How many Types of Aliens are there?

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Site Mechanic
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This I have never understood really. Surely there cant be that many.

I have heard of Nordics, and of course the Greys.

I'm sure some are just made up.

 
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Overall, we find that, in the most limited case, which we describe as the Strong Copernican Astrobiological limit, that there should be a minimum of 36(−32+175) communicating civilizations in the Galaxy today, assuming the average life span of these civilizations is 100 yr. The nearest of these would be at a maximum distance given by 17,000(−10,000+33,600) lt-yr, making communication or even detection of these systems nearly impossible with present technology.

- That suggests the likelihood of 36 different alien planets.

But wiki does not list many variations:

  • Greys
  • Hopkinsville Goblin
  • Little Green Men
  • Nordic
etc.

 
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