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Q&A Optimal wavelength for an interstellar communication laser

The Precursors are looking for recruits for their interstellar army. Obviously they don't need primitives who can only just bang rocks together, so they've set up a test - a beacon, lying above the...

2 answers  ·  posted 7y ago by Werrf‭  ·  last activity 7y ago by Werrf‭

Question space physics