Nasa shuttle flights

Just out of curiosity,when the shuttle blasts off and it creates all that thrust/smoke,do nasa just let it disperse or do they have a method of controling it?, what about pollution etc.
21:38 Wed 17th Aug 2011
 
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I would imagine that in the grand scheme of things the pollution would be quite minimal and very localised.
isn't it steam rather than dust or smoke?
Question Author
Dont know if it is gas,steam,heat,smoke,but it creates a lot of it!.
It's steam. They pour water into the ground vents for the jet thrust
The Shuttle main engines are pretty pollution-free - liquid hydrogen and liquid oxygen giving rise to water/steam as reaction mass. The solid rocket booterss are entirely another matter. They produce HCl and various oxide of nitrogen and are known destroyers of ozone.
I hope everyone has had the opportunity to see this:

http://shortarmguy.bl...tle-launch-photo.html
The solid boosters burn aluminium with an aluminium perchlorate oxidiser.

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