From: spam@merlyn.demon.co.uk   
      
   JRS:  In article , seen in   
   news:sci.space.science, Roger Stokes  posted at   
   Sat, 22 Nov 2003 06:26:54 :-   
      
   >The mass of Mars is about 6e23 Kg   
   >the deltaV (mars->jupiter) is about 10 km/sec   
   >   
   >Thus the energy needed to move Mars to Jupiter is around 3e31 joules. If   
   >this is done over 100 years the average power required is around 2e22 watts.   
   >If the current energy generation capability of the Earth is 1e13 watts (this   
   >is the bit I'm not sure of), and economic and power growth is constant and   
   >eternal at 4% per year (the philosophy of capitalism and the cancer cell),   
   >then by the year 2667 the human race may be willing to spend 1% of it's   
   >energy resources moving planets.   
      
      
   The Earth maintains ~300K receiving 2e17 W from the Sun.  If the earth   
   generates and uses 100 * 2e22 W locally, that's 1E7 times as much,   
   raising the Earth to ~17000K on a T^4 basis.   
      
   The Earth should use Solar power, not compete with it.   
      
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