From: jtem01@gmail.com   
      
   https://youtu.be/qHu7uFfxFXs?feature=shared   
      
   I've pointed this out many times, and of course you're going   
   to pretend that you thought of it but, it's easier to find   
   alien life on distant worlds than to find alien visitors to   
   the Earth.   
      
   Think about it. Well. Not you but to the hypothetical person   
   who can think....   
      
   If aliens are visiting us then the are, at a minimum, taking   
   some measures to keep themselves concealed.   
      
   "Plausible Deniability," at the extreme least.   
      
   But when it comes to distant worlds, we know of no way to   
   hide the evidence of life.   
      
   Our atmosphere is filled with the "Biosignatures" of life on   
   our planet. Heck, at this point you can add "Technosignatures,"   
   the signs of an industrial/post industrial civilization.   
      
   You may refer to these technosignatures as "Pollution" if you'd   
   like.   
      
   Anyway, by analyzing the light they can determine the composition   
   of a distant atmosphere, and they can look for the tell tale   
   signs of life or even industrialization.   
      
   Okay, now for the bad news:   
      
   The planet they're talking about, this "Strongest Evidence for   
   Life," is over 100 light years away... 120, as the story puts   
   it. And, if true, the story is totally wrong when it extrapolates   
   this find into the abundance of life, and certainly intelligent   
   life.   
      
   So 120 light years away... the galaxy is maybe a thousand times   
   bigger (estimates place it anywhere from 100 to 150 thousand   
   light years across)... so a thousand life bearing planets, on   
   average, or so it seems... and none what so ever that can travel   
   to even neighboring solar systems.   
      
   We can't. And the algae they think is on this distant world can't.   
      
      
      
      
   --   
   https://jtem.tumblr.com/tagged/The%20Book%20of%20JTEM/page/5   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)