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Sagot :
Radio transmissions between planetary systems take many years to complete. Since the closest star is farther away, radio waves take almost 4 light years to travel at the speed of light.
Broadcast message in mathematical pattern is way for radio waves sent by technological civilization. Earlier we send pictures and sounds message into space but it was not responded. But by broadcast formula of chemicals other civilization could reconstruct and find life on earth.
The limiting factor in communicating with other technological civilization may be lifetime of such civilization. According to Drake's equation and Carl Sagan it was stated that lifetime of other civilization in space for communicating is depends upon the lifetime which is the determining factor. The water hole is one specific radio wavelength where radio signals technological in origin is found. Water hole is used in radio astronomy and used for communicating with extraterrestrial intelligence. Because of distance involved interstellar travel is not viable means for communication.
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