From: ariek@attglobal3.14159265358979323846.net.retro.com   
      
   Hello!   
      
   Reading various bits of info about Mars rovers on various sites   
   I haven't noticed (or missed?) any info about their life expectancy   
   on the Mars surface.   
      
   I'l curious to know what limits their life? Do they consume anything   
   like batteries charge-discharge cycles?   
      
   Is their ability to recharge batteries limited by the Mratian seasons?   
   In how long time the dust will cover the solar panels to such extent   
   that batteries could no longer be charged? Can these panels be rotated   
   briefly to vertical to allow the dust to fall off?   
      
   Is there any lubrication of the moving parts (especially wheels) that   
   is consumed over time?   
      
   What is the expected time for the dust to clog various moving parts?   
      
   Anything else?   
      
   TIA,   
   ******************************************************************************   
   *   Arie Kazachin, Israel, e-mail: ariek@attglobal3.14159265358979323846.net *   
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