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quote:Originally posted by neilep...thanks guys, of course !!..it's obvious now...and I was missing it !!.....But maybe in the future when we've sorted all that braking-against-fuel-effficiency stuff out, will,we then be able to come to a halt and just drop in.......thanks again.Men are the same as women.... just inside out !!
quote:Originally posted by AllisonThe fuel used to power the space shuttle is super-cooled liquid hydrogen, rather than some kind of petroleum-based fuel. The hydrogen is mixed with liquid oxygen inside the engines (the reaction provides the energy required to blast off), and the clouds of "smoke" that appear when the shuttle blasts of is actually water vapor--incredibly dramatic water vapor, but much less harmful than exhaust from a tail pipe.
quote:However, Boeing's new Delta IV rocket has an all cryogenic hydrogen-oxygen propulsion system.