The Universe is very big, and the possibility that we humans are alone in space is logically and scientifically unacceptable. Solar-type stars, whose lifetime can reach up to five billion years, are numerous according to astronomical statistics and can host planets, some of which have already been discovered and placed in the habitability zone where the phenomenon of life can be born and grow. The very long duration of nuclear fuel that is burning in these stars can give enough time for a civilization to develop technologically during one or more evolutionary cycles unless nuclear self-destruction occurs. The laws of physics are the same everywhere in the universe. Therefore, there are good reasons to suppose that their discovery
follows very similar paths as ours. In such a way, using, at least in the first phase, electromagnetic waves to communicate, would be a natural process. Assuming that such atechnological evolution reaches much higher peaks over a reasonably long time, exploring the universe directly
would be natural as well. Science is presently searching for both possibilities.
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