On Wed, 20 Feb 2008 15:25:20 GMT, Larry Dighera wrote:

Hydrazine doesn't seem like it would present too large of a problem if
it burned in the upper atmosphere. Does anyone know just how much
hydrazine is involved?

Half a ton. Probably frozen solid, but without telemetry, there's no way to
tell.

Is the hazard more from a tank full of the stuff making it to the
surface intact?

I'd suspect the problem is if it makes it intact. The Wikipedia article refers
to its use in the Me-163 Komet of WWII. The plane occasionally *dissolved*
pilots during accidents....

Ron Wanttaja