Martin Posted June 14, 2006 Share Posted June 14, 2006 rather small meteor impact on moon caught in video http://science.nasa.gov/headlines/y2006/13jun_lunarsporadic.htm?list45222 4 tons of TNT brief picture of the fireball looks tiny on the face of the moon Link to comment Share on other sites More sharing options...
Externet Posted June 14, 2006 Share Posted June 14, 2006 And... how does a fireball happen when there is no oxigen? Link to comment Share on other sites More sharing options...
Martin Posted June 14, 2006 Author Share Posted June 14, 2006 And... how does a fireball happen when there is no oxigen? rock vaporizes, some even ionizes-----so much energy delivered to relatively small amount of material Link to comment Share on other sites More sharing options...
insane_alien Posted June 14, 2006 Share Posted June 14, 2006 well you would describe the sun as a fire ball but theres no oxygen(well, a little) there either. a flame is just ionized gas anyways. Link to comment Share on other sites More sharing options...
ecoli Posted June 15, 2006 Share Posted June 15, 2006 very cool, thanks for sharing. Link to comment Share on other sites More sharing options...
dirtyamerica Posted June 15, 2006 Share Posted June 15, 2006 And... how does a fireball happen when there is no oxigen? Nothing is "burning". The impact is emitting energy, some of it in the form of visible light. Link to comment Share on other sites More sharing options...
herpguy Posted June 18, 2006 Share Posted June 18, 2006 Why did the fireball dissapear in just 4/10 of a second? Shouldn't it last a few seconds, even if it was only 10 inches wide? Link to comment Share on other sites More sharing options...
insane_alien Posted June 18, 2006 Share Posted June 18, 2006 Why did the fireball dissapear in just 4/10 of a second? Shouldn't it last a few seconds, even if it was only 10 inches wide? well, expanding gasses drop in temperature extremely rapidly. the moon has an atmospheric pressure of zero(practically), the pressure of the fireball is probably a few tens of atmospheres, its a few thousand K, its gonna expand FAST and hence cool to the point where the emissions are invisible. and any emissions in the visible spectrum will be to spread out and dim to be visible from earth. Link to comment Share on other sites More sharing options...
herpguy Posted June 18, 2006 Share Posted June 18, 2006 well, expanding gasses drop in temperature extremely rapidly. the moon has an atmospheric pressure of zero(practically), the pressure of the fireball is probably a few tens of atmospheres, its a few thousand K, its gonna expand FAST and hence cool to the point where the emissions are invisible. and any emissions in the visible spectrum will be to spread out and dim to be visible from earth. So if a meteorite of that size somehow slid through the atmosophere without burning up would the fireball last longer? Link to comment Share on other sites More sharing options...
insane_alien Posted June 18, 2006 Share Posted June 18, 2006 technically, yes. but the difference would be practably imperceptible. Link to comment Share on other sites More sharing options...
silkworm Posted June 18, 2006 Share Posted June 18, 2006 AHHHH! I was looking for this video. I should have just came here. Is this the only one of it's kind you're aware of, Martin? Link to comment Share on other sites More sharing options...
Martin Posted June 18, 2006 Author Share Posted June 18, 2006 Is this the only one of it's kind you're aware of' date=' Martin?[/quote'] only one I know of, silkworm find any other home movies of a meteor fireball on the moon, let me know regards Link to comment Share on other sites More sharing options...
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