XPost: sci.space.policy, sci.physics   
   From: invalid@invalid.com   
      
   On 6/1/2017 1:30 PM, Robert Clark wrote:   
   > NASA just announced a solar probe to travel quite close to the Sun,   
   > about 3.7 million miles from the solar surface:   
   >   
      
      
   > Spacecraft able to get this close to the Sun could potentially allow   
   > beamed interstellar propulsion. For a spacecraft of any size, you would   
   > need huge amounts of beamed power. Where to get it? If you make the beam   
   > be solar-powered then can just use space-borne mirrors to focus the Suns   
   > rays. But the mirror(s) would have to be impractically large if they   
   > were in Earth orbit.   
   >   
   > But what if we placed them close to the Sun? At the distance quoted of   
   > 3.7 million miles away from the Sun a mirror 1 km on a side could   
   > collect a terawatt worth of power.   
   >   
   > Note this could also be used for space solar power when beamed towards   
   > Earth.   
      
   nope, dispersion, orbatal speeds, pointing, power is less than   
   0.0000000000000001% of total, $$$, etc, etc.   
      
   >   
   >    Bob Clark   
   >   
      
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