Alien Neighbors - Discovery Channel
If we are not alone, who or what else out there? Is anybody listening? Is physical travel from one star system to another possible?
Our technology is not sufficient to detect any intelligent life form beyond hundred-millions light years. There are over 125 billion galaxies and we may never catch any sign.
If there is a life, how will it develop? Will the mechanics of evolution be similar on the Earth?
Astronomers and scientists like Richard Dawkins explain their arguments on extraterrestrials. (www.youtube.com)