From: usenet@noemailaddress.co.uk.retro.com   
      
   On 15 Dec 2003 03:12:17 -0800, fillup@herspace.com (P. Ussyliquor)   
   wrote:   
      
   >What is the most primative propulsion system that could be used in a   
   >spaceship to travel between asteroids? I am specifically thinking of   
   >one that could refuel on asteroids.   
   >   
   The simplest I can think of runs like this:-   
      
   1. Take a rock out there in space and sit on it.   
   2. Pick up pebbles off the rock.   
   3. Throw them away (opposite to the direction you want to go).   
      
   It won't exactly be fast, but it is propulsion.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)