(Before It's News)
The source asteroid for robotic refining and constructions had up on two opposite pole towers microgridded communications cubes. The faces of such cubes had microgridded complex molecular sensors/senders able to sense light wave portions reaching them, or to send out properly timed light wave portions which would combine to produce light wave communications beamed to possibly several directions.
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Source:
http://www.prophet666.com/2013/12/microgridded-communications-in-space.html