re: How to save weight in a moon bound vehicle
Step one: get rid of the people.
I'm astounded that the Moon is not already crawling with remotely-operated vehicles. Given the current technology of communications and computers, building a real-time rugged rover with waldoes and 3-D camera interface would be a piece of cake. Sample returns? Color TV? How hard can it be? The slight signal delay (a few seconds) could be easily compensated for.
I want to see people on the Moon as much as anyone, but I think we are missing a valuable first step here.
