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comment by Devac
Devac  ·  1877 days ago  ·  link  ·    ·  parent  ·  post: What If We Really Are Alone in the Universe?

It's "Where P_0 is power in the narrowest crossection of the beam ~ power of the source." Sorry, I didn't notice the cut.





user-inactivated  ·  1877 days ago  ·  link  ·  

No worries at all, thanks!

user-inactivated  ·  1877 days ago  ·  link  ·  
This comment has been deleted.