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Q&A How to make interplanetary communication infrastructure for aliens of Earth without knowledge of humans?

Plenty of aliens from various galaxies have managed to land on Earth without getting tracked on Radars or satellites. For now, as I want my story to stay undisclosed, please assume that aliens have...

4 answers  ·  posted 8y ago by Karan Desai‭  ·  last activity 7y ago by Karan Desai‭

Question reality-check planets aliens