Eight signals: as scientists prepare for a meeting with "guests from space"

In the sky – trillion stars. Many are convinced that Earth cannot be the only manned planet. Probably, through couple of hundreds years we should accept delegates of an intergalactic meeting. But how they will look? Nobody knows the answer to this question. Even the usual stone can appear not a stone, and a silicon form of life. How scientists prepare for a meeting with aliens? And why we can not recognize guests from space, having faced them? The Science and Equipment program tells about it with Mikhail Borzenkov on REN TV. The space ship scout In Solar system...