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Based on what you know about the possibilities of communicating with distant civilizations, select all of the correct statements from the following list. Even radio messages would take years to travel between planetary systems. Since we have not yet been in contact, most astronomers think that it is no longer a reasonable possibility that other civilizations exist in our galaxy, and that SETI should be abandoned. Broadcasting messages in mathematical patterns is a way for radio signals sent by technological civilizations to be distinguished from signals from natural sources. The limiting factor in communicating with other technological civilizations may be the lifetime of such civilizations. The "water hole" is one specific radio wavelength where radio signals that are technological in origin are likely to be found. The SETI program concentrates its searches on this water hole. Because of the distances involved, interstellar travel is not a viable means of communication.

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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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