From: wugi@brol.invalid   
      
   Op 15/01/2024 om 22:10 schreef Stefan Ram:   
   > What would happen if a penny with a mass of 0.003 kg and a speed of   
   >   
   > 0.99999999999999999999999999999999999999 c   
   >   
   >    from outer space would hit the earth (being directed at its center)?   
   >   
   >   
   > [[Mod. note --   
   > There are 38 9's in that speed, i.e., the speed is (1 - 1e-38)*c.   
   > That implies a Lorentz gamma factor of (1 - v^2/c^2)^(-1/2) = 7e18,   
   > so the penny's total relativistic energy is gamma*m*c^2 = 2e33 Joules.   
   > That's rather a lot of energy. :)  In fact, it's about 8 times the   
   > Earth's gravitational binding energy (2.5e32 Joules according to the   
   > all-knowing Wikipedia).   
   >   
   > So, the tricky question is, how much of the penny's energy would go   
   > into disrupting the Earth, versus how much would go into kinetic energy   
   > of whatever came out the other side?   
   >   
   > And finally, I'll note that (IMHO not superb, but still an enjoyable read)   
   > the 1993 science-fiction novel "Flying to Valhalla",  by Charles Pellegrino,   
   > is based on a similar question.   
   > -- jt]]   
      
   Wouldn't it pass almost unnoticed through the Earth? The reaction time   
   with whatever obstacles it encounters would exceed largely its time of   
   passing by, so there would be hardly "explosive information" passed on   
   to them, or would there?   
      
   --   
   guido wugi   
      
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