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Q&A From how far away can it be deduced that there is sentient life on earth?

The Aargh are a humanoid alien race a couple solar systems away. Their home planet is quite earth-like (oxygen atmosphere, a lot of water, traditional organic chemistry even if a few proteins are d...

8 answers  ·  posted 5y ago by subrunner‭  ·  last activity 5y ago by subrunner‭

Question aliens