy dirtballs."
And yes, even dense objects can explode with great force if they break apart. Basically as they disintegrate their surface area to mass ratio skyrockets, and the resulting air drag converts nearly all of their kinetic energy (which can be quite substantial) to heat in a fraction of a second. This doesn't even have to vaporize the meteor material (water, rock, metal, etc), although that does happen, because the air still heats and expands explosively.
The DoD was actually researching the possibility of using this as an area effects weapon. The idea was to accellerate a tungsten rod to hypersonic velocity, then deliberately disintegrate it with a small explosive charge. They're a variation of the "rods from God" bunker buster concept, where instead of bursting it, you using it as a penetrator.
FieryIce, I haven't had a chance to read the links yet, but what was it we missed?
[quote="Chris Peterson"]It is unknown what kind of object was involved. You underestimate the amount of energy released when an object breaks apart in the atmosphere at a hypersonic speed. The Tunkuska event could very easily have been the product of a stony meteoroid. Even the "dirty snowball" model of comets has been challenged lately, as it increasingly appears that comets may be more like "snowy dirtballs".[/quote]
From what I've read lately about comet and meteor research, it's begun to sound to me like there's probably a roughly continuous spectrum of objects from stony asteroid to dirty snowballs. Case-in-point, carbonaceous chondrites are a type of meteorite with a high concentration of water...essentially "snowy dirtballs."
And yes, even dense objects can explode with great force if they break apart. Basically as they disintegrate their surface area to mass ratio skyrockets, and the resulting air drag converts nearly all of their kinetic energy (which can be quite substantial) to heat in a fraction of a second. This doesn't even have to vaporize the meteor material (water, rock, metal, etc), although that does happen, because the air still heats and expands explosively.
The DoD was actually researching the possibility of using this as an area effects weapon. The idea was to accellerate a tungsten rod to hypersonic velocity, then deliberately disintegrate it with a small explosive charge. They're a variation of the "rods from God" bunker buster concept, where instead of bursting it, you using it as a penetrator.
FieryIce, I haven't had a chance to read the links yet, but what was it we missed?