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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 numbers 2, 3, 5, 7, 11, 13, 17, ... which no natural source of radiation could transmit.
Our technology is now fully adequate for this challenge.
Why havent we yet discovered any and why hasn't they visited us? One answer is that maybe we are first? Some civilization has to be first.
Or maybe they have destroyed themselved. Or possibly they are already with us, just hiding.
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