The Search for Extraterrestrial Intelligence by Carl Sagan

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http://www.FreeScienceLectures.com To reach other intelligences our technology must reach beyond interplanetary distances it has to go interstellar distances. The largest radio radar telescope on the planet Earth - Arecibo radio telescope - is located in Arecibo, Puerto Rico. It is so powerful it could communicate with an identical one 15 thousand light years away. Half-way to center of Milky Way galaxy. It was used to send a message to a star cluster M15. But is there anyone out there to talk to? How far away is the nearest civilization capable of communicating with a radio telescope? If the galaxies are distributed randomly, the nearest one should be 200 light years away. How would we know we are receiving a message from intelligent life form? Transmitting civilization could make it very easy for us if they wished. If one day we found a signal which was methodical series of pulses then we would conclude that someone is saying hello. For example the signal could be all the prime moins