Mr_e wrote:
Is it pure hydrazine that is being used, or a hydrazine derivative? Regardless, the hype around it's toxicity is ridiculous. Yes, it is toxic, but it is also extremely volatile. If the fuel tank broke up during re-entry, you'd never see any of the hydrazine. Even if it didn't break up, the contamination would be localized. Due to the volatility, it would not pose a long-term threat to the environment. Basically, if it lands in your back yard, don't be an idiot by playing with the stuff.
In short, it's a cover-story. More likely reasons range from the classified data/tech previous mentioned here, to a political statement.
Interestingly enough, wikipedia says that "At least one human is known to have died from exposure to hydrazine hydrate." Only one?
Source:
http://en.wikipedia.org/wiki/Hydrazinederives above statement from
http://www.inchem.org/documents/ehc/ehc/ehc68.htm
One is too many topic
If that one person were a child, or someone unintentionally exposed to it, then that is still one too many.
Thank you for your information, Mr_e
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