In a message dated Fri, 3 Nov 2000 12:28:12 AM Eastern Standard Time, "Dan 
Minette" <[EMAIL PROTECTED]> writes:

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As our Zimmy has mentioned in another post, I was discussing manned space 
exploration, not space exploration in general.  

Dan - you can probably explain better than I why it is so costly to lug a 
human environment and the equipment to get the humans back at the end of the 
trip. has to do with the fuel needed to carry the fuel and stuff back. 
As far as I remember it you start having to double the fuel requirements 
every time you add 1 or 2% to the payload.

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